基于调制光注入半导体激光器产生宽带可调谐微波频率梳  

Broadband Tunable Microwave Frequency Comb Generation Based on Modulated Optical Injection Semiconductor Laser

作　　者：刘娜 樊利[3] 夏光琼[1,2] 吴正茂[1,2] LIU Na;FAN Li;XIA Guangqiong;WU Zhengmao(School of Physical Science and Technology,Southwest University,Chongqing 400715,China;Chongqing Key Laboratory of Micro&Nano Structure Optoelectronics,Southwest University,Chongqing 400715,China;School of Electronic and Information Engineering,Southwest University,Chongqing 400715,China)

机构地区：[1]西南大学物理科学与技术学院,重庆400715 [2]西南大学微纳结构光电子学重庆市重点实验室,重庆400715 [3]西南大学电子信息工程学院,重庆400715

出　　处：《光子学报》2022年第6期324-333,共10页Acta Photonica Sinica

基　　金：National Natural Science Foundation of China(No.61875167);Fundamental Research Funds for the Central Universities of China(No.SWU120017)。

摘　　要：提出并实验研究了一种宽带可调谐微波频率梳(MFC)的产生方案。首先,通过单频电信号调制一个分布反馈半导体激光器(DFB-SL1),可以得到包含多条梳线的种子光学频率梳(OFC);然后,将种子OFC送入一个受同样单频信号驱动的相位调制器,可得到具有更多梳线的优化OFC;最后,将优化OFC注入到另一个DFB-SL(DFB-SL2)中,其输出通过光电转换后以获得宽带MFC。实验结果表明,采用频率为2.9 GHz的单频电信号,通过优化注入功率和两个DFB-SLs之间的频率失谐,可以获得幅度变化在±5 dB内带宽为55.1 GHz的MFC,且每条梳线的相位噪声均低于-98.66 dBc/Hz@10 kHz。通过改变单频电信号的频率并选择合适的工作参数,可以产生梳距可调谐的宽带MFC。Microwave Frequency Comb(MFC)has the unique advantage of simultaneously providing multiple continuous microwave signals and then plays an important role in some application fields such as satellite communication,remote sensing,distance measurement,and anti-interference detection.At present,sustained efforts have been paid to explore novel techniques to generate the MFCs signal with adjustable comb distance,pure comb line,power balance and broad bandwidth.In this work,a system scheme for generating broadband tunable MFC based on a modulated optical injection Semiconductor Laser(SL)is proposed and experimentally investigated.First,via a distributed feedback semiconductor laser(DFB-SL1)strongly modulated by a single-tone electrical signal,a seed Optical Frequency Comb(OFC)including a few comb lines can be obtained.Next,the seed OFC is sent into a phase modulator driven by the same single-tone electrical signal as that loaded on the DFB-SL1,thus a promoted OFC with more comb lines can be obtained.Finally,the promoted OFC is injected into another DFB-SL(DFB-SL2),except the regenerated injection OFC,another sub-OFC can be observed located nearby the red-shifted central wavelength of DFB-SL2.In this case,the whole OFC can be regarded as a combination of two sub-OFCs,and then a broadband MFC can be obtained through converting the output of DFB-SL2 into electrical signal by a photo-detector.The experimental results show that,by utilizing a single-tone electrical signal with a frequency of 2.9 GHz,under optimized injection power and frequency detuning between two DFB-SLs,an MFC with 55.1 GHz bandwidth within a±5 dB amplitude variation can be obtained,where the phase noise of each comb line is maintained below-98.66 dBc/Hz at 10 kHz frequency offset.Through varying the frequency of the single-tone electrical signal and selecting matched operating parameters,the comb spacing of generated broadband MFC can be tuned.Also,the variations of optimized MFC bandwidth with the frequency detuningΔf and injection power P_(inj) are a

关 键 词：分布反馈半导体激光器 微波频率梳 光学频率梳 相位调制 光电转换 

分 类 号：TN28.4[电子电信—物理电子学]