Submilliwatt, widely tunable coherent microcomb generation with feedback-free operation

作     者：Haowen Shu Lin Chang Chenghao Lao Bitao Shen Weiqiang Xie Xuguang Zhang Ming Jin Yuansheng Tao Ruixuan Chen Zihan Tao Huajin Chang Shaohua Yu Qifan Yang Xingjun Wang John E.Bowers Haowen Shu;Lin Chang;Chenghao Lao;Bitao Shen;Weiqiang Xie;Xuguang Zhang;Ming Jin;Yuansheng Tao;Ruixuan Chen;Zihan Tao;Huajin Chang;Shaohua Yu;Qifan Yang;Xingjun Wang;John E.Bowers

作者机构：Peking UniversitySchool of ElectronicsState Key Laboratory of Advanced Optical Communication Systems and NetworksBeijingChina University of CaliforniaSanta BarbaraDepartment of Electrical and Computer EngineeringSanta BarbaraCaliforniaUnited States Peking UniversitySchool of PhysicsState Key Laboratory for Artificial Microstructure and Mesoscopic PhysicsBeijingChina Peng Cheng LaboratoryShenzhenChina Peking UniversityFrontiers Science Center for Nano-OptoelectronicsBeijingChina 

出 版 物：《Advanced Photonics》 (先进光子学（英文）)

年 卷 期：2023年第5卷第3期

页      面：144-154页

核心收录：

学科分类：080901[工学-物理电子学] 0809[工学-电子科学与技术（可授工学、理学学位）] 0806[工学-冶金工程] 08[工学] 080401[工学-精密仪器及机械] 0804[工学-仪器科学与技术] 0803[工学-光学工程] 0811[工学-控制科学与工程] 0702[理学-物理学] 

主　　题：dark-pulse microcomb direct pumping scheme widely tunable source 

摘      要：Microcombs are revolutionizing optoelectronics by providing parallel, mutually coherent wavelengthchannels for time-frequency metrology and information processing. To implement this essential function inintegrated photonic systems, it is desirable to drive microcombs directly with an on-chip laser in a simpleand flexible way. However, two major difficulties have prevented this goal: (1) generating mode-lockedcomb states usually requires a significant amount of pump power and (2) the requirement to align laser andresonator frequency significantly complicates operation and limits the tunability of the comb lines. Here, weaddress these problems by using microresonators on an AlGaAs on-insulator platform to generate dark-pulsemicrocombs. This highly nonlinear platform dramatically relaxes fabrication requirements and leads to arecord-low pump power of 1 mW for coherent comb generation. Dark-pulse microcombs facilitated bythermally controlled avoided mode crossings are accessed by direct distributed feedback laser *** any feedback or control circuitries, the comb shows good coherence and stability. With around150 mW on-chip power, this approach also leads to an unprecedentedly wide tuning range of over one freespectral range (97.5 GHz). Our work provides a route to realize power-efficient, simple, and reconfigurablemicrocombs that can be seamlessly integrated with a wide range of photonic systems.