Keisuke Kojima

Keisuke Kojima
  • Biography

    During his 8 years at the Central Research Laboratory, Mitsubishi Electric Corp. (Amagasaki, Japan), and 13 years AT&T/Lucent Bell Laboratories and other major US companies, Keisuke worked on R&D of semiconductor lasers and optical systems as a technical staff and later as a manager. At MERL he is currently working on simulations of optical devices and systems. He has more than 100 publications in journals and conference proceedings.

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  • Awards

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  • MERL Publications

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  • Other Publications

    •  Fischer, Martin C; Gupta, Gyaneshwar C; Wang, Leah L; Kojima, Keisuke; Mizuhara, Osamu; Swaminathan, Venkataraman, "FEC performance under optical power transient conditions", Photonics Technology Letters, IEEE, Vol. 15, No. 11, pp. 1654-1656, 2003.
      BibTeX
      • @Article{fischer2003fec,
      • author = {Fischer, Martin C and Gupta, Gyaneshwar C and Wang, Leah L and Kojima, Keisuke and Mizuhara, Osamu and Swaminathan, Venkataraman},
      • title = {FEC performance under optical power transient conditions},
      • journal = {Photonics Technology Letters, IEEE},
      • year = 2003,
      • volume = 15,
      • number = 11,
      • pages = {1654--1656},
      • publisher = {IEEE}
      • }
    •  Klotzkin, D; Kojima, K; Jordache, N; Chand, N; Kiely, P; Chien, M; Han, M; Michel, E; Ustin, S; Roycroft, S; others, "High-speed directly modulated Fabry-Perot and distributed-feedback spot-size-converted lasers suitable for passive alignment, unisolated operation, and uncooled environments up to 85C", Lightwave Technology, Journal of, Vol. 21, No. 1, pp. 69-78, 2003.
      BibTeX
      • @Article{klotzkin2003high,
      • author = {Klotzkin, D and Kojima, K and Jordache, N and Chand, N and Kiely, P and Chien, M and Han, M and Michel, E and Ustin, S and Roycroft, S and others},
      • title = {High-speed directly modulated Fabry-Perot and distributed-feedback spot-size-converted lasers suitable for passive alignment, unisolated operation, and uncooled environments up to 85C},
      • journal = {Lightwave Technology, Journal of},
      • year = 2003,
      • volume = 21,
      • number = 1,
      • pages = {69--78},
      • publisher = {IEEE}
      • }
    •  Klotzkin, D; Kojima, K; Jordache, N; Chand, N; Kiely, P; Chien, M; Han, M; Michel, E; Ustin, S; Roycroft, S; others, "Systems/Subsystems-High-Speed Directly Modulated Fabry-Perot and Distributed-Feedback Spot-Size-Converted Lasers Suitable for Passive Alignment, Unisolated Operation, and Uncooled Environments up", IEEE Journal of Lightwave Technology, Vol. 21, No. 1, pp. 69-78, 2003.
      BibTeX
      • @Article{klotzkin2003systems,
      • author = {Klotzkin, D and Kojima, K and Jordache, N and Chand, N and Kiely, P and Chien, M and Han, M and Michel, E and Ustin, S and Roycroft, S and others},
      • title = {Systems/Subsystems-High-Speed Directly Modulated Fabry-Perot and Distributed-Feedback Spot-Size-Converted Lasers Suitable for Passive Alignment, Unisolated Operation, and Uncooled Environments up},
      • journal = {IEEE Journal of Lightwave Technology},
      • year = 2003,
      • volume = 21,
      • number = 1,
      • pages = {69--78},
      • publisher = {New York, NY: Institute of Electrical and Electronics Engineers, c1983-}
      • }
    •  Pau, Stanley; Chand, Naresh; Kojima, Keisuke; Swaminathan, Venkataraman, "Transient effects and cascadability of an MEMS-based dynamic-gain equalizing filter: A case study", Photonics Technology Letters, IEEE, Vol. 15, No. 2, pp. 347-349, 2003.
      BibTeX
      • @Article{pau2003transient,
      • author = {Pau, Stanley and Chand, Naresh and Kojima, Keisuke and Swaminathan, Venkataraman},
      • title = {Transient effects and cascadability of an MEMS-based dynamic-gain equalizing filter: A case study},
      • journal = {Photonics Technology Letters, IEEE},
      • year = 2003,
      • volume = 15,
      • number = 2,
      • pages = {347--349},
      • publisher = {IEEE}
      • }
    •  Soole, JBD; Pafchek, R; Narayanan, C; Bogert, G; Jampanaboyana, L; Chand, N; Yu, J; Fischer, M; Ling, M; Earnshaw, MP; others, "DWDM performance of a packaged reconfigurable optical add-drop multiplexer subsystem supporting modular systems growth", Photonics Technology Letters, IEEE, Vol. 15, No. 11, pp. 1600-1602, 2003.
      BibTeX
      • @Article{soole2003dwdm,
      • author = {Soole, JBD and Pafchek, R and Narayanan, C and Bogert, G and Jampanaboyana, L and Chand, N and Yu, J and Fischer, M and Ling, M and Earnshaw, MP and others},
      • title = {DWDM performance of a packaged reconfigurable optical add-drop multiplexer subsystem supporting modular systems growth},
      • journal = {Photonics Technology Letters, IEEE},
      • year = 2003,
      • volume = 15,
      • number = 11,
      • pages = {1600--1602},
      • publisher = {IEEE}
      • }
    •  Soole, JBD; Chand, N; Earnshaw, MP; Kojima, K; Pafchek, R; Ling, M; Swaminathan, V, "High-performance operation of monolithically-integrated multipurpose reconfigurable optical add-drop multiplexer", Electronics Letters, Vol. 39, No. 5, pp. 436-437, 2003.
      BibTeX
      • @Article{soole2003high,
      • author = {Soole, JBD and Chand, N and Earnshaw, MP and Kojima, K and Pafchek, R and Ling, M and Swaminathan, V},
      • title = {High-performance operation of monolithically-integrated multipurpose reconfigurable optical add-drop multiplexer},
      • journal = {Electronics Letters},
      • year = 2003,
      • volume = 39,
      • number = 5,
      • pages = {436--437},
      • publisher = {IET}
      • }
    •  Wang, Leah L; Yu, Jianjun; Milner, V; Aherne, I; Kojima, K; Mizuhara, O; Swarninathan, V, "Error-free repeaterless transmission over 300 km of SSMF with DMLs, APD receivers, and all-Raman amplification", Electronics Letters, Vol. 39, No. 1, pp. 90-91, 2003.
      BibTeX
      • @Article{wang2003error,
      • author = {Wang, Leah L and Yu, Jianjun and Milner, V and Aherne, I and Kojima, K and Mizuhara, O and Swarninathan, V},
      • title = {Error-free repeaterless transmission over 300 km of SSMF with DMLs, APD receivers, and all-Raman amplification},
      • journal = {Electronics Letters},
      • year = 2003,
      • volume = 39,
      • number = 1,
      • pages = {90--91},
      • publisher = {IET}
      • }
    •  Chand, N; Kojima, K; Bosch, F; Kiely, P; Ransijn, H; Salvador, G; Olson, T; Salamanca, G; Kasper, B, "10.7 Gbit/s Transmission Over 75 km SSMF Using 1.3 m Directly Modulated Uncooled Transmitters at 85C", Optical Communication, 2002. ECOC 2002. 28th European Conference on, 2002, vol. 2, pp. 1-2.
      BibTeX
      • @Inproceedings{chand200210,
      • author = {Chand, N and Kojima, K and Bosch, F and Kiely, P and Ransijn, H and Salvador, G and Olson, T and Salamanca, G and Kasper, B},
      • title = {10.7 Gbit/s Transmission Over 75 km SSMF Using 1.3 m Directly Modulated Uncooled Transmitters at 85C},
      • booktitle = {Optical Communication, 2002. ECOC 2002. 28th European Conference on},
      • year = 2002,
      • volume = 2,
      • pages = {1--2},
      • organization = {IEEE}
      • }
    •  Espindola, RP; Bacher, KL; Kojima, K; Chand, N; Srinivasan, S; Cho, GC; Jin, F; Fuchs, C; Milner, V; Dautremont-Smith, W, "Penalty-free 10 Gbit/s single-channel co-pumped distributed Raman amplification using low RIN 14xx nm DFB pump", Electronics Letters, Vol. 38, No. 3, pp. 113-115, 2002.
      BibTeX
      • @Article{espindola2002penalty,
      • author = {Espindola, RP and Bacher, KL and Kojima, K and Chand, N and Srinivasan, S and Cho, GC and Jin, F and Fuchs, C and Milner, V and Dautremont-Smith, W},
      • title = {Penalty-free 10 Gbit/s single-channel co-pumped distributed Raman amplification using low RIN 14xx nm DFB pump},
      • journal = {Electronics Letters},
      • year = 2002,
      • volume = 38,
      • number = 3,
      • pages = {113--115},
      • publisher = {IET}
      • }
    •  Kojima, K; Fischer, MC; Chand, N; Klotzkin, D; Kiely, PA; Sheridan-Eng, J; Xu, Yan; Tohmon, G, "Effect of reflection on un-isolated spot-size-converted 1.3 m DFB lasers for 2.5 Gbit/s transmission", Optical Fiber Communication Conference and Exhibit, 2002. OFC 2002, 2002, pp. 473-475.
