摘要
提出并实验验证一种级联啁啾光纤光栅反馈半导体激光器产生宽带、无时延混沌激光的方法。在该方法中,级联啁啾光纤光栅的高色散引入不规则的外腔模式,破坏了外腔模式谐振,进而消除混沌信号的时延特征。此外,不规则的外腔模式与激光器内部模式拍频,引入了新的高频振荡,进而增强混沌信号的带宽。对比研究了单个与级联啁啾光纤光栅反馈系统中色散光反馈强度、激光器与光栅波长失谐对混沌信号带宽及其时延特征的影响。结果表明,在强反馈、负波长失谐的条件下,级联反馈系统具有更好的带宽增强与时延特征抑制效果,获得了3 dB带宽12 GHz且无时延特征的混沌信号。
Using a semiconductor laser subjected to optical feedback from cascaded chirped fiber Bragg gratings(CFBGs),we propose and demonstrate a method for generating wideband chaos without a time-delay signature(TDS).The high dispersion of cascaded CFBGs creates irregular external-cavity modes and destroys the resonance of external-cavity mode,eliminating the TDS of the chaotic signal.In addition,the irregular external-cavity modes beat with the internal-cavity modes of the laser,introducing new high-frequency oscillations,which enhances the bandwidth of the chaotic signal.The effects of the dispersive optical feedback strength and wavelength detuning between the laser and CFBG on bandwidth and TDS in feedback systems with single CFBG and cascaded CFBGs were compared in the experiment.The obtained results show that the feedback system with cascaded CFBGs exhibits better performances in bandwidth improvement and TDS suppression under strong feedback and negative wavelength detuning conditions.Finally,we experimentally obtained a TDS-free chaotic signal with a 3 dB bandwidth of 12 GHz.
作者
王翔宇
王龙生
郭园园
贾志伟
王安帮
王云才
Wang Xiangyu;Wang Longsheng;Guo Yuanyuan;Jia Zhiwei;Wang Anbang;Wang Yuncai(Key Laboratory of Advanced Transducers and Intelligent Control System,Ministry of Education(Taiyuan University of Technology),Taiyuan,Shanxi 030024,China;College of Physics and Optoelectronics,Taiyuan University of Technology,Taiyuan,Shanxi 030024,China;School of Information Engineering,Guangdong University of Technology,Guangzhou,Guangdong 510006,China;Guangdong Provincial Key Laboratory of Photonics Information Technology,Guangzhou,Guangdong 510006,China)
出处
《激光与光电子学进展》
CSCD
北大核心
2022年第3期179-185,共7页
Laser & Optoelectronics Progress
基金
国家重点研发计划(2019YFB1803500)
国家自然科学基金(61822509,62035009,61713014,61927811,61961136002,61805170,61805171,61805168)
山西人才计划(201805D211027)
山西“1331项目”重点创新研究团队
山西省高等学校优秀中青年创新人才计划
山西省重点研发计划国际科技合作项目(201903D421012)
广东省创新创业团队计划。
关键词
激光光学
半导体激光器
啁啾光纤光栅
宽带混沌
时延特征
laser optics
semiconductor laser
chirped fiber Bragg grating
wideband chaos
time-delay signature
