激光与光电子学进展, 2013, 50 (5): 052303, 网络出版: 2013-04-16   

三波片型LiNbO3偏振态产生器的控制方案设计

A Control Scheme of Polarization Generator Based on Three LiNbO3 Wave Plates
作者单位
福州大学物理与信息工程学院, 福建 福州 350108
摘要
基于LiNbO3晶体的一次电光效应,设计构造了三波片结构的延迟量控制型偏振控制器。提出将该偏振控制器作为偏振态发生器,用于连续变量量子保密通信,实现偏振态的快速转换。并提出在通信系统中,用单束信号光作为载波,以两个正交的Stokes分量作为可观测和编码控制的物理量的通信方案,分析了该方案的实现原理。构造了改进的模拟退火算法来完成偏振态快速转换的最优路径搜索,搜索步长设定为电压值小于2.5V的随机值,不仅能保证外加控制电压的渐变性和实际硬件电路的实现,还能消除器件构造瑕疵的影响。通过控制过程仿真,验证了该方案的可行性。提出用数字信号处理器(DSP)控制偏振态转换过程,进而实现高速信息编码的电路设计方案。
Abstract
Based on Pockels effect of LiNbO3 crystal, a retardation-control-type polarization controller (PC) of three wave plates is designed. Creatively using the polarization controller as polarization generator for continuous variable quantum key distribution (CVQKD), the rapid conversion of polarized states is achieved. The proposed communication system uses a single-channel optical signal as a carrier, and the two orthogonal Stokes components as a physical quantity can be observed and encoding controlled. The implementation principle of the proposal is analyzed and verified. An improved simulated annealing algorithm (SAA) is constructed to complete the search of the optimal path for the rapid conversion of polarizated states. The voltage value of the search step is set below 2.5 V, which not only guarantees the applied control voltage gradient and benefits the actual hardware circuit design, but also eliminates the influence of the device structure defects. Control process simulation is carried out to verify the feasibility of the scheme implementation. The actual circuit is suggested to be designed using a digital signal processor (DSP) to complete the entire control process, and further a high-speed information encoding.

黄春晖, 荣维波. 三波片型LiNbO3偏振态产生器的控制方案设计[J]. 激光与光电子学进展, 2013, 50(5): 052303. Huang Chunhui, Rong Weibo. A Control Scheme of Polarization Generator Based on Three LiNbO3 Wave Plates[J]. Laser & Optoelectronics Progress, 2013, 50(5): 052303.

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