      BibTeX
      • @Inproceedings{kojima2002effect,
      • author = {Kojima, K and Fischer, MC and Chand, N and Klotzkin, D and Kiely, PA and Sheridan-Eng, J and Xu, Yan and Tohmon, G},
      • title = {Effect of reflection on un-isolated spot-size-converted 1.3 m DFB lasers for 2.5 Gbit/s transmission},
      • booktitle = {Optical Fiber Communication Conference and Exhibit, 2002. OFC 2002},
      • year = 2002,
      • pages = {473--475},
      • organization = {IEEE}
      • }
    •  Pau, Stanley; Yu, Jianjun; Kojima, Keisuke; Chand, Naresh; Swaminathan, Venkataraman, "160-Gb/s all-optical MEMS time-slot switch for OTDM and WDM applications", Photonics Technology Letters, IEEE, Vol. 14, No. 10, pp. 1460-1462, 2002.
      BibTeX
      • @Article{pau2002160,
      • author = {Pau, Stanley and Yu, Jianjun and Kojima, Keisuke and Chand, Naresh and Swaminathan, Venkataraman},
      • title = {160-Gb/s all-optical MEMS time-slot switch for OTDM and WDM applications},
      • journal = {Photonics Technology Letters, IEEE},
      • year = 2002,
      • volume = 14,
      • number = 10,
      • pages = {1460--1462},
      • publisher = {IEEE}
      • }
    •  Pau, S; Yu, J; Kojima, K; Chand, N; Swaminathan, V, "All optical time-slot switching for OTDM and WDM applications", Optical Communication, 2002. ECOC 2002. 28th European Conference on, 2002, vol. 4, pp. 1-2.
      BibTeX
      • @Inproceedings{pau2002all,
      • author = {Pau, S and Yu, J and Kojima, K and Chand, N and Swaminathan, V},
      • title = {All optical time-slot switching for OTDM and WDM applications},
      • booktitle = {Optical Communication, 2002. ECOC 2002. 28th European Conference on},
      • year = 2002,
      • volume = 4,
      • pages = {1--2},
      • organization = {IEEE}
      • }
    •  Shin, DS; Wang, J; Bosch, F; Kiely, PA; Chand, N; Fischer, M; Kojima, K; Kasper, BL; Peral, EM; Ransijn, H, "10 Gbit/s transmission over 50 km nonzero dispersion-shifted fibre using 1.3 m directly modulated uncooled transmitters", Electronics Letters, Vol. 38, No. 16, pp. 864-865, 2002.
      BibTeX
      • @Article{shin200210,
      • author = {Shin, DS and Wang, J and Bosch, F and Kiely, PA and Chand, N and Fischer, M and Kojima, K and Kasper, BL and Peral, EM and Ransijn, H},
      • title = {10 Gbit/s transmission over 50 km nonzero dispersion-shifted fibre using 1.3 m directly modulated uncooled transmitters},
      • journal = {Electronics Letters},
      • year = 2002,
      • volume = 38,
      • number = 16,
      • pages = {864--865},
      • publisher = {IET}
      • }
    •  Soole, JBD; Chand, N; Earnshaw, MP; Kojima, K; Pafchek, R; Ling, M; Swaminathan, V, "Multipurpose Reconfigurable Optical Add-Drop Multiplexer (ROADM)", Optical Communication, 2002. ECOC 2002. 28th European Conference on, 2002, vol. 5, pp. 1-2.
      BibTeX
      • @Inproceedings{soole2002multipurpose,
      • author = {Soole, JBD and Chand, N and Earnshaw, MP and Kojima, K and Pafchek, R and Ling, M and Swaminathan, V},
      • title = {Multipurpose Reconfigurable Optical Add-Drop Multiplexer (ROADM)},
      • booktitle = {Optical Communication, 2002. ECOC 2002. 28th European Conference on},
      • year = 2002,
      • volume = 5,
      • pages = {1--2},
      • organization = {IEEE}
      • }
    •  Yu, Jianjun; Fischer, Martin; Chand, Naresh; Kojima, Keisuke; Swaminathan, Venkataraman, "10-Gb/s transmission over 200-km conventional fiber without dispersion compensation using the bias control technique", Photonics Technology Letters, IEEE, Vol. 14, No. 12, pp. 1746-1748, 2002.
      BibTeX
      • @Article{yu200210,
      • author = {Yu, Jianjun and Fischer, Martin and Chand, Naresh and Kojima, Keisuke and Swaminathan, Venkataraman},
      • title = {10-Gb/s transmission over 200-km conventional fiber without dispersion compensation using the bias control technique},
      • journal = {Photonics Technology Letters, IEEE},
      • year = 2002,
      • volume = 14,
      • number = 12,
      • pages = {1746--1748},
      • publisher = {IEEE}
      • }
    •  Yu, Jianjun; Keisuke, K; Chand, Naresh, "WDM-OTDM transmultiplexing using a nonlinear optical loop mirror", Optical Fiber Communication Conference and Exhibit, 2002. OFC 2002, 2002, pp. 756-757.
      BibTeX
      • @Inproceedings{yu2002wdm,
      • author = {Yu, Jianjun and Keisuke, K and Chand, Naresh},
      • title = {WDM-OTDM transmultiplexing using a nonlinear optical loop mirror},
      • booktitle = {Optical Fiber Communication Conference and Exhibit, 2002. OFC 2002},
      • year = 2002,
      • pages = {756--757},
      • organization = {IEEE}
      • }
    •  Espindola, RP; Bacher, KL; Kojima, K; Chand, N; Srinivasan, S; Cho, GC; Jin, F; Fuchs, C; Milner, V; Dautremont-Smith, WC, "High power, low RIN, spectrally-broadened 14xx DFB pump for application in co-pumped Raman amplification", Optical Communication, 2001. ECOC'01. 27th European Conference on, 2001, vol. 6, pp. 36-37.
      BibTeX
      • @Inproceedings{espindola2001high,
      • author = {Espindola, RP and Bacher, KL and Kojima, K and Chand, N and Srinivasan, S and Cho, GC and Jin, F and Fuchs, C and Milner, V and Dautremont-Smith, WC},
      • title = {High power, low RIN, spectrally-broadened 14xx DFB pump for application in co-pumped Raman amplification},
      • booktitle = {Optical Communication, 2001. ECOC'01. 27th European Conference on},
      • year = 2001,
      • volume = 6,
      • pages = {36--37},
      • organization = {IEEE}
      • }
    •  Klotzkin, D; Ustin, S; Gleason, N; Chien, M; Michel, E; Roycroft, S; Kiely, P; Kojima, K; Ketelsen, L, "High speed uncooled spot-size-converted distributed feedback lasers suitable for passive alignment and 2.5 Gb/s operation at 85C", Advanced Semiconductor Lasers and Applications/Ultraviolet and Blue Lasers and Their Applications/Ultralong Haul DWDM Transmission and Networking/WDM Components, 2001. Digest of the LEOS Summer Topica, 2001, pp. 2-pp.
      BibTeX
      • @Inproceedings{klotzkin2001high,
      • author = {Klotzkin, D and Ustin, S and Gleason, N and Chien, M and Michel, E and Roycroft, S and Kiely, P and Kojima, K and Ketelsen, L},
      • title = {High speed uncooled spot-size-converted distributed feedback lasers suitable for passive alignment and 2.5 Gb/s operation at 85C},
      • booktitle = {Advanced Semiconductor Lasers and Applications/Ultraviolet and Blue Lasers and Their Applications/Ultralong Haul DWDM Transmission and Networking/WDM Components, 2001. Digest of the LEOS Summer Topica},
      • year = 2001,
      • pages = {2--pp},
      • organization = {IEEE}
      • }
    •  Yu, Jianjun; Kojima, Keisuke; Chand, Naresh; Fischer, Martin C; Espindola, Rolando; Mason, Tomas GB, "160 Gb/s single-channel unrepeatered transmission over 200 km of non-zero dispersion shifted fiber", Optical Communication, 2001. ECOC'01. 27th European Conference on, 2001, vol. 6, pp. 20-21.
