全光纤量子通信系统中的高速偏振控制方案  

High-speed polarization controller for all-fiber quantum communication systems

作　　者：李申[1] 马海强[2,3] 吴令安[2] 翟光杰[1] 

机构地区：[1]中国科学院空间科学与应用研究中心空间科学实验技术研究室,北京100190 [2]中国科学院物理研究所,北京凝聚态物理国家实验室,光物理重点实验室,北京100190 [3]北京邮电大学理学院,北京100876

出　　处：《物理学报》2013年第8期231-235,共5页Acta Physica Sinica

基　　金：国家重点基础研究发展计划(批准号:2010CB922904);国家自然科学基金(批准号:60978002;61178010);国家高技术研究发展计划(批准号:2011AA120102)资助的课题~~

摘　　要：偏振控制在光通信中是至关重要的技术,关系着通信系统的稳定性和误码率.本文提出一种基于双向Sagnac环工作方式的全光纤高速偏振控制方案,通过调节环中一个光纤电光相位调制器的相位差而精确控制光场偏振方向,并且实现了单个端口输出各种偏振态,无需后续耦合操作.相位控制精度为10-3rad,最大消光比可达30dB,工作速率可达2GHz.由于本方案的精度、调制速度和稳定性都很高,并采用了器件简单、成本低廉的全光纤光路,易于集成,在量子保密通信等光通信领域中有很好的应用前景.Polarization control is of vital importance in optical communications, which can affect the stability and bit error rate of a system. We demonstrate an all-fiber high-speed polarization control scheme based on a bidirectional Sagnac ring. The polarization direction can be accurately controlled by adjusting the phase difference of an electro-optic fiber phase modulator in the ring, meanwhile it is realized that only a single beam port outputs different polarization states. The phase can be adjusted accuratly to 10-3 rad, giving an extinction ratio as high as 30 dB, and the modulation speed can reach 2 GHz. The system has excellent stability, and as the optical circuit consists of simple, low cost components which can be easily integrated, there are good prospects for its application in quantum cryptography and other optical communcations fields.

关 键 词：光纤偏振控制器 SAGNAC环 量子通信 

分 类 号：TN929.11[电子电信—通信与信息系统]