光纤链路频率传输与同步系统设计  

Design of Optical Fiber Link Frequency Transmission and Synchronization System

作　　者：邹岷杉 曹益平[1] ZOU Min-shan;CAO Yi-ping(School of Electronic Information,Sichuan University,Chengdu 610065,China)

机构地区：[1]四川大学电子信息学院,四川成都610065

出　　处：《光学与光电技术》2024年第1期1-9,共9页Optics & Optoelectronic Technology

基　　金：国家自然基金资助(62375188)资助项目。

摘　　要：在光纤通信领域,载频的不同步将导致数据传输至终端无法解调,为实现载频信号在光纤上的稳定传输,设计了一个自适应相位补偿系统。该系统结合模拟电路和数字信号处理技术,利用信号分频、混频等手段,将信号在往返传输过程中引入的双程相位抖动转变为单程相位抖动,采用单次模拟相移进行预补偿。通过引入PID控制算法,对移相电压进行准确调控,提高了系统补偿的准确性和稳定性。分析了环境温度对链路时延的影响,对比了补偿后与自由传输状态下远端信号的相位漂移。结果表明,在该补偿系统的作用下,链路时延抖动稳定在15 ps内,远端信号的长期稳定度达到6.9×10^(-19)/10^(4)s。对同一温度变化模型进行了不同距离用户端自适应相位补偿系统的性能对比分析,结果表明本方案在预热30 s内均可达到稳态,并实现有效补偿。该系统对长距离光纤频率传递技术有着支撑作用。In the field of optical fiber communication,the asynchronism of carrier frequency will cause the data transmission to the terminal cannot be demodulated.To achieve the stable transmission of carrier frequency signal on optical fiber,an adaptive phase compensation system is designed in this paper.The system combines analog circuit and digital signal processing technology,uses signal frequency division,mixing and other means to change the two-way phase jitter introduced in the process of signal round-trip transmission into single-way phase jitter,and uses a single analog phase shift for pre-compensation.By introducing PID control algorithm,the phase shift voltage is regulated accurately,and the accuracy and stability of the system compensation are improved.The influence of ambient temperature on the link delay is analyzed,and the phase drift of the remote signal after compensation is compared with that in the free transmission state.The results show that the link delay jitter is stable within 15 ps,and the long-term stability of the remote signal reaches 6.9×10^(-19)/10^(4) s.The performance of the adaptive phase compensation system at different distances is compared with the same temperature change model.The results show that the scheme can reach steady state within 30 s of warming up and realize effective compensation.The system supports the technology of long distance optical fiber frequency transmission.

关 键 词：光纤传输 频率同步 模拟相移 相位补偿 自适应性 

分 类 号：TN253[电子电信—物理电子学]