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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。
Based on the primary electro-optic effect of LiNbO3 crystal, a retardation-controlled polarization controller with three-wave plate structure is designed. It is proposed that the polarization controller be used as a polarization state generator for continuous variable quantum secure communication to achieve fast conversion of polarization state. In the communication system, a single beam of signal light is used as a carrier, and two orthogonal Stokes components are used as a communication scheme of observable and coding control physical quantities. The realization principle of the scheme is analyzed. An improved simulated annealing algorithm is constructed to search the optimal path for the rapid change of polarization state. The search step is set to a random value whose voltage value is less than 2.5V. This not only ensures the gradual change of the applied control voltage and the realization of the actual hardware circuit, It also eliminates the effects of device construction artifacts. By controlling the process simulation, the feasibility of the scheme is verified. Proposed digital signal processor (DSP) to control the polarization state conversion process, and then realize high-speed information coding circuit design.