Optical receiver modules play an important role in receiving signals from the Fiber Bragg Grating (FBG) sensors used for monitoring in civil structures, power facilities, and other sensing applications. When multiple sensors are used, more photo diodes receive optical signals; thin-film beam splitters with polarization characteristics are therefore used to reduce the size of the optical receiver module. Using a reflective semiconductor optical amplifier (R-SOA) with polarization characteristics in a sensing system with an FBG sensor, a structure that is less sensitive to polarization was developed by packaging a quad optical receiver module. A stabilization of ±4.67% was achieved using the dual optical receiver module in polarization and of ±1.20% with the quad optical receiver module in polarization.

中文翻译：

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基于薄膜分束器的偏振不敏感光接收模块

光接收器模块在接收来自用于监测土木结构、电力设施和其他传感应用的光纤布拉格光栅 (FBG) 传感器的信号方面发挥着重要作用。当使用多个传感器时，更多的光电二极管接收光信号；因此使用具有偏振特性的薄膜分束器来减小光接收器模块的尺寸。在具有 FBG 传感器的传感系统中使用具有偏振特性的反射式半导体光放大器 (R-SOA)，通过封装四光接收器模块开发了一种对偏振不太敏感的结构。在偏振中使用双光接收器模块实现了 ±4.67% 的稳定性，在偏振中使用四光接收器模块实现了 ±1.20% 的稳定性。