大幅面空间光自适应耦合技术的研究  

Research on large-area spatial light adaptive coupling technology

作　　者：李晓龙 闫宝罗 胡金耀 李昌瑾 刘海锋[1,2] 林炜 刘波[1] LI Xiaolong;YAN Baoluo;HU Jinyao;LI Changjin;LIU Haifeng;LIN Wei;LIU Bo(Institute of Modern Optics,Nankai University,Tianjin 300350,China;State Key Laboratory of Integrated Optoelectronics,Institute of Semiconductors,CAS,Beijing 100083,China)

机构地区：[1]南开大学现代光学研究所,天津300350 [2]中国科学院半导体研究所集成光电子学国家重点实验室,北京100083

出　　处：《光通信技术》2019年第10期47-52,共6页Optical Communication Technology

基　　金：国家自然科学基金重大科研仪器研制项目（61727815）资助;南开大学中央高校基本科研业务费专项资金（075-63191745）资助;集成光电子学国家重点实验室开放课题（No.IOSKL2018KF18）资助;2018南开大学自制实验仪器项目（NO.5）资助

摘　　要：在自由空间光通信(FSOC)系统中,空间光-单模光纤耦合效率及稳定度直接影响接收机的性能。为提升耦合效率,基于模场匹配原理,分析了耦合效率与耦合参数之间的关系,设计了空间光-单模光纤大幅面的自适应耦合系统,利用二维压电纳米定位平台、控制模块、驱动模块、光电探测器和耦合透镜构成闭环控制系统,结合光栅扫描算法来实现最佳耦合点的精确定位和稳定跟踪。对于110×110μm2范围内,扫描点设置为8×8时,最佳耦合点的耦合效率为43.4%,较未自动对准时提升了10.6%。在稳定跟踪过程中,耦合效率稳定在43.6%,方差为0.00988。实验结果表明了该方案切实可行,且实用性高。In free-space optical communication(FSOC)systems,coupling efficiency and stability directly affect the performance of the receiver.In order to improve the coupling efficiency,based on the principle of mode field matching,the relationship between coupling efficiency and coupling parameters is analyzed.A large-scale adaptive coupling system of spatial light-single mode fiber is designed.The closed-loop control system is composed of two-dimensional piezoelectric nano-positioning platform,control module,driving module,photodetector and coupling lens.The grating scanning algorithm is combined with the closed-loop control system.Accurate positioning and stable tracking of the optimal coupling point are realized.For the 110×110μm2 area,when the scan point is set to 8×8,the coupling efficiency of the optimal coupling point is 43.4%,which is 10.6%higher than that without automatic alignment.In the stable tracking process,the coupling efficiency is stable at 43.6%and the variance is 0.00988.The experimental results show that the scheme is practical and feasible.

关 键 词：自由空间光通信 单模光纤 耦合 

分 类 号：TN929.12[电子电信—通信与信息系统]