Near-zero-dispersion soliton and broadband modulational instability Kerr microcombs in anomalous dispersion  

作　　者：Zeyu Xiao Tieying Li Minglu Cai Hongyi Zhang Yi Huang Chao Li Baicheng Yao Kan Wu Jianping Chen 

机构地区：[1]State Key Laboratory of Advanced Optical Communication Systems and Networks,School of Electronic Information and Electrical Engineering,Department of Electronic Engineering,Shanghai Jiao Tong University,Shanghai 200240,China [2]Key Laboratory of Optical Fibre Sensing and Communications(Education Ministry of China),University of Electronic Science and Technology of China,Chengdu 611731,China

出　　处：《Light(Science & Applications)》2023年第2期220-231,共12页光（科学与应用)（英文版）

基　　金：This work is supported by the National Nature Science Foundation of China(NSFC)(Nos.61922056,61875122).

摘　　要：The developing advances of microresonator-based Ker cavity solitons have enabled versatile applications ranging from communication,signal processing to high-precision measurements.Resonator dispersion is the key factor determining the Kerr comb dynamics.Near the zero group-velocity-dispersion(GVD)regime,low-noise and broadband microcomb sources are achievable,which is crucial to the application of the Kerr soliton.When the GVD is almost vanished,higher-order dispersion can significantly affect the Kerr comb dynamics.Although many studies have investigated the Kerr comb dynamics near the zero-dispersion regime in microresonator or fiber ring system,limited by dispersion profles and dispersion perturbations,the near-zero-dispersion soliton structure pumped in the anomalous dispersion side is still elusive so far.Here,we theoretically and experimentally investigate the microcomb dynamics in fiber-based Fabry-Perot microresonator with ultra-small anomalous GVD.We obtain 2/3-octave-spaning microcombs with~10 GHz spacing,>84 THz span,and>8400 comb lines in the modulational instability(MI)state,without any external nonlinear spectral broadening.Such widely-spanned Ml combs are also able to enter the soliton state.Moreover,we report the first observation of anomalous-dispersion based near-zero-dispersion solitons,which exhibits a local repetition rate up to 8.6 THz,an individual pulse duration<100 fs,a span>32 THz and>3200 comb lines.These two distinct comb states have their own advantages.The broadband MI combs possess high conversion efficiency and wide existing range,while the near-zero-dispersion soliton exhibits relatively low phase noise and ultra-high local repetition rate.This work complements the dynamics of Kerr cavity soliton near the zero-dispersion regime,and may stimulate cross-disciplinary inspirations ranging from dispersion-controlled microresonators to broadband coherent comb devices.

关 键 词：RESONATOR DISPERSION PUMPED 

分 类 号：TN2[电子电信—物理电子学]