      BibTeX
      • @Inproceedings{yu2001160,
      • author = {Yu, Jianjun and Kojima, Keisuke and Chand, Naresh and Fischer, Martin C and Espindola, Rolando and Mason, Tomas GB},
      • title = {160 Gb/s single-channel unrepeatered transmission over 200 km of non-zero dispersion shifted fiber},
      • booktitle = {Optical Communication, 2001. ECOC'01. 27th European Conference on},
      • year = 2001,
      • volume = 6,
      • pages = {20--21},
      • organization = {IEEE}
      • }
    •  Yu, Jianjun; Kojima, Keisuke; Chand, Naresh; Ougazzaden, Abdallah; Lentz, Charles W; Geary, J Michael; Freund, Joseph M; Mason, Beck, "Simultaneous demultiplexing and clock recovery of 80 Gb/s OTDM signals using a tandem electro-absorption modulator", Lasers and Electro-Optics Society, 2001. LEOS 2001. The 14th Annual Meeting of the IEEE, 2001, vol. 1, pp. 358-359.
      BibTeX
      • @Inproceedings{yu2001simultaneous,
      • author = {Yu, Jianjun and Kojima, Keisuke and Chand, Naresh and Ougazzaden, Abdallah and Lentz, Charles W and Geary, J Michael and Freund, Joseph M and Mason, Beck},
      • title = {Simultaneous demultiplexing and clock recovery of 80 Gb/s OTDM signals using a tandem electro-absorption modulator},
      • booktitle = {Lasers and Electro-Optics Society, 2001. LEOS 2001. The 14th Annual Meeting of the IEEE},
      • year = 2001,
      • volume = 1,
      • pages = {358--359},
      • organization = {IEEE}
      • }
    •  Kojima, Keisuke; Kyuma, Kazuo, "Multi-quantum well distributed feedback and distributed Bragg reflector lasers", Semiconductor Science and Technology, Vol. 5, No. 6, pp. 481, 1999.
      BibTeX
      • @Article{kojima1999multi,
      • author = {Kojima, Keisuke and Kyuma, Kazuo},
      • title = {Multi-quantum well distributed feedback and distributed Bragg reflector lasers},
      • journal = {Semiconductor Science and Technology},
      • year = 1999,
      • volume = 5,
      • number = 6,
      • pages = 481,
      • publisher = {IOP Publishing}
      • }
    •  Kojima, K; Mizuhara, O; Ketelsen, LJP; Kim, I; Bylsma, RB, "1.3 m uncooled DFB lasers for 10Gb/s transmission over 50km of non-dispersion-shifted fiber", Optical Fiber Communication Conference, 1996.
      BibTeX
      • @Inproceedings{kojima19961,
      • author = {Kojima, K and Mizuhara, O and Ketelsen, LJP and Kim, I and Bylsma, RB},
      • title = {1.3 m uncooled DFB lasers for 10Gb/s transmission over 50km of non-dispersion-shifted fiber},
      • booktitle = {Optical Fiber Communication Conference},
      • year = 1996,
      • organization = {Optical Society of America}
      • }
    •  Kojima, Keisuke; Focht, Marlin W; Freund, Joseph M; Geary, John M; Glogovsky, Kenneth G; Guth, Gregory D; Karlicek, Robert F; Luther, Lars C; Przybylek, George J; Reynolds, C Lewis; others, "High power, high efficiency, and highly uniform 1.3 m uncooled InGaAsP/InP strained multi-quantum well lasers", PROCEEDINGS-SPIE THE INTERNATIONAL SOCIETY FOR OPTICAL ENGINEERING, pp. 76-82, 1996.
      BibTeX
      • @Article{kojima1996high,
      • author = {Kojima, Keisuke and Focht, Marlin W and Freund, Joseph M and Geary, John M and Glogovsky, Kenneth G and Guth, Gregory D and Karlicek, Robert F and Luther, Lars C and Przybylek, George J and Reynolds, C Lewis and others},
      • title = {High power, high efficiency, and highly uniform 1.3 m uncooled InGaAsP/InP strained multi-quantum well lasers},
      • journal = {PROCEEDINGS-SPIE THE INTERNATIONAL SOCIETY FOR OPTICAL ENGINEERING},
      • year = 1996,
      • pages = {76--82},
      • publisher = {SPIE INTERNATIONAL SOCIETY FOR OPTICAL}
      • }
    •  Kojima, K, "High-power, high-efficiency, highly uniform 1.3-m InGaAsP/InP strained MQW lasers", Optical Fiber Communication Conference, 1995.
      BibTeX
      • @Inproceedings{kojima1995high,
      • author = {Kojima, K},
      • title = {High-power, high-efficiency, highly uniform 1.3-m InGaAsP/InP strained MQW lasers},
      • booktitle = {Optical Fiber Communication Conference},
      • year = 1995,
      • organization = {Optical Society of America}
      • }
    •  Jiang, Shijun; Pan, Zeqi; Dagenais, Mario; Morgan, Robert A; Kojima, Keisuke, "Influence of external optical feedback on threshold and spectral characteristics of vertical-cavity surface-emitting lasers", Photonics Technology Letters, IEEE, Vol. 6, No. 1, pp. 34-36, 1994.
      BibTeX
      • @Article{jiang1994influence,
      • author = {Jiang, Shijun and Pan, Zeqi and Dagenais, Mario and Morgan, Robert A and Kojima, Keisuke},
      • title = {Influence of external optical feedback on threshold and spectral characteristics of vertical-cavity surface-emitting lasers},
      • journal = {Photonics Technology Letters, IEEE},
      • year = 1994,
      • volume = 6,
      • number = 1,
      • pages = {34--36},
      • publisher = {IEEE}
      • }
    •  Vakhshoori, Daryoosh; Wynn, JD; Hong, M; Asom, M; Kojima, K, "980 nm and 850 nm zone lasers", Semiconductor Laser Conference, 1994., 14th IEEE International, 1994, pp. 153-154.
      BibTeX
      • @Inproceedings{vakhshoori1994980,
      • author = {Vakhshoori, Daryoosh and Wynn, JD and Hong, M and Asom, M and Kojima, K},
      • title = {980 nm and 850 nm zone lasers},
      • booktitle = {Semiconductor Laser Conference, 1994., 14th IEEE International},
      • year = 1994,
      • pages = {153--154},
      • organization = {IEEE}
      • }
    •  Catchmark, JM; Morgan, RA; Kojima, K; Leibenguth, RE; Asom, MT; Guth, GD; Focht, MW; Luther, LC; Przybylek, GP; Mullally, T; others, "Extended temperature and wavelength performance of vertical cavity top surface emitting lasers", Applied physics letters, Vol. 63, No. 23, pp. 3122-3124, 1993.
      BibTeX
      • @Article{catchmark1993extended,
      • author = {Catchmark, JM and Morgan, RA and Kojima, K and Leibenguth, RE and Asom, MT and Guth, GD and Focht, MW and Luther, LC and Przybylek, GP and Mullally, T and others},
      • title = {Extended temperature and wavelength performance of vertical cavity top surface emitting lasers},
      • journal = {Applied physics letters},
      • year = 1993,
      • volume = 63,
      • number = 23,
      • pages = {3122--3124},
      • publisher = {AIP}
      • }
    •  Jiang, Shijun; Pan, Zeqi; Dagenais, M; Morgan, RA; Kojima, K, "High-frequency polarization self-modulation in vertical-cavity surface-emitting lasers", Applied physics letters, Vol. 63, No. 26, pp. 3545-3547, 1993.
      BibTeX
      • @Article{jiang1993high,
      • author = {Jiang, Shijun and Pan, Zeqi and Dagenais, M and Morgan, RA and Kojima, K},
      • title = {High-frequency polarization self-modulation in vertical-cavity surface-emitting lasers},
      • journal = {Applied physics letters},
      • year = 1993,
      • volume = 63,
      • number = 26,
      • pages = {3545--3547},
      • publisher = {AIP}
      • }
    •  Jiang, Shijun; Pan, Zeqi; Dagenais, Mario; Morgan, Rorbert A; Kojima, Keisuke, "Optical feedback effects on the lasing threshold and spectrum of a vertical-cavity surface-emitting laser", Lasers and Electro-Optics Society Annual Meeting, 1993. LEOS'93 Conference Proceedings. IEEE, 1993, pp. 552-553.
      BibTeX
      • @Inproceedings{jiang1993optical,
      • author = {Jiang, Shijun and Pan, Zeqi and Dagenais, Mario and Morgan, Rorbert A and Kojima, Keisuke},
      • title = {Optical feedback effects on the lasing threshold and spectrum of a vertical-cavity surface-emitting laser},
      • booktitle = {Lasers and Electro-Optics Society Annual Meeting, 1993. LEOS'93 Conference Proceedings. IEEE},
      • year = 1993,
      • pages = {552--553},
      • organization = {IEEE}
      • }
    •  Kojima, K; Morgan, RA; Mullaly, T; Guth, GD; Focht, MW; Leibenguth, RE; Asom, MT, "Reduction of p-doped mirror electrical resistance of GaAs/AlGaAs vertical-cavity surface-emitting lasers by delta doping", Electronics Letters, Vol. 29, No. 20, pp. 1771-1772, 1993.
