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回顾了相位编码方式实现协议的量子密钥分发实验研究的演进历程和最新进展,选取基于Michel son干涉仪的相位编码、偏振检测单向QKD系统为实验平台,提出一种以单片机和FPGA为核心的相位调制器驱动电路设计方法,并给出了相应实验结果,达到了预期的实验目的. 相似文献
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相位调制器是量子密钥分发系统中不可缺少的调制器件,其输出调制信号的脉宽影响量子比特误码率.本文提出一种利用高速高频模拟开关实现相位调制器驱动电路的设计方法,仿真结果显示驱动电路输出电压脉冲脉宽可低于10ns,并能很好地应用到量子密钥分发实验系统中,从理论及实验上对实验方案的可行性及可靠性进行了验证. 相似文献
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偏振补偿是偏振编码量子密钥分发(QKD)系统的一项关键技术。介绍了利用偏振控制器和双向光路进行偏振补偿的基本原理,简述了偏振编码的QKD系统中常用的光纤信道偏振补偿方案,包括双向光路偏振补偿方案,中断式偏振补偿方案,时分复用(TDM)偏振补偿方案和波分复用(WDM)偏振补偿方案。 相似文献
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一种基于迈克耳逊干涉仪的单向量子密钥分发系统,采用法拉第旋转镜和四端口偏振分束器的组合,消除了光纤及光学器件的双折射效应,具有自稳定特性.信息编码在光子的相位上,通过检测光子的偏振进而解码出信息.以中心波长1310 nm的单光子脉冲,在50 km的干线光纤中获得了30 dB的消光比. 相似文献
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Silica planar lightwave circuit (PLC) devices can offer great potential for quantum key distribution (QKD) with benefits of low-loss, low-cost, large-scale integration, miniaturization, stability and mass production. A complementary encoding-decoding system for QKD based on silica PLC technology was demonstrated, achieving two channels that have balanced outputs simultaneously. This system is consisted of two chips, and each chip is consisted of a variable optical splitter (VOS), an asymmetric Mach-Zehnder interferometer (AMZI) with a thermo-optic phase modulator (TOPM), a delay line (DL), and a directional coupler (DC). The measured delay times of pulse-pairs for two chips are 396 ps and 398 ps, respectively, and the system has shown relatively high interference visibility (IV) of 93.5% and 91.3% for two channels, respectively. 相似文献
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集成光学光纤陀螺芯片 总被引:1,自引:1,他引:0
本文首次报道了国内研制的集成光学光纤陀螺芯片,详细描述了其设计考虑与制作。单 Y 型多功能钛扩散铌酸锂芯片包含消光比大于35dB 的薄膜波导偏振器、分束比为49.5/50.5的3dB 分束器/合束器、半波电压小于5伏的相位调制器,光纤—器件—光纤插入损耗为5.4dB。 相似文献
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用集成光学器件实现相控阵雷达天线的波束形成、控制和归零,有其独特的优点。本文介绍几种用于相控阵雷达的集成光学器件,包括:LiNbO_3集成光学功分器、电光相位调制器、大动态范围调制器和集成光学巴特勒矩阵。 相似文献
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Two designs for polarization independent GaAs-AlGaAs interferometric electrooptic modulators are described. One design uses the linear electrooptic effect to couple degenerate TE/TM eigenmodes of a single-mode waveguide. In the other design the eigenmodes need only be near degenerate. The design using the coupling between near degenerate TE/TM modes utilizes a novel biasing scheme. A novel polarization independent GaAs-AlGaAs interferometric optical modulator based on this design has been fabricated and characterized at 1.3 μm. This modulator is fabricated as a traveling wave modulator incorporating 50 Ω, phase velocity matched, low microwave loss electrodes for maximum electrical bandwidth 相似文献
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本文全面介绍Ti:LiNbO_3波导相位调制器的主要设计参数,详细阐述相位调制器有关性能的测量方法,并扼要说明波导制作和测试结果。试验研究实现了光纤对波导的耦合,并用金属壳体封装。试验测量光纤-波导-光纤插入损耗3.8dB,半波电压7V,调制深度83% 相似文献
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用于光纤陀螺的LiNbO3集成光学器件 总被引:1,自引:0,他引:1
本文报道用于光纤陀螺(FOG)的LiNbO_3集成光学(IO)器件及其技术。介绍制作LiNbO_3波导的扩散和质子交换两种技术,叙述了国内外近年研制和生产的FOG用多功能集成光学芯片及LiNbO_3相位调制器,给出了它们的结构、性能和封装(光纤耦合)技术。对国内外发展状况的综述表明,在这个技术领域,国内研制的器件的性能,已接近国外80年代末的水平。 相似文献
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This paper reports on optical pulse generation using a new guided-wave electrooptic (EO) phase modulator with long resonant electrodes and polarization reversal. Adopting polarization-reversal structure to a guided-wave EO modulator with long standing-wave resonant electrodes, high-efficiency optical modulation is obtained by the compensation of the transit-time effect. By operating a fabricated EO phase modulator with a large amplitude modulation signal, optical sidebands over 100 GHz were obtained. Furthermore, optical pulse trains of an /spl sim/ 25-ps pulsewidth and a 15.28-GHz repetition frequency were successfully obtained by controlling the generated optical sidebands by use of an optical synthesizer. 相似文献