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112Gb/s PM-QPSK系统仿真平台,对8dB^26dB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0.5dB。并且当OSNR为14dB时,在0.5dB的监测误差范围内,对CD的容忍度约为2800ps/nm,对一阶PMD的容忍度约为65ps。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。
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 riB, 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.
出处
《中国激光》
EI
CAS
CSCD
北大核心
2014年第5期119-123,共5页
Chinese Journal of Lasers
基金
国家自然科学基金(61205065)
山东省自然科学基金项目(ZR2010FM043)
上海交通大学区域光纤通信网与新型光通信系统国家重点实验室开放基金(2013GZKF031310)
关键词
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
highorder statistical moment
polarization multiplexed quadrature phase shift keying