      BibTeX
      • @Article{kojima1993reduction,
      • author = {Kojima, K and Morgan, RA and Mullaly, T and Guth, GD and Focht, MW and Leibenguth, RE and Asom, MT},
      • title = {Reduction of p-doped mirror electrical resistance of GaAs/AlGaAs vertical-cavity surface-emitting lasers by delta doping},
      • journal = {Electronics Letters},
      • year = 1993,
      • volume = 29,
      • number = 20,
      • pages = {1771--1772},
      • publisher = {IET}
      • }
    •  Kuchta, Daniel M; Morgan, RA; Kojima, K; Asom, MT; Guth, GD; Focht, MW; Leibenguth, RE, "Multiple transverse mode VCSEL's for high speed data communications", Lasers and Electro-Optics Society Annual Meeting, 1993. LEOS'93 Conference Proceedings. IEEE, 1993, pp. 372-373.
      BibTeX
      • @Inproceedings{kuchta1993multiple,
      • author = {Kuchta, Daniel M and Morgan, RA and Kojima, K and Asom, MT and Guth, GD and Focht, MW and Leibenguth, RE},
      • title = {Multiple transverse mode VCSEL's for high speed data communications},
      • booktitle = {Lasers and Electro-Optics Society Annual Meeting, 1993. LEOS'93 Conference Proceedings. IEEE},
      • year = 1993,
      • pages = {372--373},
      • organization = {IEEE}
      • }
    •  Morgan, RA; Kojima, K; Asom, MT; Guth, GD; Focht, MW, "1 W (pulsed) vertical cavity surface emitting laser", Electronics Letters, Vol. 29, No. 2, pp. 206-207, 1993.
      BibTeX
      • @Article{morgan19931,
      • author = {Morgan, RA and Kojima, K and Asom, MT and Guth, GD and Focht, MW},
      • title = {1 W (pulsed) vertical cavity surface emitting laser},
      • journal = {Electronics Letters},
      • year = 1993,
      • volume = 29,
      • number = 2,
      • pages = {206--207},
      • publisher = {IET}
      • }
    •  Morgan, Robert A; Kojima, Keisuke, "Optical characteristics of two-dimensional coherently coupled vertical-cavity surface-emitting laser arrays", Optics letters, Vol. 18, No. 5, pp. 352-354, 1993.
      BibTeX
      • @Article{morgan1993optical,
      • author = {Morgan, Robert A and Kojima, Keisuke},
      • title = {Optical characteristics of two-dimensional coherently coupled vertical-cavity surface-emitting laser arrays},
      • journal = {Optics letters},
      • year = 1993,
      • volume = 18,
      • number = 5,
      • pages = {352--354},
      • publisher = {Optical Society of America}
      • }
    •  Morgan, Robert A; Kojima, Keisuke; Rogers, LE; Guth, Gregory D; Leibenguth, Ronald E; Focht, Marlin W; Asom, Moses T; Mullally, T; Gault, William A, "Progress and properties of high-power coherent vertical-cavity surface-emitting laser arrays", OE/LASE'93: Optics, Electro-Optics, & Laser Applications in Science& Engineering, 1993, pp. 100-108.
      BibTeX
      • @Inproceedings{morgan1993progress,
      • author = {Morgan, Robert A and Kojima, Keisuke and Rogers, LE and Guth, Gregory D and Leibenguth, Ronald E and Focht, Marlin W and Asom, Moses T and Mullally, T and Gault, William A},
      • title = {Progress and properties of high-power coherent vertical-cavity surface-emitting laser arrays},
      • booktitle = {OE/LASE'93: Optics, Electro-Optics, \& Laser Applications in Science\& Engineering},
      • year = 1993,
      • pages = {100--108},
      • organization = {International Society for Optics and Photonics}
      • }
    •  Morgan, RA; Guth, GD; Focht, MW; Asom, MT; Kojima, K; Rogers, LE; Callis, SE, "Transverse mode control of vertical-cavity top-surface-emitting lasers", Photonics Technology Letters, IEEE, Vol. 5, No. 4, pp. 374-377, 1993.
      BibTeX
      • @Article{morgan1993transverse,
      • author = {Morgan, RA and Guth, GD and Focht, MW and Asom, MT and Kojima, K and Rogers, LE and Callis, SE},
      • title = {Transverse mode control of vertical-cavity top-surface-emitting lasers},
      • journal = {Photonics Technology Letters, IEEE},
      • year = 1993,
      • volume = 5,
      • number = 4,
      • pages = {374--377},
      • publisher = {IEEE}
      • }
    •  Pan, GZ; Jiang, Shijun; Dagenais, M; Morgan, RA; Kojima, K; Asom, MT; Leibenguth, RE; Guth, GD; Focht, MW, "Fast polarization switching in a vertical-cavity surface-emitting laser under optical injection", Lasers and Electro-Optics Society Annual Meeting, 1993. LEOS'93 Conference Proceedings. IEEE, 1993, pp. 558-559.
      BibTeX
      • @Inproceedings{pan1993fast,
      • author = {Pan, GZ and Jiang, Shijun and Dagenais, M and Morgan, RA and Kojima, K and Asom, MT and Leibenguth, RE and Guth, GD and Focht, MW},
      • title = {Fast polarization switching in a vertical-cavity surface-emitting laser under optical injection},
      • booktitle = {Lasers and Electro-Optics Society Annual Meeting, 1993. LEOS'93 Conference Proceedings. IEEE},
      • year = 1993,
      • pages = {558--559},
      • organization = {IEEE}
      • }
    •  Pan, Z George; Jiang, Shijun; Dagenais, Mario; Morgan, Robert A; Kojima, Keisuke; Asom, Moses T; Leibenguth, Ronald E; Guth, Gregory D; Focht, Marlin W, "Optical injection induced polarization bistability in vertical-cavity surface-emitting lasers", Applied physics letters, Vol. 63, No. 22, pp. 2999-3001, 1993.
      BibTeX
      • @Article{pan1993optical,
      • author = {Pan, Z George and Jiang, Shijun and Dagenais, Mario and Morgan, Robert A and Kojima, Keisuke and Asom, Moses T and Leibenguth, Ronald E and Guth, Gregory D and Focht, Marlin W},
      • title = {Optical injection induced polarization bistability in vertical-cavity surface-emitting lasers},
      • journal = {Applied physics letters},
      • year = 1993,
      • volume = 63,
      • number = 22,
      • pages = {2999--3001},
      • publisher = {AIP}
      • }
    •  Vakhshoori, D; Hong, M; Asom, M; Kojima, K; Leibenguth, RE; Wynn, JD, "980 nm zone lasers [InGaAs quantum wells]", Electron Devices Meeting, 1993. IEDM'93. Technical Digest., International, 1993, pp. 593-595.
      BibTeX
      • @Inproceedings{vakhshoori1993980,
      • author = {Vakhshoori, D and Hong, M and Asom, M and Kojima, K and Leibenguth, RE and Wynn, JD},
      • title = {980 nm zone lasers [InGaAs quantum wells]},
      • booktitle = {Electron Devices Meeting, 1993. IEDM'93. Technical Digest., International},
      • year = 1993,
      • pages = {593--595},
      • organization = {IEEE}
      • }
    •  Vakhshoori, D; Hong, M; Asom, M; Kojima, K, "980nm Zone Lasers", INTERNATIONAL ELECTRON DEVICES MEETING, pp. 593-593, 1993.
      BibTeX
      • @Article{vakhshoori1993980nm,
      • author = {Vakhshoori, D and Hong, M and Asom, M and Kojima, K},
      • title = {980nm Zone Lasers},
      • journal = {INTERNATIONAL ELECTRON DEVICES MEETING},
      • year = 1993,
      • pages = {593--593},
      • publisher = {INSTITUTE OF ELECTRICAL \& ELECTRONIC ENGINEERS, INC (IEEE)}
      • }
    •  Vakhshoori, D; Wynn, JD; Zydzik, GJ; Leibenguth, RE; Asom, MT; Kojima, K; Morgan, RA, "Top-surface emitting lasers with 1.9 V threshold voltage and the effect of spatial hole burning on their transverse mode operation and efficiencies", Applied physics letters, Vol. 62, No. 13, pp. 1448-1450, 1993.
      BibTeX
      • @Article{vakhshoori1993top,
      • author = {Vakhshoori, D and Wynn, JD and Zydzik, GJ and Leibenguth, RE and Asom, MT and Kojima, K and Morgan, RA},
      • title = {Top-surface emitting lasers with 1.9 V threshold voltage and the effect of spatial hole burning on their transverse mode operation and efficiencies},
      • journal = {Applied physics letters},
      • year = 1993,
      • volume = 62,
      • number = 13,
      • pages = {1448--1450},
      • publisher = {AIP}
      • }
    •  Hara, Kunihiko; Kojima, KEISUKE; Mitsunaga, Kazumasa; Kyuma, Kazuo, "AlGaAs-GaAs pnpn differential optical switch", Quantum Electronics, IEEE Journal of, Vol. 28, No. 5, pp. 1335-1342, 1992.
