量子电子学报, 2023, 40 (5): 677, 网络出版: 2023-11-24  

光电反馈抑制DBR单纵模光纤激光器的弛豫振荡噪声

Relaxation oscillation noise suppression in a DBR single-longitudinal-mode fiber laser using optoelectronic feedback
作者单位
1 中国科学技术大学环境科学与光电技术学院, 安徽 合肥 230026
2 中国科学院合肥物质科学研究院安徽光学精密机械研究所光子器件与材料安徽省重点实验室,安徽 合肥 230031
摘要
报道了使用光电反馈法对 1.5 μm 分布式布拉格反射 (DBR) 单纵模光纤激光器强度噪声的抑制结果。通过分析光纤激光器的泵浦扰动到激光输出功率波动的传递函数, 发现其相频响应在弛豫振荡频率处有180°相位突变。因此,依据已有的商用比例积分 (PI) 控制电路设计并构建了一阶移相网络,在弛豫振荡频率处提供45°超前相位以补偿该频率处的相位突变。采用该反馈控制系统,可将激光器的弛豫振荡峰由 -95 dB/Hz降至 -125 dB/Hz,抑制幅度高达30 dB。抑制后的光纤激光器有望在精密测量等应用中发挥重要作用。
Abstract
The suppression of intensity noise in a 1.5 μm distributed Bragg reflector (DBR) single-longitudinal-mode fiber laser using optoelectronic feedback was reported. By analyzing the transfer function from the pump disturbance to the output power fluctuation, it was found that the phase of the fiber laser has a 180° phase mutation at the relaxation oscillation frequency. Therefore, a first-order phase-shifting network, which can provide a 45° lead phase at the relaxation oscillation frequency to compensate for the phase mutation at that frequency, was designed and constructed based on an existing commercial proportional integral (PI) control circuit. With the designed feedback control system, the relaxation oscillation peak of the laser was reduced from -95 dB/Hz to -125 dB/Hz, the suppression amplitude was as high as 30 dB. The suppressed fiber laser is expected to play an important role in applications such as precision measurement.

刘元煌, 魏珊珊, 陈雨君, 姚波, 毛庆和. 光电反馈抑制DBR单纵模光纤激光器的弛豫振荡噪声[J]. 量子电子学报, 2023, 40(5): 677. Yuanhuang LIU, Shanshan WEI, Yujun CHEN, Bo YAO, Qinghe MAO. Relaxation oscillation noise suppression in a DBR single-longitudinal-mode fiber laser using optoelectronic feedback[J]. Chinese Journal of Quantum Electronics, 2023, 40(5): 677.

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