超宽带线性调频信号的光纤高速传输系统设计  

Design of optical fiber high speed transmission system for ultra wideband LFM signal

作　　者：冀松 冯娟 王艳 JI Song;FENG Juan;WANG Yan(Baoding university of technology,Baoding 0710001 China)

机构地区：[1]保定理工学院,河北保定071000

出　　处：《激光杂志》2022年第4期120-124,共5页Laser Journal

基　　金：全国高等院校计算机基础教育教学研究项目(No.2020-AFCEC-159)。

摘　　要：为解决超宽带线性调频信号长距离传输困难,难以保证信号光纤传输时效性等问题,提出设计一种模拟信号与数字信号混合传输的超宽带线性调频信号光纤高速传输系统。系统硬件设计中设计模拟传输与数字传输子系统,实现中心站和每个接收子站间控制信号、同步定时信号和检测信号传输;在此基础上,依照载波信道具备的衰落差别性,在窃听信道模型基础上,计算窃听端和授权接收端平均信噪比不同安全传输速率;使用库恩塔克条件优化分配载波功率,增强系统安全传输能力;采用预失真补偿方法检测激光器调制特征曲线,使用和激光器拥有逆向失真特征的网络完成补偿,实现信号光纤高速传输。实验结果表明,采用所提系统可实现超宽带线性调频信号高速率传输,传输速度最短约为0.50 s,且传输数据的精度始终高于90%,具有一定优势。In order to solve the problems of long-distance transmission of ultra wideband LFM signal and the timeliness of optical fiber transmission, a high-speed optical fiber transmission system of ultra wideband LFM signal is proposed in this paper. In the hardware design of the system, analog transmission and digital transmission subsystem are designed to realize the transmission of control signal, synchronous timing signal and detection signal between central station and each receiving sub station. On this basis, according to the fading difference of carrier channel, based on the eavesdropping channel model, the average signal-to-noise ratio of eavesdropping end and authorized receiving end and different security transmission rates are calculated. The Kuenta condition is used for optimizing carrier power to enhance the system’s safe transmission ability. The modulation characteristic curve of the laser is detected by predistortion compensation method, and the network with reverse distortion characteristics of the laser is used to complete the compensation, so as to realize high-speed transmission of the signal through optical fiber. The experimental results show that the proposed system can achieve high-speed transmission of UWB LFM signal, the shortest transmission speed is about 0.50 s, and the accuracy of data transmission is always higher than 90%.

关 键 词：超宽带 线性调频信号 光纤传输 库恩塔克条件 预失真补偿 

分 类 号：TN924[电子电信—通信与信息系统]