      BibTeX
      • @Article{hara1992algaas,
      • author = {Hara, Kunihiko and Kojima, KEISUKE and Mitsunaga, Kazumasa and Kyuma, Kazuo},
      • title = {AlGaAs-GaAs pnpn differential optical switch},
      • journal = {Quantum Electronics, IEEE Journal of},
      • year = 1992,
      • volume = 28,
      • number = 5,
      • pages = {1335--1342},
      • publisher = {IEEE}
      • }
    •  Morgan, RA; Kojima, K; Mullally, T; Guth, GD; Focht, MW; Leibenguth, RE; Asom, M, "High-power coherently coupled 8x8 vertical cavity surface emitting laser array", Applied physics letters, Vol. 61, No. 10, pp. 1160-1162, 1992.
      BibTeX
      • @Article{morgan1992high,
      • author = {Morgan, RA and Kojima, K and Mullally, T and Guth, GD and Focht, MW and Leibenguth, RE and Asom, M},
      • title = {High-power coherently coupled 8x8 vertical cavity surface emitting laser array},
      • journal = {Applied physics letters},
      • year = 1992,
      • volume = 61,
      • number = 10,
      • pages = {1160--1162},
      • publisher = {AIP}
      • }
    •  Hara, Kunihiko; Kojima, Keisuke; Mitsunaga, Kazumasa; Kyuma, Kazuo, "Enhancement of contrast ratio in pattern edge extraction by using voltage-controlled negative load resistors", Photonics Technology Letters, IEEE, Vol. 3, No. 9, pp. 852-855, 1991.
      BibTeX
      • @Article{hara1991enhancement,
      • author = {Hara, Kunihiko and Kojima, Keisuke and Mitsunaga, Kazumasa and Kyuma, Kazuo},
      • title = {Enhancement of contrast ratio in pattern edge extraction by using voltage-controlled negative load resistors},
      • journal = {Photonics Technology Letters, IEEE},
      • year = 1991,
      • volume = 3,
      • number = 9,
      • pages = {852--855},
      • publisher = {IEEE}
      • }
    •  Hara, Kunihiko; Kojima, Keisuke; Mitsunaga, Kazumasa; Kyuma, Kazuo, "Pattern edge extraction using parallel-connected AlGaAs-GaAs pn-pn optical switches", Photonics Technology Letters, IEEE, Vol. 3, No. 1, pp. 62-64, 1991.
      BibTeX
      • @Article{hara1991pattern,
      • author = {Hara, Kunihiko and Kojima, Keisuke and Mitsunaga, Kazumasa and Kyuma, Kazuo},
      • title = {Pattern edge extraction using parallel-connected AlGaAs-GaAs pn-pn optical switches},
      • journal = {Photonics Technology Letters, IEEE},
      • year = 1991,
      • volume = 3,
      • number = 1,
      • pages = {62--64},
      • publisher = {IEEE}
      • }
    •  Hara, Kunihiko; Kojima, Keisuke; Mitsunaga, Kazumasa; Kyuma, Kazuo, "AlGaAs/GaAs pnpn differential optical switch operable with 400 fJ optical input energy", Applied physics letters, Vol. 57, No. 11, pp. 1075-1077, 1990.
      BibTeX
      • @Article{hara1990algaas,
      • author = {Hara, Kunihiko and Kojima, Keisuke and Mitsunaga, Kazumasa and Kyuma, Kazuo},
      • title = {AlGaAs/GaAs pnpn differential optical switch operable with 400 fJ optical input energy},
      • journal = {Applied physics letters},
      • year = 1990,
      • volume = 57,
      • number = 11,
      • pages = {1075--1077},
      • publisher = {AIP}
      • }
    •  Hara, K; Kojima, K; Mitsunaga, K; Kyuma, K, "Demonstration Of Pattern Edge Extraction Using A Parallel-connected AlGaAs/GaAs Pnpn Optical Switch Array", Lasers and Electro-Optics Society Annual Meeting, 1990. LEOS'90. Conference Proceedings., IEEE, 1990, pp. 255-256.
      BibTeX
      • @Inproceedings{hara1990demonstration,
      • author = {Hara, K and Kojima, K and Mitsunaga, K and Kyuma, K},
      • title = {Demonstration Of Pattern Edge Extraction Using A Parallel-connected AlGaAs/GaAs Pnpn Optical Switch Array},
      • booktitle = {Lasers and Electro-Optics Society Annual Meeting, 1990. LEOS'90. Conference Proceedings., IEEE},
      • year = 1990,
      • pages = {255--256},
      • organization = {IEEE}
      • }
    •  Hara, Kunihiko; Kojima, Keisuke; Mitsunaga, Kazumasa; Kyuma, Kazuo, "Highly sensitive pnpn differential optical switch", Society of Photo-Optical Instrumentation Engineers (SPIE) Conference Series, 1990, vol. 1280, pp. 257-264.
      BibTeX
      • @Inproceedings{hara1990highly,
      • author = {Hara, Kunihiko and Kojima, Keisuke and Mitsunaga, Kazumasa and Kyuma, Kazuo},
      • title = {Highly sensitive pnpn differential optical switch},
      • booktitle = {Society of Photo-Optical Instrumentation Engineers (SPIE) Conference Series},
      • year = 1990,
      • volume = 1280,
      • pages = {257--264}
      • }
    •  Hara, K; Kojima, Keisuke; Mitsunaga, Kazaumasa; Kyuma, Kazuo, "Optical flip-flop based on parallel-connected AlGaAs/GaAs pnpn structures", Optics letters, Vol. 15, No. 13, pp. 749-751, 1990.
      BibTeX
      • @Article{hara1990optical,
      • author = {Hara, K and Kojima, Keisuke and Mitsunaga, Kazaumasa and Kyuma, Kazuo},
      • title = {Optical flip-flop based on parallel-connected AlGaAs/GaAs pnpn structures},
      • journal = {Optics letters},
      • year = 1990,
      • volume = 15,
      • number = 13,
      • pages = {749--751},
      • publisher = {Optical Society of America}
      • }
    •  Hara, K; Kojima, K; Mitsunaga, K; Kyuma, K, "Realization of a Graded-Threshold Function Using an AIGaAs/GaAs pnpn Optical Switch", Photonic switching II: proceedings of the international topical meeting, Kobe, Japan, April 12-14, 1990, pp. 167, 1990.
      BibTeX
      • @Article{hara1990realization,
      • author = {Hara, K and Kojima, K and Mitsunaga, K and Kyuma, K},
      • title = {Realization of a Graded-Threshold Function Using an AIGaAs/GaAs pnpn Optical Switch},
      • journal = {Photonic switching II: proceedings of the international topical meeting, Kobe, Japan, April 12-14, 1990},
      • year = 1990,
      • pages = 167,
      • publisher = {Springer Verlag}
      • }
    •  Kojima, Keisuke; Mitsunaga, Kazumasa; Kyuma, Kazuo, "Fabrication and characterization of quantum well wires grown on corrugated GaAs substrates by molecular beam epitaxy", Applied Physics Letters, Vol. 56, No. 2, pp. 154-156, 1990.
      BibTeX
      • @Article{kojima1990fabrication,
      • author = {Kojima, Keisuke and Mitsunaga, Kazumasa and Kyuma, Kazuo},
      • title = {Fabrication and characterization of quantum well wires grown on corrugated GaAs substrates by molecular beam epitaxy},
      • journal = {Applied Physics Letters},
      • year = 1990,
      • volume = 56,
      • number = 2,
      • pages = {154--156},
      • publisher = {AIP}
      • }
    •  Noda, Susumu; Kojima, KEISUKE; Kyuma, Kazuo, "Mutual injection-locking properties of monolithically-integrated surface-emitting multiple-quantum-well distributed feedback lasers", Quantum Electronics, IEEE Journal of, Vol. 26, No. 11, pp. 1883-1894, 1990.
      BibTeX
      • @Article{noda1990mutual,
      • author = {Noda, Susumu and Kojima, KEISUKE and Kyuma, Kazuo},
      • title = {Mutual injection-locking properties of monolithically-integrated surface-emitting multiple-quantum-well distributed feedback lasers},
      • journal = {Quantum Electronics, IEEE Journal of},
      • year = 1990,
      • volume = 26,
      • number = 11,
      • pages = {1883--1894},
      • publisher = {IEEE}
      • }
    •  Ohta, J; Kojima, K; Nitta, Y; Tai, S; Kyuma, K, "Optical neurochip based on a three-layered feed-forward model", Optics letters, Vol. 15, No. 23, pp. 1362-1364, 1990.
      BibTeX
      • @Article{ohta1990optical,
      • author = {Ohta, J and Kojima, K and Nitta, Y and Tai, S and Kyuma, K},
      • title = {Optical neurochip based on a three-layered feed-forward model},
      • journal = {Optics letters},
      • year = 1990,
      • volume = 15,
      • number = 23,
      • pages = {1362--1364},
      • publisher = {Optical Society of America}
      • }
    •  Hara, K; Kojima, K; Mitsunga, K; Kyuma, K, "Differential optical switching at subnanowatt input power", Photonics Technology Letters, IEEE, Vol. 1, No. 11, pp. 370-372, 1989.
