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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10 Gb/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7 dB时,输出信道功率最大差异不超过2 dB。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。
In Wavelength Division Multiplexing (WDM) fiber networks, there are many factors that contribute to the power differences between channels. In order to meet the demand of power balance in WDM optical networks, a new scheme of multi-channel power equalization using non-linear optical fiber ring mirror (NOLM) with unbalanced loss structure is proposed. The basic principle of this scheme using the self-phase modulation (SPM) effect is theoretically analyzed, and the best equilibrium index that this scheme can achieve is pointed out. Through the experiments of two wavelength 10 Gb / s amplitude modulated channels, the change of output power of unbalanced lossy structure nonlinear fiber ring mirror (L-NOLM) was observed and its equalization effect was verified. When the input channel power difference was 7 dB, the maximum difference in output channel power does not exceed 2 dB. The scheme has the advantages of simple structure, no need of demultiplexing, multiplexing, fast response and self-adaptive equalization.