Laser Wavelength Estimation Method Based on a High-Birefringence Fiber Loop Mirror

A simple method for the estimation of the wavelength of a fiber laser system is proposed. The method is based on the use of a high-birefringence-fiber loop mirror(HBFLM).The HBFLM exhibits a periodic transmission/reflection spectrum whose spectral characteristics are determined by the length and temperature of the high-birefringence fiber(HBF).Then,by the previous characterization of the HBFLM spectral transmission response,the central wavelength of the generated laser line can be estimated.By using a photodetector,the wav.elength of the laser line is estimated during an HBF temperature scanning by measuring the temperature at which the maximum transmitted power of the HBFLM is reached.The proposed method is demonstrated in a linear cavity tunable Er/Yb fiber laser.This method is a reliable and low-cost alternative for laser wavelength determination in short wavelength ranges without the use of specialized and expensive equipment.

基于温度补偿高双折射光纤环镜的边缘滤波解调方法

提出了一种光纤光栅传感解调新方法。系统由1个3dB耦合器、1个传感光纤布喇格光栅、1个双折射光纤环镜和1个探测器构成,高双折射光纤环镜作为边缘滤波器。光纤光栅波长的线性解调带宽为3.6nm。对双折射光纤环镜的温度补偿进行了实验研究,实验表明,封装的高双折射光纤环镜能够补偿高双折射光纤环镜的温度漂移。补偿前的高双折射光纤环镜波长随温度漂移为2.3nm/℃,补偿后的双折射光纤环镜波长随温度漂移为0.005nm/℃,远小于未补偿的双折射光纤环镜波长随温度漂移。

基于LPFG和HBF环镜的温度和应变同时测量

利用长周期光纤光栅(LPFG)和高双折射光纤(HBF)环镜的谐振波长对温度和应变的灵敏度差异,设计了温度和应变同时区分测量系统。在理论分析的基础上,分别测定了LPFG以及HBF环镜谐振波长对温度和应变的灵敏度系数,构建相关系数矩阵方程,实现温度和应变区分测量。实验测得该系统的温度和应变测量精度分别为±0.36℃和±13.7με。利用温度与应变的同时测量数据以及温度实验数据,解析到应变的变化曲线,验证了方法的准确性。实验结果表明,本文方案能较好地解决测量中存在的应变和温度间的交叉敏感问题,有效地提高了系统的测量精度。