The Interrogation for Fiber Grating Sensors Based on the Linear InGaAs Photodiode Array
基于线阵InGaAs光电二极管阵列的光纤光栅传感解调

Based on the linear indium gallium arsenide (InGaAs) photodiode array and volume phase grating (VPG), a interrogative system of the fiber Bragg grating (FBG) sensors is designed by use of the wavelength division multiplexing (WDM) and spatial division multiplexing (SDM) technology. The performance tests show that the interrogation system can be used to interrogate the FBG sensor array with wavelength bandwidth 42 nm,SNR of 30 dB, wavelength shift accuracy of ±15 pm and power accuracy of about ±0.3 dB. The interrogative system has small size, and high interrogation speed, and it shows a good prospect.