基于光纤环形腔衰荡光谱的偏振测量

芦恒; 王芳; 王旭; 刘玉芳

doi:doi:10.3788/gzxb20174609.0930004

光子学报, 2017, 46 (9): 0930004, 网络出版: 2017-10-16

基于光纤环形腔衰荡光谱的偏振测量

Polarization Measurement Based on Fiber Loop Cavity Ring-down Spectroscopy

论文大纲

芦恒 ^*王芳王旭刘玉芳

作者单位

河南师范大学电子与电气工程学院，河南新乡 453007

光纤环衰荡光谱掺铒光纤放大器耦合器偏振测量 Fiber loop ring-down Spectroscopy EDFA Coupler polarization measurement

摘要

针对传统偏振测量较难同时实现高灵敏度和较好稳定性的问题，提出了一种采用光纤环形腔衰荡光谱技术进行偏振测量的方法，并进行了实验证明.对比分析了掺铒光纤放大器放置在环形腔的内部和外部对脉冲曲线和脉冲数量的影响.在掺铒光纤放大器中使用长度为2 m的低增益和低噪声掺铒光纤来减少波形失真并补偿环形腔的内部衰减.利用光纤环形腔衰荡光谱系统对偏振角进行测量，通过记录分析环形腔中光脉冲的衰减时间得到偏振角的变化.结果表明：偏振角和衰减时间在0°~90°的范围内满足良好的线性关系，光纤环形腔衰荡光谱系统的灵敏度和拟合曲线的相关系数分别为4.05 μs/°和0.999 6，最大灵敏度误差为0.027 3 μs/°.通过10次重复实验，选取六组数据进行拟合得到系统的平均再现性误差为0.030 8，重复性良好，可用于旋光溶液测量，也为光纤径向应力双折射特性和光纤激光器的偏振态测量提供了参考.

Abstract

A polarization measurement method employing a Fiber Loop Ring-Down Spectroscopy (FLRDS) system is proposed and experimentally demonstrated. The influence of an Erbium-Doped Fiber Amplifier (EDFA) placed inside and outside the fiber ring on the pulse curve and the number of pulse peaks in the annular cavity is analyzed. A length of 2 m low-gain and low-noise erbium-doped fiber in EDFA is used to reduce waveform distortion and compensate for the attenuation of the cavity. Measurement of polarization angle θ was performed with the FLRDS system, and the change of θ is gained by recording the ring-down time τ of light pulse in the fiber loop. Results indicate that a good linear relationship is met between θ and τ in the range of 0°~ 90°. The sensitivity of the FLRDS system and the correlation coefficient of the fitted curve are 4.05 μs/° and 0.999 6, respectively. The maximum sensitivity error is 0.027 3. Through ten repeated experiments, six sets of data were selected to fit, and the average reproducibility error of the system was 0.030 8, and the repeatability was good, so it can be used in optical rotatory solution measurement, and also provides a reference for fiber radial stress birefringence and polarization state measurement of fiber lasers.

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芦恒, 王芳, 王旭, 刘玉芳. 基于光纤环形腔衰荡光谱的偏振测量[J]. 光子学报, 2017, 46(9): 0930004. LU Heng, WANG Xu, WANG Fang, LIU Yu-fang. Polarization Measurement Based on Fiber Loop Cavity Ring-down Spectroscopy[J]. ACTA PHOTONICA SINICA, 2017, 46(9): 0930004.

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