基于光纤布拉格光栅波/时分复用传感网络研究

Study of Fiber Bragg Grating Sensor System Based on Wavelength-Division Multiplexing/Time-Division Multiplexing

在频率和时域网络中光纤布拉格光栅(FBG)传感网络的资源极其丰富,但单一的复用组网技术只能利用其一方面的资源,网络资源的利用率不高。为了充分利用传感网络资源,提出了一种新型的基于波分复用(WDM)/时分复用(TDM)的网络复用技术的光纤传感网络设计方案。首先将光纤带宽利用阵列波导光栅(AWG)进行波分复用,然后对波分复用的每一信道进行时分复用。在此基础上分析了网络中的散粒噪声和信道串扰对测量结果的影响。充分利用了光信号在频率和时域上的信息,使传感网络具有了寻址和解调数百个光栅信号的潜在能力。该网络可实现超大容量传感,提高带宽利用率,降低成本,具有很好的应用前景。

The available resources of fiber bragg grating（FBG）sensor network is extremely rich in the frequency and time domain.A network employing single multiplexing technology can only use the resources on the one hand and the utilization ratio of network resources is low.In order to improve the efficiency of sensor network,a new type of FBG sensor network based on wavelength-division multiplexing/time-division multiplexing（WDM/TDM）techniques is designed.The fiber bandwidth is employed to WDM with arrayed waveguide grating（AWG）,and then to TDM on each WDM channel.The analysis results show that the system performance is affected by shot noise and crosstalk.Making full use of optical wavelength and time domain information,the system shows the potentialities of interrogating and demodulating signals from several hundreds of FBG sensors.The sensor network can achieve a large capacity,increase bandwidth utilization ratio,reduce costs and have a good application prospects in the future.