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Effects of Rayleigh backscattering on distributed feedback fiber laser sensors

机译:瑞利反向散射对分布式反馈光纤激光传感器的影响

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Rayleigh backscattering induces mode hopping of DFB fiber lasers in the sensor array, and the critical length related to Rayleigh backscattering limits the size of DFB fiber laser sensor networking. Based on three-mirror cavity model, the critical length for DFB fiber lasers are derived. It increases nearly exponentially with the coupling coefficient for the ideal π-shifted DFB fiber lasers. While the reflectivity of the sub-FBG at lasing wavelength is the main factor to resist Rayleigh backscattering for a non-ideal DFB fiber laser. The corresponding experiments have been carried out, and the results agree with the predictions.
机译:瑞利反向散射在传感器阵列中引起DFB光纤激光器的模式跳变,与瑞利反向散射有关的临界长度限制了DFB光纤激光传感器网络的大小。基于三镜腔模型,推导了DFB光纤激光器的临界长度。对于理想的π位移DFB光纤激光器,其耦合系数几乎成倍增加。次FBG在激光波长下的反射率是抵抗非理想DFB光纤激光器的瑞利背向散射的主要因素。已经进行了相应的实验,结果与预测结果吻合。

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