中国激光, 2014, 41 (5): 0505004, 网络出版: 2014-04-09
PM-QPSK相干光通信系统中基于高阶统计矩的光信噪比监测方法的修正
Modified Optical-Signal-Noise-Ratio Monitoring Method Based on High Order Statistical Moment in PM-QPSK Coherent Optical System
光通信 光性能监测 光信噪比监测 高阶统计矩 偏振复用的正交相移键控 optical communications optical performance monitoring optical-signal-noise-ratio monitoring high order statistical moment polarization multiplexed quadrature phase shift ke
摘要
对于偏分复用的正交相移键控(PM-QPSK)相干接收系统,提出了一种修正的基于高阶统计矩的光信噪比(OSNR)监测方案,讨论了不同占空比调制格式的修正结果以及该修正结果对剩余色散(CD)和偏振模色散(PMD)的容忍度。搭建了112 Gb/s PM-QPSK系统仿真平台,对8 dB~26 dB范围内的光信噪比进行了测量,结果表明提出的修正方案对不同码型的监测误差均小于0.5 dB。并且当OSNR为14 dB时,在0.5 dB的监测误差范围内,对CD的容忍度约为2800 ps/nm,对一阶PMD的容忍度约为65 ps。因此,这种修正方案可用于PM-QPSK相干接收系统中带内实时OSNR监测,且计算复杂度小、不需要额外的监测设备。
Abstract
For polarization multiplexed quadrature phase shift keying (PM-QPSK) coherent receiver system, a modified optical-signal-noise-ratio (OSNR) monitoring method based on high order statistical moment is presented. The calibration value of different modulation formats and the tolerance of residual chromatic dispersion (CD) and polarization mode dispersion (PMD) for the modified method are investigated. The proposed method is verified in numerical simulations in 112 Gb/s PM-QPSK coherent receiver system, and the OSNR measurement error is within 0.5 dB for all modulation formats with a wide range from 8 dB to 26 dB. The method also has a CD tolerance of 2800 ps/nm and a first-order PMD tolerance of 65 ps if the acceptable error is set to 0.5 dB when real OSNR is around 14 dB, and it is available in real time and in-band OSNR measurement of PM-QPSK coherent receiver system with lower computation complexity and without the requirement of extra monitoring device.
张磊, 张晓光, 席丽霞, 赵东鹤, 唐先锋, 张霞. PM-QPSK相干光通信系统中基于高阶统计矩的光信噪比监测方法的修正[J]. 中国激光, 2014, 41(5): 0505004. Zhang Lei, Zhang Xiaoguang, Xi Lixia, Zhao Donghe, Tang Xianfeng, Zhang Xia. Modified Optical-Signal-Noise-Ratio Monitoring Method Based on High Order Statistical Moment in PM-QPSK Coherent Optical System[J]. Chinese Journal of Lasers, 2014, 41(5): 0505004.