A planar lightwave circuit-based multi-channel arrayed waveguide grating (AWG) is used as a critical part of the fiber Bragg grating (FBG) interrogation unit and designed to be integrated into the fiber grating sensing system. We designed and fabricated a high-performance, 40 channels AWG in the device, enabling whole C-band wavelength demodulation while maintaining high-measurement resolution. The AWG was designed to have 100-GHz channel spacing; the channel crosstalk was measured to be −45 dB. An AWG-based FBG interrogation system was built to analyze the characteristics of our unit. The testing result shows that our system has the capability of demodulating wavelength from 1526.438 to 1563.863 nm with wavelength accuracy within ±10 pm; the wavelength resolution is measured to be 1 pm. Our testing result confirms that an AWG-based FBG interrogator is an excellent choice for FBG sensing systems.

中文翻译：

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基于阵列波导光栅的光纤布拉格光栅传感器询问器性能分析

基于平面光波电路的多通道阵列波导光栅 (AWG) 被用作光纤布拉格光栅 (FBG) 询问单元的关键部分，旨在集成到光纤光栅传感系统中。我们在设备中设计并制造了一个高性能的 40 通道 AWG，可在保持高测量分辨率的同时实现整个 C 波段波长解调。AWG 设计为具有 100 GHz 的信道间隔；测得的通道串扰为 -45 dB。建立了一个基于 AWG 的 FBG 询问系统来分析我们单元的特性。测试结果表明，我们的系统具有1526.438-1563.863 nm波长的解调能力，波长精度在±10 pm以内；测得的波长分辨率为 1 pm。