光纤四通道双平衡外差相位检测实验研究  

Fiber-Optic Four-Channel Dual-Balanced Heterodyne Phase Detection

作　　者：施剑波 张娟[1] 刘德安[2,3] Shi Jianbo;Zhang Juan;Liu Dean(Key Laboratory o f Specialty Fiber Optics and Optical Access Networks , School of Com municat ion & Information Engineering , Shanghai University , Shanghai 200444, China;National Laboratory of High Power Laser Physics , Shanghai Institute of Optics and Fine Mechanics ,Chinese Academy of Sciences , Shanghai 201800, China;Center of Materials Science and Optoelectronics Engineering , University of Chinese Academy of Sciences ,Beijing 100049, China)

机构地区：[1]上海大学通信与信息工程学院特种光纤与光接入网省部级共建国家重点实验室培育基地,上海200444 [2]中国科学院上海光学精密机械研究所高功率激光物理联合实验室,上海201800 [3]中国科学院大学材料与光电研究中心,北京100049

出　　处：《中国激光》2019年第9期175-180,共6页Chinese Journal of Lasers

基　　金：国家自然科学基金(11774364);上海市青年科技英才扬帆计划(18YF1425900)

摘　　要：为实现高灵敏度的外差相位检测,提出了一种基于光外差检测原理的光纤四通道双平衡外差相位检测方法。搭建光纤四通道双平衡外差检测光路,采用1/4波片作为相位检测样品,验证分析了光纤四通道双平衡外差相位检测的性能。分析了外差检测中信号调制频率对相位测量结果的影响,结果表明受限于光电接收器件的响应带宽,过高或过低的调制频率均不能有效检测到相位信息。在实验中,最优的信号调制频率范围为500.5~1550.5 kHz,实际测得的相位均方根为89.1°,标准差为0.3°。在此基础上,分析了双平衡外差干涉中光纤分束比以及耦合透镜的有效接收口径效应对相位检测的影响。当光纤分束比接近1∶1时,得到了较高信噪比下更加精确的检测结果;通过改变耦合透镜的发射角,验证了有效接收口径对接收信号灵敏度的实际影响。This study proposes a fiber-optic four-channel dual-balanced heterodyne phase detection method based on optical heterodyne detection principle to realize high-sensitivity heterodyne phase detection. A fiber-optic fourchannel dual-balanced heterodyne detection optical path is experimentally established, and a quarter-wave plate is used as a phase detection sample to verify the detection performance. Further, the influence of the signal modulation frequency on the phase measurement result in heterodyne detection is analyzed. Results reveal that the phase information cannot be effectively detected by too high or too low modulation frequency due to the limitation of the response bandwidth of the photodetector. Fiber splitting ratio in double-balanced heterodyne interference and the effect of the effective receiving aperture of the coupling lens on phase detection are analyzed based on the optimal signal modulation frequency of 500.5-1550.5 kHz and the actual measured phase root-mean-square of 89. 1° with a standard deviation of 0.3°. When the fiber splitting ratio is approximately 1! 1, a more accurate detection result with a higher signal-to-noise ratio is obtained. The actual influence of the effective receiving aperture on the sensitivity of the received signal is verified by varying the emission angle of the coupling lens.

关 键 词：测量 外差检测 四通道双平衡探测 电光调制 相位检测 

分 类 号：O436[机械工程—光学工程]