使用光学相位共轭对正交频分复用超信道进行光纤非线性补偿。

Fiber nonlinearity compensation for OFDM super-channels using optical phase conjugation.

作者信息

Du Liang B, Morshed Mohammad Monir, Lowery Arthur J

机构信息

Centre for Ultrahigh bandwidth Devices for Optical Systems (CUDOS), Department of Electrical & Computer Systems Engineering, Monash University, Clayton, VIC 3800, Australia.

出版信息

Opt Express. 2012 Aug 27;20(18):19921-7. doi: 10.1364/OE.20.019921.

DOI:10.1364/OE.20.019921

PMID:23037044

Abstract

We experimentally demonstrate that mid-link optical phase conjugation (OPC) effectively compensates fiber nonlinearity in coherent optical OFDM super-channels. The OPC was produced by pump × subcarrier degenerate four-wave-mixing in a 1-km highly nonlinear fiber. The nonlinear threshold for the 10 × 80-km 604.7-Gb/s 16-QAM test system was increased by 4.8 dB. The performance at the optimum power was only improved by 0.2 dB because the OPC module produces a 1.6 dB penalty for the back-to-back system. FWM theory shows that the 'noise' processes of OPC modules utilizing χ3 nonlinearities could be reduced by increasing the pump power, which will improve back-to-back performance with the OPC module.

摘要

我们通过实验证明，链路中间光学相位共轭（OPC）能有效补偿相干光正交频分复用（OFDM）超信道中的光纤非线性。OPC是由泵浦×子载波简并四波混频在1公里高非线性光纤中产生的。对于10×80公里、604.7Gb/s、16正交幅度调制（QAM）测试系统，其非线性阈值提高了4.8分贝。由于OPC模块给背对背系统带来1.6分贝的代价，所以在最佳功率下性能仅提高了0.2分贝。四波混频（FWM）理论表明，通过增加泵浦功率可以减少利用χ3非线性的OPC模块的“噪声”过程，这将改善使用OPC模块时的背对背性能。