基于AWG的波分/时分复用FBG传感器网络研究

Study on WDM/TDM distributed FBG sensor networks based on AWG

为了充分利用传感器网络在频域和时域上的丰富资源,提出了一种采用WDM/TDM的网络复用技术的新型分布式FBG传感器网络设计方案。将FBG传感器利用阵列波导光栅(AWG)进行波分复用,并利用程控光开关对波分复用信道中的每一个FBG传感器进行时分复用。网络中的传感器数量可达几百只。以可调法布里—珀罗(F-P)滤波器和数字信号处理器为核心的解调模块,通过布设的参考FBG能够对F-P滤波器特征曲线进行实时校正,提高了解调准确度。传感过程实现了自动化。该传感器网络可以对矿井、地下隧道等危险环境进行实时温度测量、预警,具有很好的应用前景。

A new type of distributed FBG sensor networks using WDM/TDM technology has been designed. The FBG sensor is employed by Wavelength Division Multiplexing with arrayed waveguide grating （AWG）. TDM is employed on each AWG channel. The rich resources of FBG sensor networks in the frequency and time-domain is fully utilized. As many as hundreds of FBG sensors can be used in the networks. A higher accuracy has been realized in the wavelength demodulation centering on Fabry-Perot（F-P） filter and digital signal processors. Multireference FBGs on each channel of AWG are set up for real-time calibration of characteristic curve of the transmitting wavelength and control-voltage of the tunable F-P filter. The entire sensor process has achieved automatic control. The sensor networks can be applied in the temperature measuring and warning of the mine and underground tunnel. It has good application prospects in the future.