基于FPGA的Kerr光孤子频率梳主动控制系统实现
收稿日期: 2025-05-19
网络出版日期: 2025-07-01
Implementation of an Active Control System for Kerr Optical Soliton Frequency Comb Based on FPGA
Received date: 2025-05-19
Online published: 2025-07-01
Kerr光孤子频率梳因具备毫米级尺寸、低阈值泵浦光功率等特点，是目前芯片级光频原子钟研究的热点技术之一．Kerr光孤子形成过程中腔内功率骤降，热效应引起的腔频漂移会显著缩短Kerr光孤子频率梳的寿命．目前已有孤子功率控制、Pound-Drever-Hall（PDH）锁频技术以及辅助激光模式等多种主动控制方法来长时稳定Kerr光孤子的研究报道，但是应用于这些方案的电子学控制系统研究则鲜有报道．本文开发一种基于现场可编程逻辑门阵列（Field-Programmable Gate Array, FPGA）的Kerr光孤子频率梳的主动控制系统，并通过孤子功率控制和PDH频率控制两种主动控制方法，分别在MgF2和CaF2微腔中实现了Kerr光孤子频率梳长时间稳定．该控制系统也可以用于其他微腔光梳平台（如Si3N4、AlN、SiO2）的Kerr光孤子频率梳产生与稳定．
关键词： Kerr光孤子频率梳; 主动控制; 现场可编程逻辑门阵列
刘康琦 , 李晨虹 , 曲明飞 , 王鹏飞 , 赵峰 , 康松柏 . 基于FPGA的Kerr光孤子频率梳主动控制系统实现[J]. 波谱学杂志, 2026 , 43(1) : 104 -113 . DOI: 10.11938/cjmr20253167
Due to their millimeter-scale size and low pump power threshold, Kerr optical soliton frequency combs have emerged as a key technology for chip-scale optical atomic clock research. However, the abrupt intracavity power drop during Kerr optical soliton formation leads to cavity frequency drift, which significantly shortens the lifetime of Kerr optical soliton frequency combs. Some active control methods have been reported for long-term stabilization of Kerr solitons, such as soliton power control, Pound-Drever-Hall frequency locking, and auxiliary laser mode. However, the electronic control systems used for these methods are rarely reported. This work presents an active control system for stabilizing Kerr optical soliton frequency combs based on Field-Programmable Gate Array (FPGA). It achieves long-term stable operation of Kerr optical soliton combs in both MgF₂ and CaF₂ microresonators by power control and PDH frequency locking. Furthermore, the system can be extended to other microresonator platforms (e.g., Si₃N₄, AlN, SiO₂) for Kerr optical soliton frequency generation and stabilization.
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