摘要
文章设计一种基于实时数据采集和识别的光学平衡锁相环,该锁相环使用高速数据采集卡,配合高速数字频率解调处理单元,代替传统锁相环中的滤波器,对相位和频率误差信号进行采集和识别,数据采集卡采集相位和频率误差电压信号,高速数字频率解调处理单元通过控制软件从采集的数据中解调频率,并利用数字PID反馈控制本振激光器。此种信号解调方式降低了系统时域噪声和各次谐波对误差信号的影响。对两个窄线宽光纤激光器的锁定实验表明,环路维持锁定状态超过2 h,激光器频率稳定度达到10^(-11),相比自由运行激光器提高了3个量级,在环路处于稳定锁定状态的396 s内,两激光器拍频频率平均波动小于20 kHz。
This paper designs a balanced optical phase-locked loop based on real-time data acquisition and identification.The optical phase-locked loop(OPLL)uses a high-speed data acquisition card and a high-speed digital frequency demodulation processing unit to replace the loop filter in the traditional OPLL to collect and identify the phase and frequency error signals.The data acquisition card collects the phase and frequency error voltage signals,then the high-speed digital frequency demodulation processing unit demodulates the frequency from the collected data through the control software,and the unit uses the digital PID to feedback control the local oscillator laser.This signal demodulation method reduces the influence of time domain noise and harmonics on the error signal.The locking experiments of two narrow linewidth fiber lasers shows that the loop maintains the locking state for more than two hours,the frequency stability of the laser reaches 10^(-11),reaches three orders of magnitude higher than that of the free running laser,and the average fluctuation of the beat frequency of the two lasers is less than 20 kHz within 396 s when the loop is in the stable locking state.
作者
王恒
张荣
孔梅
WANG Heng;ZHANG Rong;KONG Mei
出处
《科技创新与应用》
2022年第6期14-16,21,共4页
Technology Innovation and Application
基金
吉林省自然科学基金(20180101231JC)。
关键词
光学平衡锁相环
激光器频率稳定度
光学频差识别
optical phase-locked loop(OPLL)
laser frequency stability
optical beat frequency recognition
