为改善全光纤3×3光学梳状滤波器(Interleaver)的输出特性,详细推导了其输出表达式,通过分析和优化,提出了新的结构参数。计算结果表明:相对于以往的全光纤3×3光学梳状滤波器而言,利用优化后的结构参数设计的全光纤3×3光学梳状滤波器,不仅降低了器件的制作难度,而且在串扰特性、信道隔离度、阻带抑制、通带平顶度以及过渡带滚降等特性方面得到了明显改善,信道间功率旁瓣降低了约16 d B。最后进行了实验研究,实验所得结果与理论结果相吻合。 In order to improve the output characteristic of the all-fiber 3 × 3 optical interleaver, the output expression is deduced in detail. Through analysis and optimization, new structural parameters are proposed. The calculation results show that, compared with the conventional all-fiber 3 × 3 optical comb filter, the all-optical 3 × 3 optical comb filter designed with the optimized structural parameters not only reduces the difficulty of device fabrication, Crosstalk characteristics, channel isolation, stopband rejection, passband flatness, and transitional band rolloff have been significantly improved. The power sidelobes between channels have been reduced by about 16 dB. Finally, the experimental research is carried out. The experimental results are consistent with the theoretical results.