基于光注入下电流调制1550nm垂直腔面发射激光器获取宽带光学频率梳  

Broadband Optical Frequency Comb Generation Based on a Current-modulated 1 550nm-VCSEL Subject to Optical Injection

作　　者：李桂英 杨文艳 吴正茂[1] 夏光琼[1] LI Gui-ying;YANG Wen-yan;WU Zheng-mao;XIA Guang-qiong(School of Physical Science and Technology,Southwest University,Chongqing 400715,China;School of Mathematics and Physics,Chongqing University of Science and Technology,Chongqing 401331,China)

机构地区：[1]西南大学物理科学与技术学院,重庆400715 [2]重庆科技学院数理学院,重庆401331

出　　处：《光子学报》2019年第12期64-74,共11页Acta Photonica Sinica

基　　金：国家自然科学基金(Nos.61575163,61775184,61875167)~~

摘　　要：数值研究了一种获取宽带光学频率梳的方案.在该方案中,首先采用调制频率f m=f 0/n(f 0为1550 nm垂直腔面发射激光器中两正交偏振分量频率间隔,n为整数)的大调制信号电流调制一个1550 nm垂直腔面发射激光器,使该1550 nm垂直腔面发射激光器中的主振荡模式—Y偏振分量输出光学频率梳,而X偏振分量处于被抑制状态;进一步地,引入线偏振光注入,使激光器中两个偏振分量(光谱主峰比小于15 dB)均实现光学频率梳输出;再借助一个偏振片,将这两个偏振分量引导到该偏振片的透振方向实现光谱拼接,从而获取宽带光学频率梳.基于自旋反转模型,数值研究了由该方案产生的光学频率梳特性.仿真结果表明:在给定的参数条件下,一个自由运行1550 nm垂直腔面发射激光器(阈值电流为2.6 mA)偏置在11.5 mA时,Y偏振分量占主导而X偏振分量被抑制(光谱主峰比大于30 dB);在受到调制深度较大的电流调制作用下,该激光器只在Y偏振分量输出光学频率梳;引入线性偏振光注入后,通过调整线性偏振光的偏振方向,可使X、Y偏振分量同时实现光学频率梳输出;最后,利用一偏振片将X、Y偏振分量引导到该偏振片的透振方向实现光谱拼接,最终可获得一个带宽超过80 GHz的光学频率梳.A scheme for generating broadband optical frequency comb was proposed and numerically simulated.For this scheme,a 1550 nm vertical-cavity surface-emitting laser under a large signal current modulation with a modulation frequency of f m=f 0/n(f 0 is the frequency interval of two orthogonal polarization components of a 1550 nm vertical-cavity surface-emitting laser,n is an integer)can output an optical frequency comb in the dominant Y polarization component direction while the X polarization component is suppressed.By further introducing a linearly polarized optical injection,both the two polarization components(spectral main-peak ratio less than 15 dB)can output optical frequency combs.Finally,via a polarizer the two optical frequency combs with orthogonal polarization components can be decomposed by spectral splicing to obtain a broadband optical frequency comb.Based on the spin-flip model,the optical frequency comb performances of generated by this scheme is numerically investigated.The numerical results demonstrate that,when the bias current of a 1550 nm vertical-cavity surface-emitting laser with a threshold current of 2.6 mA is set at 11.5 mA,the Y polarization component dominates while the X polarization component was suppressed,and the ratio of the main spectral peaks of the two polarization components is more than 30 dB.Under a current modulation with a large modulation index,only the Y polarization component of the laser can realize an optical frequency comb output.By further introducing a linearly polarized optical injection,both two polarization components can output optical frequency combs by adjusting the polarization direction of the linearly polarized light.Finally,a polarizer is used to guide the two polarization components to the transparent direction of the polarizer to achieve the spectral splicing,and then an optical frequency comb with a bandwidth more than 80 GHz can be obtained.

关 键 词：光注入 电流调制 1550 nm垂直腔面发射激光器 光学频率梳 

分 类 号：TN248.4[电子电信—物理电子学]