基于光注入电流调制弱谐振腔法布里珀罗激光器获取光学频率梳  

Optical Frequency Comb Generation Based on a Current-modulated Weak-resonant-cavity Fabry-Perot Laser Diode Subject to Optical Injection

作　　者：柳颖东 夏光琼[1,2] 樊利 张竣珲[1,2] 林恭如 刘俊岐 吴正茂[1,2] LIU Yingdong;XIA Guangqiong;FAN Li;ZHANG Junhui;LIN Gongru;LIU Junqi;WU Zhengmao(School of Physical Science and Technology,Southwest University,Chongqing 400715,China;Chongqing Key Laboratory of Micro&Nano Structure Optoelectronics,Chongqing 400715,China;School of Electronic and Information Engineering,Southwest University,Chongqing 400715,China;Department of Electrical Engineering,Taiwan University,Taipei 10617,China;Key Laboratory of Semiconductor Materials Science,Institute of Semiconductors,Chinese Academy of Sciences,Beijing 100083,China)

机构地区：[1]西南大学物理科学与技术学院,重庆400715 [2]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 [4]台湾大学电机工程学系,中国台北10617 [5]中国科学院半导体研究所半导体材料科学重点实验室,北京100083

出　　处：《光子学报》2024年第5期169-179,共11页Acta Photonica Sinica

基　　金：国家自然科学基金(Nos.62335015,61875167);重庆市自然科学基金(No.CSTB2022NSCQ‒MSX0313)。

摘　　要：提出了一种基于电流调制弱谐振腔法布里珀罗激光器在外部光注入下产生光学频率梳的方案,实验研究了关键参量对所产生的光学频率梳性能的影响。在该方案中,首先采用频率为1.6 GHz(激光器弛豫振荡频率)、功率为19 dBm的正弦信号直接电流调制弱谐振腔法布里珀罗激光器,使其进入增益开关状态;进一步引入单光注入以及双光注入以获取高性能光学频率梳。实验研究结果表明:采用单光注入时,在合适的注入光功率条件下,连续变化注入光波长可使产生的光学频率梳的中心波长在1525~1560 nm内实现连续调谐。光学频率梳的梳线数目呈现周期性变化,变化周期为激光器的纵模间距0.28 nm(35 GHz);在给定注入光波长条件下,逐渐增加注入光功率,光学频率梳的梳线数目先在一个较高水平附近振荡,然后急剧下降,最后趋于平缓,而光学频率梳的载噪比呈现先增加后饱和的趋势;在优化单光注入参数条件下,获得了梳线功率在10 dB变化范围内包含49根梳线的光学频率梳。引入额外的注入光构建双光注入,在优化的参数条件下,获得了梳线功率在10 dB变化范围内包含92根梳线的光学频率梳。最后,对单光注入和双光注入以及不同注入波长间距的双光注入所产生的光学频率梳各梳齿之间的相干性进行了分析,发现各种光注入方式下所产生的光学频率梳各梳齿之间均具有强的相干性,其拍频信号中基频的单边带相位噪声均处于−125.0 dBc/Hz@10 kHz左右的水平。Optical Frequency Combs(OFC)is a special type of laser source,for which the time series is a series of narrow pulses and meanwhile the spectrum presents a series of discrete,equally spaced,strongly coherent comb lines.OFC effectively establish the connection between optical frequency and microwave frequency,and promote the development of many fields such as precision metrology,microwave photonics,optical fiber communication,etc.Since the first generation of OFC based on mode-locking technology in 2000,a variety of generation schemes have been reported based on microcavity,electrooptical modulator,Semiconductor Lasers(SLs)and other devices.Among them,the scheme for generating OFC based on current-modulated SLs under optical injection has attracted much attention due to its advantages such as simple system structure,low cost,integrability,and flexible adjustment of comb spacing.At present,SLs utilized in such a scheme are mostly single longitudinal mode SLs including Distributed Feedback Semiconductor Lasers(DFB-SLs),Vertical-Cavity Surface-Emitting Lasers(VCSELs),etc.Constrained by a limited range of wavelength tuning for such single longitudinal mode SLs,it is difficult to obtain the OFC whose central wavelength can be tuned within a wide range.In order to meet the demand for OFC with tunable center wavelength in some special applications,some schemes based on Fabry-Perot laser diode(FP-LD)have been proposed successively for generating OFC with tunable center wavelength.For FP-LD,there exist multi-longitudinal modes in cavity,which can be oscillated simultaneously.Through varying the wavelength of injection light,different mode with different wavelength in gain-switched FP-LD can be become the main oscillation mode,and therefore the central wavelength of generated OFC can be detuned easily.However,for FP-LD,there exist power fluctuation among the longitudinal modes due to mode selection characteristics of the laser cavity and the gain depended on the wavelength.At the same time,the power of the current-modulated

关 键 词：弱谐振腔法布里珀罗激光器 光学频率梳 电流调制 增益开关 光注入 

分 类 号：TN248.4[电子电信—物理电子学]