光纤空气隙法布里-珀罗标准具透射谱线型研究  

Research on the Lineshape of Transmission Spectra from Fiber Air Gap Fabry-Perot Etalons

作　　者：汪巧云 杨静 高欣宇 钟宇民 孟彦龙 毛邦宁 裘燕青 李裔 Wang Qiaoyun;Yang Jing;Gao Xinyu;Zhong Yumin;Meng Yanlong;Mao Bangning;Qiu Yanqing;Li Yi(College of Optical and Electronic Technology,China Jiliang University,Hangzhou,Zhejiang 310018,China)

机构地区：[1]中国计量大学光学与电子科技学院,浙江杭州310018

出　　处：《光学学报》2021年第4期124-130,共7页Acta Optica Sinica

基　　金：浙江省自然科学基金(LY16F050006);浙江省大学生科技创新活动计划(2020R409042)。

摘　　要：空气隙法布里-珀罗(F-P)标准具是一种常见的光无源器件,其作为滤波器广泛应用于光通信、光电测量和光传感领域。根据经典干涉理论,F-P标准具的光谱为周期出现的洛伦兹峰。但在对F-P标准具透射谱的校准与拟合过程中,发现其透射峰存在左右不对称以及展宽现象,导致使用经典洛伦兹公式的拟合误差较大。通过分析透射峰不对称度和展宽间的关系,并考虑光纤准直器的发散角以及F-P标准具的装配误差因素,提出了一种基于传统F-P干涉理论并融合发散角与入射偏角的多峰叠加拟合公式。使F-P透射谱的拟合方差提高到0.008、重合精度为0.9998,与基于洛伦兹线型的拟合结果相比提高了近15倍。该研究提供了一种对光纤空气隙F-P标准具透射谱精确拟合的方法,并对其设计以及装配工艺有着重要的指导意义。Air gap Fabry-Perot(F-P)etalon is a common passive optical device,which,as a filter,has been widely used in optical communications,photoelectric measurement,and optical sensing.Based on the classical multi-beam interference theory,the spectrum of an F-P etalon has periodical Lorentz peaks.However,during the calibration and fitting of the transmission spectrum of a fiber air gap F-P etalon,left-right asymmetry and broadening of the transmission peaks are found.These unexpected phenomena lead to a large fitting error if the classical Lorentz formula is employed.In this study,we firstly analyze the relationship between peak asymmetry and broadening,and then investigate the influence of the divergence angle of a fiber collimator and the assembly error of the etalon.Finally,taking the divergence angle and the incident deflection angle into consideration,we propose a multi-peak superposition fitting formula based on the traditional F-P interference theory.With the new formula,a fitting variance of 0.008 and a coincident accuracy of 0.9998 are achieved for the F-P transmission spectra.Compared with the fitting results of Lorentz lineshape,the fitting accuracy is improved by about 15 times.In conclusion,an accurate fitting method for the transmission spectra of fiber air gap F-P etalons is provided,which has important guiding significance for the design and assembly of the F-P etalons.

关 键 词：测量 光纤空气隙法布里-珀罗标准具 多峰拟合 偏度 光谱展宽 

分 类 号：O433.4[机械工程—光学工程]