红外与毫米波学报2021，Vol.40Issue(2)：243-247,5.DOI:10.11972/j.issn.1001-9014.2021.02.015
基于激光调频连续波正反向调谐色散对消方法
The method of dispersion cancellation based on the forward and reverse tuning of a laser frequency-modulated continuous wave system
摘要
Abstract
To reduce the dispersion mismatch effect on FMCW measurements,a method of eliminating dispersionmismatch by the forward and reverse tuning of an external cavity tunable laser is proposed. When the external cav-ity tunable laser is combined with an optical fiber path,the system produces a dispersion mismatch effect,which is manifested as peak broadening and shifting of the target signal. The ranging value changes with the increase in the tuning bandwidth,resulting in measurement instability. To solve this problem,the paper studies the system dispersion mismatch characteristics of the external cavity tunable laser in forward and reverse tuning. The results show that the dispersion trend is a symmetrical distribution of the forward and reverse tuning. The paper establish-es the dispersion mismatch model of the forward and reverse tuning system. On this basis,dispersion cancellation is realized by forward and reverse tuning of the external cavity laser. This method does not require calibration of the dispersion coefficient of the system in advance nor cyclic iterative compensation. A single measurement can complete the dispersion compensation for the system,which provides a way to improve the efficiency of disper-sion compensation.关键词
光学/激光调频连续波(frequency modulated continuous wave,FMCW)/激光测距/色散补偿/外腔可调谐激光器Key words
optics/laser frequency modulated continuous wave (FMCW)/laser ranging/dispersioncompensation/external cavity tunable laser分类
信息技术与安全科学引用本文复制引用
许新科,龙康,徐靖翔,赵军,王道档,刘璐,刘维,郭天太,孔明..基于激光调频连续波正反向调谐色散对消方法[J].红外与毫米波学报,2021,40(2):243-247,5.基金项目
Supported by Zhejiang Provincial Natural Science Foundation of China(LY19F050008) （LY19F050008）
