光纤通信系统中光信噪比的监测分析

Monitoring Analysis of OSNR in Optical Fiber Communication System

在新一代高数据传输速率的智能化光网络中,随着密集波分复用技术与可重构光分插复用器的使用,传统的带外光信噪比的监测方式已不再满足光性能监测技术的发展要求。文章根据测试技术原理,利用Optisystem软件建立仿真模型,分别对带外插值法以及带内的信号关断法与偏振光谱解析法进行评估。传统带外插值法的监测结果在动态密集波分复用网络中已不准确。信号关断法监测方法简单准确,但是监测时需要中断网络服务,并不适合实时监测。偏振光谱解析法虽然有些复杂,但是可适用于新一代光网络的实时动态监测。

In the new-generation intelligent optical networks with data transmission rates, with the applica- tions of dense wavelength division multiplexing （DWDM） and reconfignrable optical add-drop multiplexer （ROADM）, the monitoring techniques of traditional out-band optical signal-to-noise ratio （OSNR） be- come not so suitable for the monitoring development reqirements. Simulation models are set up in the soft- ware Optisystem according to the principle of the monitoring technology, and traditional out-band interpo- lation, in-band on-off signal, and in-band polarization analytical methods are evaluated respectively. The traditional out-band interpolation is not very accurate in the dynamic DWDM networks. The on-off signal method is simple and accurate but it would interrupt the service and so not suitable for the real-time moni- toring. The polarization analytical method is a bit complicated but applicable for real-time in-band OSNR monitoring in the next-generation optical networks.