光电工程, 2017, 44 (6): 602, 网络出版: 2017-11-27   

基于光纤耦合器的全光纤链路锁相控制

Phase-locking control in all fiber link based on fiber coupler
李枫 1,2,3,4耿超 1,3李新阳 1,3,*邱琪 2
作者单位
1 中国科学院自适应光学重点实验室,成都 610209
2 电子科技大学光电信息学院,成都 610054
3 中国科学院光电技术研究所,成都 610209
4 中国科学院大学,北京 100049
摘要
提出了一种基于光纤耦合器的全光纤链路锁相方法。通过光纤交叉互联使得出射光束与本振激光之间以及光纤端面后向回光相互间在光纤耦合器内进行干涉以获得性能指标,利用随机并行梯度下降算法(SPGD)对性能指标进行盲优化控制,实现多路出射光束在光纤端面处的相位锁定。首先建立了这种锁相方法的模型,讨论其锁相控制的稳态条件。搭建了两路全光纤链路锁相实验,并对两路出射光纤激光进行准直发射,通过相机获得的远场干涉条纹图像来判定锁相精度。实验结果表明,在引入正弦相位扰动幅值4个波长和频率2 Hz的情况下,该锁相方法能够将10 s长曝光图像条纹对比度从开环时的0.25提升至闭环时的0.82,单帧短曝光图像条纹对比度从开环时的0.65提升至闭环时的0.98。
Abstract
A new technique of phase-locking control in all fiber link based on fiber coupler has been proposed. Laser beams backscattered by the fiber tips of the different outgoing fiber laser beams interfere with each other in the fiber couplers. Meanwhile, the outgoing laser beams interfere with the partial local laser beams in the fiber couplers. These interference results provide metrics for phase-locking control algorithm named stochastic paral-lel gradient descent (SPGD). Laser beams are then phase-locked on their outgoing fiber tips under such system. Model of such novel phase-locking system for multi-laser-beams is built and steady-state control conditions are discussed. All fiber phase-locking is achieved for two laser beams in our experiment. The two laser beams are collimated and adjusted to overlap and interfere with each other in far field. Interference patterns in far field are collected by high speed camera to judge the control performance. Experimental results show that such technique promotes the fringe visibility of the long-exposure pattern during 10 s from 0.25 in open loop to 0.82 in closed loop, under phase disturb with an amplitude of 4 wavelengths and a frequency of 2 Hz. Fringe visibility of the short exposure pattern rises from 0.65 to 0.98 correspondingly. Key

李枫, 耿超, 李新阳, 邱琪. 基于光纤耦合器的全光纤链路锁相控制[J]. 光电工程, 2017, 44(6): 602. Feng Li, Chao Geng, Xinyang Li, Qi Qiu. Phase-locking control in all fiber link based on fiber coupler[J]. Opto-Electronic Engineering, 2017, 44(6): 602.

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