数/模转换器对QNRC系统性能的影响及解决方案

Influence of digital-to-analog converter on the performance of QNRC system and its solution

高采样速率、高分辨率数/模转换器(DAC)是量子噪声随机加密(QNRC)系统性能提升的核心器件之一,一直制约着QNRC系统技术发展。为了探究不同的DAC采样速率和分辨率对QNRC系统性能的影响,采用VPItransmission Maker Optical System 9.1软件进行系统仿真设计.首先,搭建了介观态功率为-21 d Bm、传输距离为1000 km、传输速率为10 Gb/s和密文态数目为28-1的基于相移键控的QNRC系统;然后,改变DAC的采样速率、分辨率,对QNRC系统的性能进行对比分析。分析结果表明:当DAC的采样速率、分辨率分别为30 Gb/s、6 bit时,QNRC系统的性价比最佳。

The high sampling rate and high resolution digital-to-analog converter(DAC) is one of the core components to improve the performance of quantum noise random encryption(QNRC) system,which has been restricting the development of QNRC system technology.In order to explore the effects of different DAC sampling rates and resolutions on the performance of the QNRC system,the VPItransmission Maker Optical System 9.1 software is used for system simulation design.Firstly,a QNRC ststem basded on phase-shift keying modulation with mesoscopic power of-21 dBm,transmission distance of 1000 km,transmission rate of10 Gb/s and number of ciphertext states of 28-1 is built.Then,the sampling rate and resolution of DAC are changed to compare and analyze the performance of QNRC system.The analysis results show that when the DAC sampling rate and resolution are30 Gb/s and 6 bit respectively,the QNRC system has the best cost-performance ratio.