      BibTeX
      • @Article{Hara1989,
      • author = {Hara, K and Kojima, K and Mitsunga, K and Kyuma, K},
      • title = {Differential optical switching at subnanowatt input power},
      • journal = {Photonics Technology Letters, IEEE},
      • year = 1989,
      • volume = 1,
      • number = 11,
      • pages = {370--372},
      • publisher = {IEEE}
      • }
    •  Hara, K; Kojima, K; Mitsunaga, K; Kyuma, K, "Differential optical comparator using parallel connected AlGaAs pnpn optical switches", Electronics Letters, Vol. 25, No. 7, pp. 433-434, 1989.
      BibTeX
      • @Article{Hara1989a,
      • author = {Hara, K and Kojima, K and Mitsunaga, K and Kyuma, K},
      • title = {Differential optical comparator using parallel connected AlGaAs pnpn optical switches},
      • journal = {Electronics Letters},
      • year = 1989,
      • volume = 25,
      • number = 7,
      • pages = {433--434},
      • publisher = {IET}
      • }
    •  Kojima, Keisuke; Mitsunaga, Kazumasa; Kyuma, Kazuo, "Calculation of two-dimensional quantum-confined structures using the finite element method", Applied Physics Letters, Vol. 55, No. 9, pp. 882-884, 1989.
      BibTeX
      • @Article{kojima1989calculation,
      • author = {Kojima, Keisuke and Mitsunaga, Kazumasa and Kyuma, Kazuo},
      • title = {Calculation of two-dimensional quantum-confined structures using the finite element method},
      • journal = {Applied Physics Letters},
      • year = 1989,
      • volume = 55,
      • number = 9,
      • pages = {882--884},
      • publisher = {AIP}
      • }
    •  Kojima, K; Hara, K; Kameya, M; Kyuma, K, "Narrow-linewidth AlGaAs/GaAs multiple quantum well distributed feedback lasers", Electronics Letters, Vol. 25, No. 3, pp. 240-241, 1989.
      BibTeX
      • @Article{kojima1989narrow,
      • author = {Kojima, K and Hara, K and Kameya, M and Kyuma, K},
      • title = {Narrow-linewidth AlGaAs/GaAs multiple quantum well distributed feedback lasers},
      • journal = {Electronics Letters},
      • year = 1989,
      • volume = 25,
      • number = 3,
      • pages = {240--241},
      • publisher = {IET}
      • }
    •  Kyuma, K; Tai, S; Kojima, K; Takahashi, M, "Fiber-Optic Resonant Ring Sensors: System and Device Technology", Optical Fiber Sensors: Proceedings of the 6th International Conference, OFS'89, Paris, France, September 18-20, 1989, pp. 84, 1989.
      BibTeX
      • @Article{kyuma1989fiber,
      • author = {Kyuma, K and Tai, S and Kojima, K and Takahashi, M},
      • title = {Fiber-Optic Resonant Ring Sensors: System and Device Technology},
      • journal = {Optical Fiber Sensors: Proceedings of the 6th International Conference, OFS'89, Paris, France, September 18-20, 1989},
      • year = 1989,
      • pages = 84,
      • publisher = {Springer}
      • }
    •  Kojima, Keisuke; Kyuma, Kazuo, "Analysis of the linewidth of distributed feedback laser diodes using the Green's function method", Japanese journal of applied physics, Vol. 27, No. part 2, 1988.
      BibTeX
      • @Article{kojima1988analysis,
      • author = {Kojima, Keisuke and Kyuma, Kazuo},
      • title = {Analysis of the linewidth of distributed feedback laser diodes using the Green's function method},
      • journal = {Japanese journal of applied physics},
      • year = 1988,
      • volume = 27,
      • number = {part 2}
      • }
    •  Kojima, Keisuke; Kyuma, Kazuo, "Fast beam switching in surface-emitting distributed Bragg reflector laser", Applied physics letters, Vol. 53, No. 15, pp. 1357-1359, 1988.
      BibTeX
      • @Article{kojima1988fast,
      • author = {Kojima, Keisuke and Kyuma, Kazuo},
      • title = {Fast beam switching in surface-emitting distributed Bragg reflector laser},
      • journal = {Applied physics letters},
      • year = 1988,
      • volume = 53,
      • number = 15,
      • pages = {1357--1359},
      • publisher = {AIP}
      • }
    •  Kojima, K; Kameya, M; Noda, S; Kyuma, K, "High efficiency surface-emitting distributed Bragg reflector laser array", Electronics Letters, Vol. 24, No. 5, pp. 283-284, 1988.
      BibTeX
      • @Article{kojima1988high,
      • author = {Kojima, K and Kameya, M and Noda, S and Kyuma, K},
      • title = {High efficiency surface-emitting distributed Bragg reflector laser array},
      • journal = {Electronics Letters},
      • year = 1988,
      • volume = 24,
      • number = 5,
      • pages = {283--284},
      • publisher = {IET}
      • }
    •  Kojima, Keisuke; Kyuma, Kazuo; Noda, Susumu; Ohta, Jun; Hamanaka, Koichi, "Ultrafast switching characteristics of a bistable surface-emitting multiple quantum well distributed Bragg reflector laser", Applied physics letters, Vol. 52, No. 12, pp. 942-944, 1988.
      BibTeX
      • @Article{kojima1988ultrafast,
      • author = {Kojima, Keisuke and Kyuma, Kazuo and Noda, Susumu and Ohta, Jun and Hamanaka, Koichi},
      • title = {Ultrafast switching characteristics of a bistable surface-emitting multiple quantum well distributed Bragg reflector laser},
      • journal = {Applied physics letters},
      • year = 1988,
      • volume = 52,
      • number = 12,
      • pages = {942--944},
      • publisher = {AIP}
      • }
    •  Kyuma, Kazuo; Ohta, Jun; Kojima, Keisuke; Nakayama, Takashi, "Optical neural networks: System and device technologies", SPIE-Optical Computing, Vol. 963, pp. 475-484, 1988.
      BibTeX
      • @Article{kyuma1988optical,
      • author = {Kyuma, Kazuo and Ohta, Jun and Kojima, Keisuke and Nakayama, Takashi},
      • title = {Optical neural networks: System and device technologies},
      • journal = {SPIE-Optical Computing},
      • year = 1988,
      • volume = 963,
      • pages = {475--484}
      • }
    •  Noda, S; Kojima, K; Kyuma, K, "Surface-emitting multiple quantum well distributed feedback laser with a broad-area grating coupler", Electronics Letters, Vol. 24, No. 5, pp. 277-278, 1988.
      BibTeX
      • @Article{noda1988surface,
      • author = {Noda, S and Kojima, K and Kyuma, K},
      • title = {Surface-emitting multiple quantum well distributed feedback laser with a broad-area grating coupler},
      • journal = {Electronics Letters},
      • year = 1988,
      • volume = 24,
      • number = 5,
      • pages = {277--278},
      • publisher = {IET}
      • }
    •  Kameya, M; Tai, S; Kojima, K; Kyuma, K; Hamanaka, K; Nakayama, T, "Stabilisation of oscillation frequency of an AlGaAs/GaAs ridge waveguide distributed feedback laser", Electronics Letters, Vol. 23, No. 5, pp. 245-246, 1987.
      BibTeX
      • @Article{kameya1987stabilisation,
      • author = {Kameya, M and Tai, S and Kojima, K and Kyuma, K and Hamanaka, K and Nakayama, T},
      • title = {Stabilisation of oscillation frequency of an AlGaAs/GaAs ridge waveguide distributed feedback laser},
      • journal = {Electronics Letters},
      • year = 1987,
      • volume = 23,
      • number = 5,
      • pages = {245--246},
      • publisher = {IET}
      • }
    •  Kojima, Keisuke; Noda, Susumu; Mitsunaga, Kazumasa; Kyuma, Kazuo; Hamanaka, Koichi, "Continuous wave operation of a surface-emitting AlGaAs/GaAs multiquantum well distributed Bragg reflector laser", Applied physics letters, Vol. 50, No. 24, pp. 1705-1707, 1987.
      BibTeX
      • @Article{kojima1987continuous,
      • author = {Kojima, Keisuke and Noda, Susumu and Mitsunaga, Kazumasa and Kyuma, Kazuo and Hamanaka, Koichi},
      • title = {Continuous wave operation of a surface-emitting AlGaAs/GaAs multiquantum well distributed Bragg reflector laser},
      • journal = {Applied physics letters},
      • year = 1987,
      • volume = 50,
      • number = 24,
      • pages = {1705--1707},
      • publisher = {AIP}
      • }
    •  Kojima, Keisuke; Noda, Susumu; Mitsunaga, Kazumasa; Kyuma, Kazuo; Hamanaka, Koichi; Nakayama, Takashi, "Edge-and surface-emitting distributed Bragg reflector laser with multiquantum well active/passive waveguides", Applied physics letters, Vol. 50, No. 5, pp. 227-229, 1987.
