100Gb/sPM-QPSK相干光接收系统中改进的带内OSNR监测方法

为保证偏分复用正交相移键控(PM-QPSK)相干光通信系统的传输性能, 提出了一种改进的基于高阶统计矩的光信噪比监测方案.该方案针对不同调制格式给出了不同的修正值, 因此对调制格式透明.在搭建的100 Gb/s PM-QPSK相干接收系统中对该方案进行了数值仿真, 结果表明：当光信噪比在5～25 dB的范围内,不同占空比调制码型的监测误差均小于0.5 dB;光信噪比参考值为14 dB时, 在0.5 dB的监测范围内, 色散容忍度为2 400 ps/nm, 对一阶偏振模色散的容忍度为62 ps.

Abstract

For protecting the transmission performance of the Polarization Multiplexed-Quadrature Phase Shift Keying (PM-QPSK) optical transmission system, an improved Optical-Signal-Noise-Ratio(OSNR) monitoring method based on high order statistical moment was proposed. By using different calibrations, this method is transparent for modulation formats. Using numerical simulation the proposed method is verified in 100 Gb/s PM-QPSK coherent receiving system. In the range of 5~25 dB OSNR, the OSNR measurement error is within 0.5 dB for the modulation formats with different duty cycle, and the system has 2 400 ps/nm of chromatic dispersion tolerance and 62 ps of first-order polarization mode dispersion tolerance for 14 dB OSNR with measurement error in 0.5 dB. The improved monitoring method has such advantages of small monitoring error and high tolerance to chromatic dispersion and first-order polarization mode dispersion.

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王芳, 张霞. 100Gb/sPM-QPSK相干光接收系统中改进的带内OSNR监测方法[J]. 光子学报, 2014, 43(12): 1206003. WANG Fang, ZHANG Xia. An Improved In-band OSNR Monitoring Method in 100Gb/s PM-QPSK Optical Coherent Receiving System[J]. ACTA PHOTONICA SINICA, 2014, 43(12): 1206003.

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