提出了一种波长扫描与时分复用相结合的光纤光栅阵列波长解调系统,通过对波长扫描光信号的脉冲调制,实现了对树状拓扑结构式大容量光纤光栅阵列的波长解调。搭建了光纤光栅阵列波长解调系统,验证了其对高复用度光纤光栅阵列的波长解调能力,测试了光纤光栅阵列波长解调性能。结果表明,该系统实现了传感器阵列各阵段光纤光栅的波长识别与解调,波长测量精度为2.5 pm,短时间内测量波动在±2 pm之间。

A wavelength demodulation system combined wavelength scanning with time division multiplexing for fiber Bragg grating(FBG)array is proposed. Wavelength demodulation for a large capacity FBG array with a tree topology structure is realized by the pulse modulation of the optical signal with a wavelength scanning. The FBG array wavelength demodulation system is is built and the ability of wavelength demodulation for FBG arrays with a high degree of reusability is verified. The permanence of the wavelength demodulation for FBG array is tested. The experimental results show that this system can achieve the identification and demodulation of the wavelength for the FBG in each subarray with the wavelength accuracy of 2.5 pm and the fluctuation range is within ±2 pm.