TR2012-055

High-order Statistical Equalizer for Nonlinearity Compensation in Dispersion-managed Coherent Optical Communications


    •  Koike-Akino, T.; Duan, C.; Parsons, K.; Kojima, K.; Yoshida, T.; Sugihara, T.; Mizuochi, T., "High-order Statistical Equalizer for Nonlinearity Compensation in Dispersion-managed Coherent Optical Communications", Optics Express, DOI: 10.1364/OE.20.015769, Vol. 20, No. 14, pp. 15769-15780, June 2012.
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      • @article{Koike-Akino2012jun,
      • author = {Koike-Akino, T. and Duan, C. and Parsons, K. and Kojima, K. and Yoshida, T. and Sugihara, T. and Mizuochi, T.},
      • title = {High-order Statistical Equalizer for Nonlinearity Compensation in Dispersion-managed Coherent Optical Communications},
      • journal = {Optics Express},
      • year = 2012,
      • volume = 20,
      • number = 14,
      • pages = {15769--15780},
      • month = jun,
      • doi = {10.1364/OE.20.015769},
      • url = {http://www.merl.com/publications/TR2012-055}
      • }
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  • Research Areas:

    Electronics & Communications, Optical Communications & Devices


Fiber nonlinearity has become a major limiting factor to realize ultra-high-speed optical communications. We propose a fractionally-spaced equalizer which exploits a trained high-order statistics to deal with data-pattern dependent nonlinear impairments in fiber-optic communications. The computer simulation reveals that the proposed 3-tap equalizer improves Q-factor by more than 2 dB for long-haul transmissions of 5,230 km distance and 40 Gbps data rate. We also demonstrate that the joint use of a digital backpropagation (DBP) and the proposed equalizer offers an additional 1-2 dB performance improvement due to the channel shortening gain. A performance in high-speed transmissions of 100 Gbps and beyond is evaluated as well.