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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。
Fiber Bragg Grating (FBG) sensing networks are extremely rich in frequency and time domain networks, but a single multiplexing technology can only utilize resources on one hand and network resources can not be utilized efficiently. In order to make full use of sensor network resources, a new design of optical fiber sensing network based on WDM / TDM is proposed. The fiber bandwidth is first wavelength division multiplexed using arrayed waveguide gratings (AWGs), and then time division multiplexed for each channel of the wavelength division multiplexed. Based on this, the influences of shot noise and channel crosstalk on the measurement results are analyzed. Taking full advantage of the optical signal’s information in frequency and time domain, the sensor network has the potential to address and demodulate hundreds of raster signals. The network can achieve large capacity sensing, improve bandwidth utilization, reduce costs, with good application prospects.