Journal
OPTICS EXPRESS
Volume 26, Issue 8, Pages 10631-10642Publisher
OPTICAL SOC AMER
DOI: 10.1364/OE.26.010631
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Funding
- National Natural Science Foundation of China (NSFC) [61431003, 61601049, 61625104]
- Beijing University of Posts and Telecommunications [IPOC2017ZT08]
- BUPT Excellent Ph.D. Students Foundation
- Shanghai Jiao Tong University
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A pruning method of artificial neural network based nonlinear equalizer (ANN-NLE) is proposed and validated for single-sideband 4-ary pulse amplitude modulation (SSB-PAM4) in 1M/DD system. As a classifier, ANN is capable to form a complex nonlinear boundary among different classifications, which is considered as an appropriate way to mitigate the nonlinear impairments in optical communication system. In this paper, first, we introduce the operation principle of the traditional linear equalizer (LE) and NLE such as volterra equalizer (VE). Then we make an analogy among the LE, VE and ANN-NLE. After that, a novel pruning method is applied to reduce the complexity of ANN. The BER performance of ANN-NLE outperforms VE after fiber transmission. After 60 km fiber transmission, ANN-NLE decreases the BER by about one order of magnitude compared to VE. By implementing the proposed pruning method, the connections of ANN reduced by a factor of 10x while keeping the BER under the threshold of 3.8x10(-3). (C) 2018 Optical Society of America under the terms of the OSA Open Access Publishing Agreement
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