基于不平衡损耗非线性光纤环镜的双波长功率均衡实验研究

在波分复用（WDM）光纤网络中，存在很多因素会造成信道间的功率差异。针对波分复用光网络中功率均衡的需求，提出了利用带有不平衡放置的损耗结构的非线性光纤环镜（NOLM）来实现多信道功率均衡的技术方案。理论上分析了该方案利用自相位调制（SPM）效应产生均衡作用的基本原理，指出了该方案所能达到的最佳均衡指标。通过两波长10Gb／s幅度调制信道的实验，观察了不平衡损耗结构非线性光纤环镜（L-NOLM）的输出功率的变化过程，验证了它的均衡效果，当输入信道功率差异为7dB时，输出信道功率最大差异不超过2dB。该方案结构简单，无需解复用、复用，响应速度快，具有自适应均衡的特点。

Demonstration of Power Equalization Based on Unbalanced Loss Nonlinear Fiber Loop Mirror via Two-Channel Experiment

To meet the equalization requirements in wavelength-division multiplexing(WDM) networks,a channel power equalization method by using nonlinear fiber loop mirror(NOLM) with an unbalance loss is proposed.The operation principle based on self-phase modulation(SPM) effect is explained and the best achievable performance is given from the analysis results.The equalization function of the NOLM is demonstrated via a two-channel experiment with 10 Gb/s amplitude modulation.The variations of output power of the NOLM are observed and the results show that when the input power difference is 7 dB,no more than 2 dB of output power difference is achieved.This method is attractive because of the advantages of no requirement of demultiplexing and multiplexing,simple structure,self-adaptability and high response speed.