新型光学梳状滤波器输出光谱响应研究*

摘要

A novel optical Interleaver is proposed by using 2×2 and 3×3 fiber couplers,and the output ex-pression of Interleaver is obtained by using optical fiber transmission coupling theory.Through numerical simulation,the influence of the coupling ratios of the optical fiber coupler on the novel optical Interleaver is analyzed,then a reasonable value range is achieved.The results show that flat output waveform is achieved when the difference between the interference arms and coupler splitting ratio meet some value,and between 3 dB points,odd channels and even channels have 15 GHz passband and 60 GHz passband.Compared with the conventional Interleaver,the novel Interleaver has higher bandwidth utilization efficiency.%提出了一种由2×2光纤耦合器和不同的3×3光纤耦合器构成的新型光学梳状滤波器，运用光纤传输理论和矩阵理论，得到该器件的输出表达式。通过数值模拟分析了光纤耦合器的耦合比对该器件性能的影响，给出了合理的取值范围。结果表明：当各个干涉臂长差和耦合比满足一定值要求时，可得到平坦的输出光谱，且器件奇偶信道在3 dB透过带宽分别满足15 GHz和60 GHz的带宽要求，该滤波器较传统的等带宽交错滤波器有更高的带宽利用率。