      BibTeX
      • @Article{kojima1987edge,
      • author = {Kojima, Keisuke and Noda, Susumu and Mitsunaga, Kazumasa and Kyuma, Kazuo and Hamanaka, Koichi and Nakayama, Takashi},
      • title = {Edge-and surface-emitting distributed Bragg reflector laser with multiquantum well active/passive waveguides},
      • journal = {Applied physics letters},
      • year = 1987,
      • volume = 50,
      • number = 5,
      • pages = {227--229},
      • publisher = {AIP}
      • }
    •  Mitsunaga, Kazumasa; Kameya, Masaaki; Kojima, Keisuke; Noda, Susumu; Kyuma, Kazuo; Hamanaka, Koichi; Nakayama, Takashi, "cw surface-emitting grating-coupled GaAs/AlGaAs distributed feedback laser with very narrow beam divergence", Applied physics letters, Vol. 50, No. 25, pp. 1788-1790, 1987.
      BibTeX
      • @Article{mitsunaga1987cw,
      • author = {Mitsunaga, Kazumasa and Kameya, Masaaki and Kojima, Keisuke and Noda, Susumu and Kyuma, Kazuo and Hamanaka, Koichi and Nakayama, Takashi},
      • title = {cw surface-emitting grating-coupled GaAs/AlGaAs distributed feedback laser with very narrow beam divergence},
      • journal = {Applied physics letters},
      • year = 1987,
      • volume = 50,
      • number = 25,
      • pages = {1788--1790},
      • publisher = {AIP}
      • }
    •  Mitsunaga, K; Noda, S; Kojima, K; Kameya, M; Kyuma, K; Hamanaka, K; Nakayama, T, "GaAs/AlGaAs distributed feedback transverse junction stripe laser grown by molecular beam epitaxy", Applied physics letters, Vol. 50, No. 23, pp. 1622-1624, 1987.
      BibTeX
      • @Article{mitsunaga1987gaas,
      • author = {Mitsunaga, K and Noda, S and Kojima, K and Kameya, M and Kyuma, K and Hamanaka, K and Nakayama, T},
      • title = {GaAs/AlGaAs distributed feedback transverse junction stripe laser grown by molecular beam epitaxy},
      • journal = {Applied physics letters},
      • year = 1987,
      • volume = 50,
      • number = 23,
      • pages = {1622--1624},
      • publisher = {AIP}
      • }
    •  Noda, Susumu; Kojima, Keisuke; Mitsunaga, Kazumasa; Kyuma, Kazuo; Hamanaka, Koich; Nakayama, Takashi, "Monolithic integration of an AlGaAs/GaAs multiple quantum well distributed feedback laser and a grating coupler for surface emission", Applied physics letters, Vol. 51, No. 15, pp. 1200-1202, 1987.
      BibTeX
      • @Article{noda1987monolithic,
      • author = {Noda, Susumu and Kojima, Keisuke and Mitsunaga, Kazumasa and Kyuma, Kazuo and Hamanaka, Koich and Nakayama, Takashi},
      • title = {Monolithic integration of an AlGaAs/GaAs multiple quantum well distributed feedback laser and a grating coupler for surface emission},
      • journal = {Applied physics letters},
      • year = 1987,
      • volume = 51,
      • number = 15,
      • pages = {1200--1202},
      • publisher = {AIP}
      • }
    •  Noda, Susumu; Kojima, Keisuke; Kyuma, Kazuo; Hamanaka, Koichi; Nakayama, Takashi, "Reduction of spectral linewidth in AlGaAs/GaAs distributed feedback lasers by a multiple quantum well structure", Applied physics letters, Vol. 50, No. 14, pp. 863-865, 1987.
      BibTeX
      • @Article{noda1987reduction,
      • author = {Noda, Susumu and Kojima, Keisuke and Kyuma, Kazuo and Hamanaka, Koichi and Nakayama, Takashi},
      • title = {Reduction of spectral linewidth in AlGaAs/GaAs distributed feedback lasers by a multiple quantum well structure},
      • journal = {Applied physics letters},
      • year = 1987,
      • volume = 50,
      • number = 14,
      • pages = {863--865},
      • publisher = {AIP}
      • }
    •  Noda, Susumu; Kojima, KEISUKE; Mitsunaga, Kazumasa; Kyuma, Kazuo; Hamanaka, Kohichi; Nakayama, T, "Ridge waveguide AlGaAs/GaAs distributed feedback lasers", Quantum Electronics, IEEE Journal of, Vol. 23, No. 2, pp. 188-193, 1987.
      BibTeX
      • @Article{noda1987ridge,
      • author = {Noda, Susumu and Kojima, KEISUKE and Mitsunaga, Kazumasa and Kyuma, Kazuo and Hamanaka, Kohichi and Nakayama, T},
      • title = {Ridge waveguide AlGaAs/GaAs distributed feedback lasers},
      • journal = {Quantum Electronics, IEEE Journal of},
      • year = 1987,
      • volume = 23,
      • number = 2,
      • pages = {188--193},
      • publisher = {IEEE}
      • }
    •  Kojima, K; Noda, S; Kyuma, K, "Analysis of multiple-quantum-well distributed feedback laser", Electronics Letters, Vol. 22, No. 23, pp. 1246-1247, 1986.
      BibTeX
      • @Article{kojima1986analysis,
      • author = {Kojima, K and Noda, S and Kyuma, K},
      • title = {Analysis of multiple-quantum-well distributed feedback laser},
      • journal = {Electronics Letters},
      • year = 1986,
      • volume = 22,
      • number = 23,
      • pages = {1246--1247},
      • publisher = {IET}
      • }
    •  Kojima, Keisuke; Noda, Susumu; Tai, Shuichi; Kyuma, Kazuo; Hamanaki, Koichi; Nakayama, Takashi, "Long cavity ridge waveguide AlGaAs/GaAs distributed feedback lasers for spectral linewidth reduction", Applied physics letters, Vol. 49, No. 7, pp. 366-368, 1986.
      BibTeX
      • @Article{kojima1986long,
      • author = {Kojima, Keisuke and Noda, Susumu and Tai, Shuichi and Kyuma, Kazuo and Hamanaki, Koichi and Nakayama, Takashi},
      • title = {Long cavity ridge waveguide AlGaAs/GaAs distributed feedback lasers for spectral linewidth reduction},
      • journal = {Applied physics letters},
      • year = 1986,
      • volume = 49,
      • number = 7,
      • pages = {366--368},
      • publisher = {AIP}
      • }
    •  Kojima, K; Noda, S; Tai, S; Kyuma, K; Nakayama, T, "Measurement of spectral linewidth of AlGaAs/GaAs distributed feedback lasers", Electronics Letters, Vol. 22, No. 8, pp. 425-427, 1986.
      BibTeX
      • @Article{kojima1986measurement,
      • author = {Kojima, K and Noda, S and Tai, S and Kyuma, K and Nakayama, T},
      • title = {Measurement of spectral linewidth of AlGaAs/GaAs distributed feedback lasers},
      • journal = {Electronics Letters},
      • year = 1986,
      • volume = 22,
      • number = 8,
      • pages = {425--427},
      • publisher = {IET}
      • }
    •  Mitsunaga, K; Ota, J; Kojima, K; Noda, S; Kyuma, K, "AlGaAs laser diodes grown by molecular-beam epitaxy," Tech. Rep., Mitsubishi Electric Corp., Tokyo (Japan), 1986.
      BibTeX
      • @Techreport{mitsunaga1986algaas,
      • author = {Mitsunaga, K and Ota, J and Kojima, K and Noda, S and Kyuma, K},
      • title = {AlGaAs laser diodes grown by molecular-beam epitaxy},
      • institution = {Mitsubishi Electric Corp., Tokyo (Japan)},
      • year = 1986
      • }
    •  Noda, Susumu; Kojima, Keisuke; Mitsunaga, Kazumasa; Kyuma, Kazuo; Nakayama, Takashi, "Continuous wave operation of ridge waveguide AlGaAs/GaAs distributed feedback lasers with low threshold current", Applied physics letters, Vol. 48, No. 1, pp. 4-6, 1986.
      BibTeX
      • @Article{noda1986continuous,
      • author = {Noda, Susumu and Kojima, Keisuke and Mitsunaga, Kazumasa and Kyuma, Kazuo and Nakayama, Takashi},
      • title = {Continuous wave operation of ridge waveguide AlGaAs/GaAs distributed feedback lasers with low threshold current},
      • journal = {Applied physics letters},
      • year = 1986,
      • volume = 48,
      • number = 1,
      • pages = {4--6},
      • publisher = {AIP}
      • }
    •  Noda, S; Kojima, K; Mitsunaga, K; Kyuma, K; Hamanaka, K; Nakayama, T, "High-power operation of a ridge-waveguide AlGaAs/GaAs distributed feedback laser", Electronics letters, Vol. 22, No. 6, pp. 310-312, 1986.
