摘要
单模光纤自适应耦合装置能够将空间激光高效、稳定的耦合至单模光纤中,在自由空间光通信领域具有重要的研究意义.然而,在长距离、强大气湍流环境下的空间光通信系统中,装置闭环性能会受到光电探测噪声的严重干扰.本文针对该问题开展了深入研究,分析了光电探测噪声的作用机理,建立了噪声干扰程度评价指标,同时结合实际的单模光纤自适应耦合装置开展了相应的数值仿真研究.仿真结果表明,光电探测噪声会对光纤耦合过程中的闭环平均耦合效率、闭环精度、以及闭环带宽产生严重影响.根据仿真结果,本文给出了相应的经验公式,能够用以计算强噪声干扰环境下光纤耦合过程应满足的光学及电学参数.本文的理论及仿真结果能够为长距离、强大气湍流环境下的单模光纤自适应耦合装置的设计提供相应的理论依据.
The single-mode fiber(SMF)adaptive coupling device can efficiently and stably couple the space laser into SMF,which plays an important role in the fiber-based free space optical communication(FSOC)technology.Therefore,a novel corrector named adaptive fiber coupler(AFC)is developed and successfully used in the adaptive SMF coupling applications.However,in the FSOC system under long-range turbulent atmosphere,the closed loop performance of AFC will be seriously disturbed by the photoelectric conversion noise.This problem is studied in depth in this paper.The operational principle of the photoelectric conversion noise is analyzed,and the corresponding evaluation index isgiven.Furthermore,The numerical simulation experiments are conducted to study the specific influence of the photoelectric conversion noise.The results show that the averaged closed-loop coupling efficiency,control accuracy,and control bandwidth of AFC are seriously affected.According to the results,the empirical formula is given.This formula can be used to calculate the optical and electrical parameters that the AFC device should meet under the condition of strong noise interference.The theoretical and simulation results in this paper can provide a theoretical basis for designing the AFC device under long-range turbulent atmosphere.
作者
黄冠
耿超
李枫
李新阳
吕国云
樊养余
Huang Guan;Geng Chao;Li Feng;Li Xin-Yang;Lv Guo-Yun;Fan Yang-Yu(School of Electronics and Information,Northwestern Polytechnical University,Xi’an 710129,China;The key Laboratory on Adaptive Optics,Chinese Academy of Sciences,Chengdu 610209,China;Institute of Optics and Electronics,Chinese Academy of Sciences,Chengdu 610209,China)
出处
《物理学报》
SCIE
EI
CAS
CSCD
北大核心
2021年第22期147-154,共8页
Acta Physica Sinica
基金
国家自然科学基金(批准号:62005286)资助的课题.
关键词
自由空间光通信
单模光纤自适应耦合装置
随机并行梯度下降算法
光电探测噪声
free space optical communication
adaptive SMF coupling device
stochastic parallel gradient descent algorithm
photoelectric conversion noise
