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中文摘要：
提出了由1个3×3和1个2×2单模光纤耦合器级联组成的反射式光纤梳状波长滤波器，给出了其基本结构形式，并对其特性进行了分析。分析结果表明：当组成滤波器的2个耦合器的分光比和光纤干涉臂之差取一些定值时，可以使滤波器产生性能良好的梳状输出谱图。与采用3个耦合器串联而成的级联Math—Zehnder干涉仪（MZI）相比，该器件可以实现相同的功能，但只用到2个耦合器，并且在实际制作时可以对耦合器的分光比进行准确的监测和控制。研制出了具有输出峰间隔为1．6nm、近似于方波的波长交错滤波器，理论与实验结果基本相符。
英文摘要：
An all-fiber reflected comb-filter having almost rectangular wavelength response has been demonstrated. The device consists of an asymmetric Mach-Zehnder interferometer （MZI） with a 2 × 2 and a 3 × 3 single mode fiber coupler. The relationships between the splitting ratios of the couplers, the length difference of interference arms and the intensity transmission spectrum were discussed. It is theoretically and experimentally confirmed that a passband flattened and stopband broadened transfer spectral response can be achieved when the length difference of interference arms and coupling coefficient of the couplers are given by a certain value in order. With this configuration,the coupling ratio of couplers can be controlled accurately because light interference effect can be sheered away, and the proportion of the length differences can be controlled accurately in the course of fabricating interleaver. A novel structure of interleaver is fabricated with fused biconical taper technics in experiment. The experiment results are in good agreement with the theoretical analysis.
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