基于双点光学分频的低时间抖动脉冲产生
Generation of Low-Timing-Jitter Optical Pulses Based on Two-Point Optical Frequency Division
苏畅 1戴键1
作者信息
- 1. 北京邮电大学电子工程学院，北京 100876
- 折叠
摘要
低时间抖动光脉冲在精密测量、光电频率合成及低噪声微波产生等领域具有重要应用价值。针对自由运行脉冲激光器重复频率稳定度较低、低频相位波动明显的问题，提出并实验验证了一种基于双点光学分频的低时间抖动脉冲产生方法。该方法采用锁定至同一法布里-珀罗腔不同纵模的两路激光作为光学参考，通过双点光学分频将双频参考的相对稳定性传递至锁模激光器的重复频率，实现对输出脉冲序列的闭环锁定。实验结果表明，与自由运行状态相比，锁定后光电探测得到的1 GHz微波信号在1 Hz处改善36dB，1kHz处改善26dB；在10 Hz至100 kHz积分带宽内，累计均方根时间抖动由252.78 fs降低至8.39 fs。该方法能够有效抑制锁模脉冲序列的低频相位波动，为低时间抖动光脉冲的产生提供了一种有效方案。
Abstract
Low-timing-jitter optical pulses have important applications in precision measurement, optoelectronic frequency synthesis, and low-noise microwave generation. To address the limited repetition-rate stability and pronounced low-frequency phase fluctuations of free-running pulsed lasers, a method for generating low-timing-jitter optical pulses based on two-point optical frequency division is proposed and experimentally demonstrated. In this method, two lasers locked to different longitudinal modes of the same Fabry-Pérot cavity serve as optical references. Through two-point optical frequency division, the relative frequency stability of the two optical references is transferred to the repetition rate of a mode-locked laser, thereby enabling closed-loop stabilization of the output pulse train. Experimental results show that, compared with the free-running state, the phase noise of the photodetected 1 GHz microwave signal is reduced by 36 dB at a 1 Hz offset frequency and by 26 dB at a 1 kHz offset frequency after locking. The integrated root-mean-square timing jitter over the offset-frequency range from 10 Hz to 100 kHz is reduced from 252.78 fs to 8.39 fs. This method effectively suppresses the low-frequency phase fluctuations of the mode-locked pulse train and provides an effective approach for generating low-timing-jitter optical pulses.关键词
光学工程/光学分频/光频梳/相位噪声/时间抖动Key words
optical engineering/optical frequency division/optical frequency comb/phase noise/timing jitter引用本文复制引用
苏畅,戴键.基于双点光学分频的低时间抖动脉冲产生[EB/OL].(2026-10-20)[2026-10-21].http://www.paper.edu.cn/releasepaper/content/202610-13.学科分类
光电子技术