      BibTeX
      • @Article{noda1986high,
      • author = {Noda, S and Kojima, K and Mitsunaga, K and Kyuma, K and Hamanaka, K and Nakayama, T},
      • title = {High-power operation of a ridge-waveguide AlGaAs/GaAs distributed feedback laser},
      • journal = {Electronics letters},
      • year = 1986,
      • volume = 22,
      • number = 6,
      • pages = {310--312},
      • publisher = {IET}
      • }
    •  Noda, S; Kojima, K; Mitsunaga, K; Kyuma, K; Hamanaka, K; Nakayama, T, "Ridge waveguide AlGaAs/GaAs distributed feedback lasers with multiple quantum well structure", Applied physics letters, Vol. 48, No. 26, pp. 1767-1769, 1986.
      BibTeX
      • @Article{noda1986ridge,
      • author = {Noda, S and Kojima, K and Mitsunaga, K and Kyuma, K and Hamanaka, K and Nakayama, T},
      • title = {Ridge waveguide AlGaAs/GaAs distributed feedback lasers with multiple quantum well structure},
      • journal = {Applied physics letters},
      • year = 1986,
      • volume = 48,
      • number = 26,
      • pages = {1767--1769},
      • publisher = {AIP}
      • }
    •  Tai, Shuichi; Kojima, Keisuke; Noda, Susumu; Kyuma, Kazuo; Hamanaka, Koichi; Nakayama, Takashi, "Narrow spectral linewidth semiconductor optical-fiber ring laser", Applied physics letters, Vol. 49, No. 20, pp. 1328-1330, 1986.
      BibTeX
      • @Article{tai1986narrow,
      • author = {Tai, Shuichi and Kojima, Keisuke and Noda, Susumu and Kyuma, Kazuo and Hamanaka, Koichi and Nakayama, Takashi},
      • title = {Narrow spectral linewidth semiconductor optical-fiber ring laser},
      • journal = {Applied physics letters},
      • year = 1986,
      • volume = 49,
      • number = 20,
      • pages = {1328--1330},
      • publisher = {AIP}
      • }
    •  Tokuda, Yasunori; Fujiwara, Kenzo; Tsukada, Noriaki; Kojima, Keisuke; Hamanaka, Koichi; Nakayama, Takashi, "Carrier-temperature and wavelength-switching in GaAs single-quantum-well laser diode", Japanese journal of applied physics, Vol. 25, No. 11, pp. L931-L933, 1986.
      BibTeX
      • @Article{tokuda1986carrier,
      • author = {Tokuda, Yasunori and Fujiwara, Kenzo and Tsukada, Noriaki and Kojima, Keisuke and Hamanaka, Koichi and Nakayama, Takashi},
      • title = {Carrier-temperature and wavelength-switching in GaAs single-quantum-well laser diode},
      • journal = {Japanese journal of applied physics},
      • year = 1986,
      • volume = 25,
      • number = 11,
      • pages = {L931--L933}
      • }
    •  Kojima, KEISUKE; Kyuma, Kazuo; Nakayama, Takashi, "Analysis of the spectral linewidth of distributed feedback laser diodes", Lightwave Technology, Journal of, Vol. 3, No. 5, pp. 1048-1055, 1985.
      BibTeX
      • @Article{kojima1985analysis,
      • author = {Kojima, KEISUKE and Kyuma, Kazuo and Nakayama, Takashi},
      • title = {Analysis of the spectral linewidth of distributed feedback laser diodes},
      • journal = {Lightwave Technology, Journal of},
      • year = 1985,
      • volume = 3,
      • number = 5,
      • pages = {1048--1055},
      • publisher = {IEEE}
      • }
    •  Kojima, Keisuke; Kyuma, Kazuo; Nakayama, Takashi, "Effect of the longitudinal-mode characteristics on the stability of fiber-optic laser Doppler velocimeters", Optical Fiber Sensors, 1985.
      BibTeX
      • @Inproceedings{kojima1985effect,
      • author = {Kojima, Keisuke and Kyuma, Kazuo and Nakayama, Takashi},
      • title = {Effect of the longitudinal-mode characteristics on the stability of fiber-optic laser Doppler velocimeters},
      • booktitle = {Optical Fiber Sensors},
      • year = 1985,
      • organization = {Optical Society of America}
      • }
    •  Kojima, Keisuke; Noda, Susumu; Mitsunaga, Kazumasa; Kyuma, Kazuo; Nakayama, Takashi, "Low threshold current AlGaAs/GaAs distributed feedback laser grown by two-step molecular beam epitaxy", Applied Physics Letters, Vol. 47, No. 6, pp. 570-572, 1985.
      BibTeX
      • @Article{kojima1985low,
      • author = {Kojima, Keisuke and Noda, Susumu and Mitsunaga, Kazumasa and Kyuma, Kazuo and Nakayama, Takashi},
      • title = {Low threshold current AlGaAs/GaAs distributed feedback laser grown by two-step molecular beam epitaxy},
      • journal = {Applied Physics Letters},
      • year = 1985,
      • volume = 47,
      • number = 6,
      • pages = {570--572},
      • publisher = {AIP}
      • }
    •  Kojima, KEISUKE; Kyuma, KAZUO, "Analysis of the spectral linewidth of distributed feedback laser diodes", Electronics Letters, Vol. 20, No. 21, pp. 869-871, 1984.
      BibTeX
      • @Article{kojima1984analysis,
      • author = {Kojima, KEISUKE and Kyuma, KAZUO},
      • title = {Analysis of the spectral linewidth of distributed feedback laser diodes},
      • journal = {Electronics Letters},
      • year = 1984,
      • volume = 20,
      • number = 21,
      • pages = {869--871},
      • publisher = {IET}
      • }
    •  Kyuma, Kazuo; Kojima, Keisuke; Nunoshita, Masahiro; Nakayama, Takashi, "Signal Enhancement Of A Fiber-Optic Ldv Using A High Power Ar-Ion Laser Oscillated In Multi-Longitudinal Modes", Conference proceedings, OFS'84: 2nd International Conference on Optical Fiber Sensors, September 5-7, 1984 Liederhalle Stuttgart, Federal Republic of Germany, Vol. 2, pp. 39, 1984.
      BibTeX
      • @Article{kyuma1984signal,
      • author = {Kyuma, Kazuo and Kojima, Keisuke and Nunoshita, Masahiro and Nakayama, Takashi},
      • title = {Signal Enhancement Of A Fiber-Optic Ldv Using A High Power Ar-Ion Laser Oscillated In Multi-Longitudinal Modes},
      • journal = {Conference proceedings, OFS'84: 2nd International Conference on Optical Fiber Sensors, September 5-7, 1984 Liederhalle Stuttgart, Federal Republic of Germany},
      • year = 1984,
      • volume = 2,
      • pages = 39,
      • publisher = {Vde-Verlag}
      • }
    •  Kyuma, Kazuo; Tai, Shuichi; Kojima, Keisuke; Nakayama, Takashi, "Semiconductor Laser And Integrated Optics For Optical Fiber Sensors".
      BibTeX
      • @Article{kyumasemiconductor,
      • author = {Kyuma, Kazuo and Tai, Shuichi and Kojima, Keisuke and Nakayama, Takashi},
      • title = {Semiconductor Laser And Integrated Optics For Optical Fiber Sensors}
      • }
    •  Yu, Jianjun; Kojima, Keisuke; Chand, Naresh; Ougazzaden, Abdallah; Lentz, Charles W; Geary, J Michael; Freund, Joseph M; Mason, Beck, "OTDM Signals Using a Tandem Electro-absorption Modulator".
      BibTeX
      • @Article{yuotdm,
      • author = {Yu, Jianjun and Kojima, Keisuke and Chand, Naresh and Ougazzaden, Abdallah and Lentz, Charles W and Geary, J Michael and Freund, Joseph M and Mason, Beck},
      • title = {OTDM Signals Using a Tandem Electro-absorption Modulator}
      • }
  • Videos

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      Issue Date: Sep 8, 2015
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      Inventors: Kojima, Keisuke; Ozbayat, Selman; Koike-Akino, Toshiaki; Wang, Bingnan; Nishikawa, Satoshi; Yagyu, Eiji
      Patent No.: 9,116,298
      Issue Date: Aug 25, 2015
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      Issue Date: Aug 4, 2015
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      Patent No.: 9,077,508
      Issue Date: Jul 7, 2015
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      Inventors: Kojima, Keisuke; Wang, Bingnan; Koike-Akino, Toshiaki; Yagyu, Eiji; Nishikawa, Satoshi
      Patent No.: 9,052,461
      Issue Date: Jun 9, 2015
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