强度可控的保偏光纤内弱偏振耦合点的产生及其应用研究

Generation of Intensity-controllable polarization coupling points (ICPCP) in polarization maintaining fiber (PMF) is proposed and would be realized by UV irradiation and electro-discharge, which could introduce the asymmetric refractive index modulation. ICPCPs based interferometers in PMF would be designed and optimized to realize a new optical fiber sensor net, especially PMF gratings used as ICPCPs. The research would be helpful to understand the mechanism of polarization coupling and PMF based distributed fiber sensors.

本项目旨在开展保偏光纤内引入强度可控的弱偏振耦合点的机理和方法研究。利用紫外曝光和电极放电两种手段，实现对保偏光纤等效折射率的非对称调制，从而产生可控弱偏振耦合点。探索利用弱偏振耦合点在传统和特种保偏光纤内构造级联干涉仪，重点开展保偏光纤光栅作为偏振耦合点的方案，构建新型多功能传感网络。本项目的开展对于深入理解保偏光纤偏振耦合的机理和利用保偏光纤偏振耦合构造新型分布式光纤传感器具有重要意义。

本项目旨在开展保偏光纤内引入强度可控的弱偏振耦合点的机理和方法研究。利用紫外曝光手段实现对保偏光纤等效折射率的非对称调制，产生了-59dB和-56dB的偏振耦合点；利用电极放电手段实现对保偏光纤内部结构旋转，产生了强度可控（从~-62.8dB到~-40.5dB）弱偏振耦合点。探索利用弱偏振耦合点在保偏光纤内构造级联干涉仪，构建温度传感网络。本项目的开展对于深入理解保偏光纤偏振耦合的机理和利用保偏光纤偏振耦合构造新型分布式光纤传感器具有重要意义。