八进制调制DWDM系统非线性效应仿真研究

杜建新; 许悦; 滕之禹

doi:doi:10.3969/j.issn.1007-5461.2017.06.013

量子电子学报, 2017, 34 (6): 735, 网络出版: 2017-12-08

八进制调制DWDM系统非线性效应仿真研究

Nonlinear effect simulation of 8-ary modulation DWDM system

论文大纲

杜建新 ^*许悦滕之禹

作者单位

南京邮电大学光电工程学院, 江苏南京 210023

摘要

为提高光纤通信系统的频谱利用率,搭建了八进制幅度差分相移键控(8APSK)和八进制差分相移键控(D8PSK)密集波分复用(DWDM)系统。仿真结果表明：当探测信道为8APSK,最佳入射平均光功率随其幅度调制指数的增大而明显变大。不管是8APSK还是D8PSK调制,入射平均光功率取最佳值时,四波混频噪声对系统性能的影响并不大。然而当其超过最佳值,四波混频噪声随入射平均光功率的增加对系统性能的影响快速增加。对于所讨论的DWDM系统,幅度调制指数优化的8APSK信号传输性能明显优于D8PSK,因为前者对总的非线性效应有更好的容忍度。

Abstract

In order to improve the spectrum utilization of fiber communication system, the dense wavelength division multiplexing (DWDM) system of 8-level amplitude and differential phase-shift keying (8APSK) and differential 8-level phase-shift keying (D8PSK) are set up. Simulation results show that when the probe channel is 8APSK, the optimal incident average optical power increases with increasing of 8APSK amplitude modulation index. Whether it is 8APSK or D8PSK modulation, four-wave mixing noise has little influence on the system performance when the incident average optical power is optimal. While it exceeds the optimal value, the influence increases rapidly. For the discussed DWDM system, the transmission performance of 8APSK signal with amplitude modulation index optimization is obviously better than that of D8PSK, which is mainly attributed to the better tolerance of total nonlinearities for the former.

参考文献

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杜建新, 许悦, 滕之禹. 八进制调制DWDM系统非线性效应仿真研究[J]. 量子电子学报, 2017, 34(6): 735. DU Jianxin, XU Yue, TENG Zhiyu. Nonlinear effect simulation of 8-ary modulation DWDM system[J]. Chinese Journal of Quantum Electronics, 2017, 34(6): 735.

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