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Elimination of a back-reflected TE mode in a TM-mode optical isolator with a Mach-Zehnder interferometer

机译:使用Mach-Zehnder干涉仪消除TM模式光隔离器中的后向反射TE模式

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Elimination of a back-reflected TE mode traveling in a TM-mode optical isolator was investigated. The optical isolator had a Mach-Zehnder interferometer that included a polarization-dependent reciprocal phase shifter in one of the arms. The reciprocal phase shift was achieved by an optical path difference between the two arms. By adjustment of the length of the reciprocal phase shifter, the interferometer prevented the back-reflected TE mode from coupling into an input port of the isolator. An extinction ratio of more than 18 dB was obtained against the back-reflected TE mode at a wavelength of 1.55 μm.
机译:研究了消除在TM模式光隔离器中传播的后向反射TE模式。该光隔离器具有一个马赫曾德尔干涉仪,该干涉仪的一只臂中包括一个偏振相关的倒相器。双向相移是通过两个臂之间的光程差实现的。通过调整往复式移相器的长度,干涉仪防止了背反射的TE模式耦合到隔离器的输入端口。在波长为1.55μm的情况下,相对于背反射TE模式的消光比大于18 dB。

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