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Proceedings Paper

Nonlinear compensation technologies for future optical communication systems
Author(s): Tomofumi Oyama; Takeshi Hoshida; Hisao Nakashima; Shoichiro Oda; Tomohiro Yamauchi; Takahito Tanimura; Liang Dou; Ying Zhao; Zhenning Tao; Jens C. Rasmussen
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Paper Abstract

Digital nonlinear compensation techniques have been thought to be keys to realize further spectrally efficient optical fiber communication systems. The most critical issue of the digital nonlinear compensation algorithms has been their computational complexity, or gate count of digital signal processing circuit. Among several approaches, digital nonlinear compensation algorithms based on perturbation analysis are attractive in terms of the hardware efficiency because the algorithms can compensate the accumulated nonlinear noise over all transmission spans with only one stage. In this paper, we discuss three approaches to sophisticate the perturbation nonlinear compensation. First, we illustrate a perturbation-based post-equalization method to improve the robustness to transceiver device imperfections. We next propose and numerically evaluate a symbol degeneration method to extend the perturbation nonlinear compensation methods to higher-order QAM without increasing the computational complexity. Finally, we discuss a sub-band processing of perturbation nonlinear compensation for further computational complexity reduction. By combining the perturbation method with Nyquist frequency division multiplexing, the computational complexity of perturbation calculation is reduced by a factor of more than 10 for 3000-km single-channel transmission of 128 Gbit/s dualpolarization QPSK with only 0.1 dB performance degradation.

Paper Details

Date Published: 7 February 2015
PDF: 11 pages
Proc. SPIE 9389, Next-Generation Optical Communication: Components, Sub-Systems, and Systems IV, 93890I (7 February 2015); doi: 10.1117/12.2077028
Show Author Affiliations
Tomofumi Oyama, Fujitsu Labs., Ltd. (Japan)
Takeshi Hoshida, Fujitsu Ltd. (Japan)
Hisao Nakashima, Fujitsu Ltd. (Japan)
Shoichiro Oda, Fujitsu Labs., Ltd. (Japan)
Tomohiro Yamauchi, Fujitsu Labs., Ltd. (Japan)
Takahito Tanimura, Fujitsu Labs., Ltd. (Japan)
Liang Dou, Fujitsu Research and Development Ctr. Co., Ltd. (China)
Ying Zhao, Fujitsu Research and Development Ctr. Co., Ltd. (China)
Zhenning Tao, Fujitsu Research and Development Ctr. Co., Ltd. (China)
Jens C. Rasmussen, Fujitsu Ltd. (Japan)

Published in SPIE Proceedings Vol. 9389:
Next-Generation Optical Communication: Components, Sub-Systems, and Systems IV
Guifang Li; Xiang Zhou, Editor(s)

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