量子密钥分配系统相位调制器驱动电路设计  

Design of Phase Modulator Drive Circuit for Quantum Key Distribution

作　　者：李云根 朱甫臣 

机构地区：[1]现代通信国家重点实验室,四川成都610041

出　　处：《信息安全与通信保密》2010年第8期73-75,共3页Information Security and Communications Privacy

摘　　要：通过分析量子密钥分配系统中相位调制器的工作原理和电路性能要求,设计了相位调制器的驱动电路。该方案基于铌酸锂电光相位调制器而设计,通过现场可编程门阵列(FPGA)提供时钟和控制信号,采用高精度的数模转换器和高速模拟开关,能够产生精度可达纳秒量级的驱动信号。该驱动电路成本低廉,调制精度高,功耗较小,实现了对光信号相位的精确控制。经测试,实验结果完全满足系统要求,验证了该方案的可行性与可靠性。Based on analysis of working principle and circuit requirement of the phase modulator in quantum key distribution system, the phase modulator drive circuit is designed. The scheme, based on LiNbO3 electro-optic phase modulator, applies FPGA to providing the clock and control signals, while high-precision DAC and high-speed analog switch to producing the drive signal with precision up to nanoseconds. The driver circuit, with low cost, high modulation precision, and low power consumption, could achieve a precise control of optical phase. The experimental result indicates that this design could fully meet the system requirements, and the scheme is of feasibility and reliability.

关 键 词：量子密钥分配 相位调制 驱动电路 

分 类 号：TN918[电子电信—通信与信息系统]