基于光纤耦合器的全光纤链路锁相控制

发布时间：2018-08-09 10:07

【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]:An all-fiber link phase-locking method based on fiber coupler is proposed. In order to obtain the performance index, the optical fiber cross connection makes the interference between the outgoing beam and the local oscillator laser and the backward return light of the fiber end surface in the fiber coupler. A random parallel gradient descent algorithm (SPGD) is used to optimize the performance of the optical fiber to realize the phase locking of the multi-channel outgoing beam at the end of the fiber. Firstly, the model of this method is established, and the steady state condition of its phase locking control is discussed. Two experiments of phase-locking in all optical fiber link are built, and the collimation of two outgoing fiber laser is carried out, and the precision of phase locking is determined by the far field interference fringe image obtained by the camera. The experimental results show that under the condition of sinusoidal phase disturbance amplitude of 4 wavelengths and frequency of 2 Hz, The phase-locked method can increase the contrast of long exposure image fringes from 0.25 in open loop to 0.82 in closed loop, and increase the contrast of single frame short exposure image from 0.65 in open loop to 0.98 in closed loop.
【作者单位】：中国科学院自适应光学重点实验室;电子科技大学光电信息学院;中国科学院光电技术研究所;中国科学院大学;
【基金】：中国科学院实验室创新基金(CXJJ-15S096) 国家自然科学基金资助项目(61675205)
【分类号】：TN253

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