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为改善全光纤波长交错滤波器(Interleaver)的输出特性,提出了一种将带自反馈光纤谐振腔的2×2光纤耦合器作为马赫-曾德尔干涉仪(MZI)输出端耦合器的新型全光纤MZI-Interleaver,推导了该器件的输出表达式,并进行了数值模拟分析.分析结果表明:改进后的MZI-Interleaver透射波形更加接近于方波,阻带抑制和过渡带滚降特性明显加强;与传统的光纤谐振腔辅助MZI-Interleaver相比,在考虑传输损耗的情况下,改进后的MZI-Interleaver相干涉的两束光信号不存在幅度差异,因此降低了传输损耗对全光纤MZI-Interleaver消光特性的影响.
In order to improve the output characteristics of an all-fiber Interleaver, a novel 2 × 2 fiber coupler with self-feedback fiber resonator is proposed as a Mach-Zehnder interferometer (MZI) output coupler Optical fiber MZI-Interleaver, the output expression of the device is deduced and the numerical simulation is carried out.The analysis results show that the improved MZI-Interleaver transmission waveform is closer to the square wave, the rejection of stop band and the roll-off of transition band are obviously enhanced Compared with the conventional fiber-optic resonator-assisted MZI-Interleaver, considering the transmission loss, there is no amplitude difference between the two modified MZI-Interleaver coherent interfering signals, so the transmission loss is reduced. Effect of Interleaver extinction characteristics.