为了在相干象增强系统中提高象的对比度，突出所需用的信号，采用了偏振滤波器。
In order to improve the image contrast and to single out the desirable signals in a coherent image enhancement system, a polarizing filter was used.
从理论上分析了利用光纤环形镜（FLM）中的偏振耦合效应作为滤波器，对掺铒光纤放大器（EDFA）实现增益平坦化的方法。
The method of erbium-doped fiber amplifier(EDFA) gain flattening using a fiber loop mirror(FLM) acting as a wavelength filter was analyzed in theory.
提出了一种基于模拟双折射模块的可调谐偏振光干涉型密集波分复用滤波器(DWDM)的新结构。
A new structure of tunable polarization interference dense wavelength division multiplexing (DWDM) filter based on the analog birefringent module is presented.
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