光电振荡器测距方法中的纵模阶数测量

在光电振荡器(OEO)测距方法中，振荡频率与环路群时延关系的建立依赖于纵模阶数，纵模阶数测量误差直接影响测距精度。但是OEO频率稳定性较低，通过直接测量振荡频率和相邻纵模频率间隔所获得的纵模阶数误差较大。分析了频率漂移对纵模阶数测量的影响及测量过程中的频率漂移规律，提出一种新的纵模阶数测量方法，该方法在不改变OEO结构的基础上，利用OEO纵模等间隔分布的特点，分别测量振荡模到x阶高阶模和x阶低阶模的频率间隔后获取纵模间距，减小并补偿频率漂移造成的误差。随后建立了纵模阶数测量误差模型，并进行了1 km光纤20 GHz信号的纵模阶数测量对比实验，实验结果与误差模型相符。

Abstract

The mode number of optoelectronic oscillators is the key parameter to establish the relationship between the oscillation frequency and loop group delay in the distance measurement method based on optoelectronic oscillators (OEO), and the mode number error can affect the accuracy directly. Due to the low frequency stability of OEO, the accuracy of mode number by measuring the oscillation frequency and inter-mode frequency spacing is not high. The influence of frequency stability on the mode number error and the change law of frequency drifts are analyzed. Then a new method to determine the mode number without changing the structure of OEO is proposed. In this method, the frequency spacing between oscillation mode and x-order-higher mode and the frequency spacing between oscillation mode and x-order-lower mode are measured separately to get the inter-mode frequency spacing, in order to compensate and reduce error induced by frequency drifts. The mode number measurement error model of this method is established. Experiments are conducted by using different methods, and the experimental results are consistent with error analysis.

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邾继贵, 郭庭航, 林嘉睿, 张涛, 崔鹏飞. 光电振荡器测距方法中的纵模阶数测量[J]. 中国激光, 2014, 41(3): 0308004. Zhu Jigui, Guo Tinghang, Lin Jiarui, Zhang Tao, Cui Pengfei. Mode Number Determination of Distance Measurement Method Based on Optoelectronic Oscillators[J]. Chinese Journal of Lasers, 2014, 41(3): 0308004.

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