线路侧光模块CFP2-DCO在4G/5G网络建设中具有重要而广泛的应用, 而光信噪比(OSNR)指标是评估其性能的重要参数。光纤通信系统中的偏振模色散(PMD)及色度色散(CD)的干扰, 对OSNR性能有重要的影响, PMD及CD的干扰对系统OSNR造成的劣化即为PMD、CD的OSNR代价。探讨了OSNR的不同测试方法, 并针对通信设备制造商在实验室对OSNR进行测试的需求, 搭建了一种OSNR及PMD、CD干扰代价的自动化测试平台。利用该平台对CFP2-DCO的OSNR及PMD、CD的OSNR代价进行了测试, 并进一步测试得到叠加PMD、CD干扰后的OSNR代价及PMD、CD与OSNR的关系曲线。测试结果表明: PMD、CD的干扰越大, 通信系统对OSNR的要求越高, 因此应尽量降低系统的PMD、CD干扰, 从而可以优化系统性能, 提高通信质量。

The line side module CFP2-DCO has important and extensive application in 4G/5G network construct. Optical signal-to-noise ratio (OSNR) is an important parameter to evaluate the performance of the CFP2-DCO. The interference of polarization mode dispersion(PMD) and chromatic dispersion (CD) had important influence on the OSNR performance, the degradation of the OSNR induced by the PMD and CD is the OSNR penalty of PMD and CD. Different kinds of OSNR measurement methods are discussed. An automatic measurement platform on OSNR and PMD/CD penalty of the CFP2-DCO is introduced for the lab test requirement of communication equipment manufacturer. The OSNR and the PMD/CD penalty of the CFP2-DCO is tested using this platform. The PMD/CD penalty on the OSNR and the PMD/CD versus OSNR relation curve is further measured. The test results show that the OSNR requirement of the telecommunication system will be increased with the PMD/CD interference increasing. So, the PMD/CD interference should be decreased to optimize the system performance.