中国激光, 2009, 36 (11): 2972, 网络出版: 2009-11-11
基于随机并行梯度下降算法光纤放大器相干合成的动态模拟与控制带宽分析
Dynamical Simulation and Control Bandwidth Analysis on Coherent Beam Combining of Fiber Amplifiers Based on Stochastic Parallel Gradient Descent Algorithm
光纤光学 光纤放大器 相干合成 随机并行梯度下降算法 动态模拟 控制带宽 fiber optics fiber amplifier coherent beam combining stochastic parallel gradient descent algorithm dynamic simulation control bandwidth
摘要
对随机并行梯度下降(SPGD)算法校正时变相位噪声的动态过程进行数值模拟,计算不同强度和频率的相位噪声对控制带宽的影响程度,分析控制带宽与光束数目以及算法执行速度之间的关系。计算结果表明,随着相位噪声强度和频率的增加,算法的控制带宽随之减小,带宽大小与参与合成的光束数目N的-4/3次方成正比,与算法执行速度成线性关系。计算结果可为SPGD算法应用至多路高功率光纤放大器相干合成提供参考。
Abstract
Dynamical simulation on coherent beam combining of multiple fiber amplifiers based on stochastic parallel gradient descent (SPGD) algorithm is carried out. The influence of phase noise with different amplitude and frequency on the control bandwidth is computed,and the relationship between control bandwidth and laser numbers and iteration rates of the algorithm is analyzed. The results show that the control bandwidth decrease as an increase in the amplitude or frequency of the phase noise,the value is in proportional to N-4/3 and iteration rate,where N is the laser numbers. The computing results present a reference for scaling coherent beam combining based on SPGD algorithm to high-power,large-number of laser beams.
周朴, 马阎星, 王小林, 马浩统, 许晓军, 刘泽金. 基于随机并行梯度下降算法光纤放大器相干合成的动态模拟与控制带宽分析[J]. 中国激光, 2009, 36(11): 2972. Zhou Pu, Ma Yanxing, Wang Xiaolin, Ma Haotong, Xu Xiaojun, Liu Zejin. Dynamical Simulation and Control Bandwidth Analysis on Coherent Beam Combining of Fiber Amplifiers Based on Stochastic Parallel Gradient Descent Algorithm[J]. Chinese Journal of Lasers, 2009, 36(11): 2972.
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