基于激光调频连续波正反向调谐色散对消方法
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中国计量大学 计量测试工程学院,浙江 杭州 310018

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TN249

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The method of dispersion cancellation based on the forward and reverse tuning of a laser frequency-modulated continuous wave system
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College of Metrology and Measurement Engineering, China Jiliang University, Hangzhou 310018, China

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Supported by Zhejiang Provincial Natural Science Foundation of China (LY19F050008)

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    摘要:

    为了减小宽带激光调频连续波测量中的色散失配效应,提出了一种外腔可调谐激光器正、反向调谐消除色散失配的方法。当外腔可调谐激光器与光纤光路结合时,系统将产生色散失配效应,表现为目标信号的谱峰展宽和峰值偏移,测距值随调谐带宽增加而变化,导致测量不稳定。为了解决这一问题,研究了外腔可调谐激光器正、反向调谐时的系统色散失配特性,结果表明,在正反向扫频时色散趋势具有对称分布的特点,建立了正反向扫频系统色散失配模型,在此基础上提出通过外腔激光器正、反向调谐实现色散对消。该方法不需要预先标定系统的色散系数,也不需要循环迭代补偿,单次测量即可完成系统色散补偿,从而为提高色散补偿效率提供了一种思路。

    Abstract:

    To reduce the dispersion mismatch effect on FMCW measurements, a method of eliminating dispersion mismatch by the forward and reverse tuning of an external cavity tunable laser is proposed. When the external cavity 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 establishes 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 dispersion compensation.

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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]. XU Xin-Ke, LONG Kang, XU Jing-Xiang, ZHAO Jun, WANG Dao-Dang, LIU Lu, LIU Wei, GUO Tian-Tai, KONG Ming. The method of dispersion cancellation based on the forward and reverse tuning of a laser frequency-modulated continuous wave system[J]. J. Infrared Millim. Waves,2021,40(2):243~247.]

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  • 收稿日期:2020-06-09
  • 最后修改日期:2021-04-02
  • 录用日期:2020-10-27
  • 在线发布日期: 2021-03-30
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