基于平面光波导注入锁定技术的分布式反馈激光器阵列相干合束光源  

Coherent Beam Combining Laser Source Based on an Injection⁃Locked DFB Laser Array Using Planar Lightwave Circuit Technology

作　　者：章郑豪 魏芳[1,3] 武慧敏 苏庆帅 陈晨 叶青[1] 蔡海文[1,3] Zhang Zhenghao;Wei Fang;Wu Huimin;Su Qingshuai;Chen Chen;Ye Qing;Cai Haiwen(Key Laboratory of Space Laser Communication and Detection Technology,Shanghai Institute of Optics and Fine Mechanics,Chinese Academy of Sciences,Shanghai 201800,China;University of Chinese Academy of Sciences,Beijing 100049,China;Zhangjiang Laboratory,Shanghai 201210,China)

机构地区：[1]中国科学院上海光学精密机械研究所空间激光信息传输与探测技术重点实验室,上海201800 [2]中国科学院大学,北京100049 [3]张江实验室,上海201210

出　　处：《中国激光》2023年第19期53-60,共8页Chinese Journal of Lasers

基　　金：国家自然科学基金(62275253);上海市自然科学基金(21ZR1472100);中国科学院战略性先导科技专项(B类)(XDB43030400)。

摘　　要：面向芯片化空间激光通信、激光雷达等应用对高功率激光光源的需求,笔者将注入锁定到同一种子光的分布式反馈激光器(DFB激光器)阵列通过平面波导耦合器进行相干合束,解决了单个DFB激光器功率受限的问题。为了研究基于注入锁定技术的DFB激光器阵列的相干合束效果,测量了不同数目的注入锁定激光器在相干合束前后的光功率、相位噪声、相对强度噪声,通过计算得到2、3、4个DFB激光器的合束效率分别为91.6%、87.8%、78.3%,实现了相对于单个激光器的光功率放大,同时通过理论分析和实验研究了相干合束对相位噪声及相对强度噪声的影响。Objective A silicon-based optoelectronic chip provides a good solution for integrated space laser communication and LiDAR applications owing to its small size,low power consumption,low cost,high integration,high modulation bandwidth,and CMOS preparation process compatibility.During hybrid integration ofⅢ-Ⅴlasers with silicon-based optoelectronic chips,the coupling loss between the light source and the silicon-based optoelectronic chip is large.Therefore,the power requirement of the laser light source is higher than that of discrete devices,and the output power of the laser which was realized with single-chip integration or hybrid integration to achieve high side mode suppression ratio and narrow linewidth is generally a few tens of milliwatts.Erbium-doped fiber amplifiers are typically required to amplify the optical power of on-chip light sources,but this in turn limits the integration of optoelectronic chips;therefore,high-power on-chip light sources are a pressing problem for current on-chip laser applications.Coherent beam combining can be used to break the output power limit of a single laser.Coherent beam combining typically consists of two methods:one using a master oscillator and power amplifier(MOPA),and the other using an injection-locking technique.However,the spontaneous radiation of the optical amplifier increases the beam noise and makes the laser application system less effective;therefore,the coherent beam combining technique using injection-locking technology is more suitable for coherent detection systems that are more sensitive to laser noise.In 2001,Musha et al.used two injection-locked Nd∶YAG lasers to achieve coherent beam combining of spatial light with a beam combining efficiency of 94%;however,the scheme used discrete devices,and the arm length difference between the coupler arms had to be compensated in real time by an electronic feedback loop.In this study,to overcome the large coupling loss in hybrid integration and meet the requirements of laser light source power for space lase

关 键 词：激光器 注入锁定 相干合束 相位噪声 相对强度噪声 

分 类 号：O436[机械工程—光学工程]