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：刘元煌 魏珊珊 陈雨君 姚波 毛庆和 LIU Yuanhuang;WEI Shanshan;CHEN Yujun;YAO Bo;MAO Qinghe(School of Environmental Science and Optoelectronic Technology,University of Science and Technology of China,Hefei 230026,China;Anhui Provincial Key Laboratory of Photonics Devices and Materials,Anhui Institute of Optics and Fine Mechanics,HFIPS,Chinese Academy of Sciences,Hefei 230031,China)

机构地区：[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

出　　处：《量子电子学报》2023年第5期677-683,共7页Chinese Journal of Quantum Electronics

基　　金：国家重点研发计划(2017YFB0405100,2017YFB0405200);中国科学院战略性先导科技专项(B类)(XDB21010300);国家自然科学基金(61805258,61377044);先进激光技术安徽省实验室主任基金(20191001);安徽省科技重大专项(201903a07020021)。

摘　　要：报道了使用光电反馈法对1.5μm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。The suppression of intensity noise in a 1.5μm 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.

关 键 词：激光技术 弛豫振荡噪声 光电反馈 单纵模 光纤激光器 

分 类 号：TN242[电子电信—物理电子学]