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提出了一种基于Gires-Tournois腔的非对称型光学交错梳状滤波器。理论上,通过调整两个波片的偏振延迟和Gires-Tournois腔的反射率,可以获得任意光谱带宽比的非对称型交错梳状滤波器件。分别对输出带宽比M=1∶3和M=1∶7的非对称型交错梳状滤波器的输出进行了数值模拟,确定两个波片的延迟和Gires-Tournois腔的反射率。分别设计和研制出了输出光谱带宽比M=1∶3和M=1∶7的器件,其中M=1∶3器件的两个输出通道的3 dB带宽分别为0.385 nm和1.161 nm,比值为M=1∶3.02,M=1∶7器件的两个输出通道的3 dB带宽分别为0.191 nm和1.331 nm比值M=1∶6.75。实验结果(光谱带宽比)与设计要求基本符合。
An asymmetric optical interleaving comb filter based on Gires-Tournois cavity is proposed. Theoretically, by adjusting the polarization delay of two wave plates and the reflectivity of the Gires-Tournois cavity, an asymmetric interleaved comb filter with an arbitrary spectral bandwidth ratio can be obtained. The outputs of asymmetric interleaved comb filters with output bandwidth ratios M = 1: 3 and M = 1: 7 were numerically simulated to determine the delay of both wave plates and the reflectivity of the Gires-Tournois chamber. The devices with output spectral bandwidth ratios of M = 1: 3 and M = 1: 7 were designed and fabricated respectively. The 3 dB bandwidths of the two output channels of M = 1: 3 devices were 0.385 nm and 1.161 nm respectively, M = 1: 3.02, M = 1: 7 The 3 dB bandwidths of the two output channels of the device are respectively 0.191 nm and 1.331 nm with a ratio of M = 1: 6.75. Experimental results (spectral bandwidth ratio) and design requirements are basically in line.