Implementation of an Active Control System for Kerr Optical Soliton Frequency Comb Based on FPGA

doi:10.11938/cjmr20253167

Abstract

Abstract:

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.

Key words: Kerr optical soliton frequency comb, active control, field-programmable gate array (FPGA)

CLC Number:

O482.53

LIU Kangqi, LI Chenhong, QU Mingfei, WANG Pengfei, ZHAO Feng, KANG Songbai. Implementation of an Active Control System for Kerr Optical Soliton Frequency Comb Based on FPGA[J]. Chinese Journal of Magnetic Resonance, 2026, 43(1): 104-113.

Figures/Tables 7

Table 1

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微腔材料	产生Kerr光孤子频率梳的方法
MgF₂	快速扫频、Power-Kicking
SiO₂	相位调制脉冲泵、Power-Kicking
Si₃N₄	扫频、热调谐、相位调制脉冲泵、Power-Kicking、输入锁定、压点调谐
LiNbO₃	光折变
SiON	热调谐、辅助光
AlN	快速扫频、辅助模式
AlGaS	快速扫频