Dissipative Kerr soliton generation in chip-scale nonlinear resonators has recently observed remarkable advances,spanning from massively parallel communications,to self-referenced oscillators,and to dual-comb spectroscopy.Often working in the anomalous dispersion regime,unique driving protocols and dispersion in these nonlinear resonators have been examined to achieve the soliton and soliton-like temporal pulse shapes and coherent fre-quency comb generation.The normal dispersion regime provides a complementary approach to bridge the non-linear dynamical studies,including the possibility of square pulse formation with flattop plateaus,or platicons.Here we report observations of square pulse formation in chip-scale frequency combs through stimulated pump-ing at one free spectral range and in silicon nitride rings with+55 fs2/mm normal group velocity dispersion.Tuning of the platicon frequency comb via a varied sideband modulation frequency is examined in both spectral and temporal measurements.Determined by second-harmonic autocorrelation and cross correlation,we observe bright square platicon pulse of 17 ps pulse width on a 19 GHz flat frequency comb.With auxiliary-laser-assisted thermal stabilization,we surpass the thermal bistable dragging and extend the mode-locking access to narrower 2 ps platicon pulse states,supported by nonlinear dynamical modeling and boundary limit discussions.

HAO LIU;SHU-WEI HUANG;WENTING WANG;JINGHUI YANG;MINGBIN YU;DIM-LEE KWONG;PIERRE COLMAN;CHEE WEI WONG

Fang Lu Mesoscopic Optics and Quantum Electronics Laboratory,University of California Los Angeles,Los Angeles,California 90095,USA;Department of Electrical,Computer,and Energy Engineering,University of Colorado Boulder,Boulder,Colorado 80309,USA;Institute of Microelectronics,Singapore,Singapore;Université de Bourgogne Franche-Comté,ICB,UMR CNRS 6303,Dijon,France

光子学研究（英文）

[1]HAO LIU;SHU-WEI HUANG;WENTING WANG;JINGHUI YANG;MINGBIN YU;DIM-LEE KWONG;PIERRE COLMAN;CHEE WEI WONG-.Stimulated generation of deterministic platicon frequency microcombs)[J].光子学研究（英文）,2022(08):1877-1885

platicon,flattop,platicons,with+55,fs2

Stimulated,generation,deterministic,frequency,microcombs,Dissipative,Kerr,soliton,chip,scale,nonlinear,resonators,has,recently,observed,remarkable,advances,spanning,from,massively,parallel,communications,self,referenced,oscillators,dual,spectroscopy,Often,working,anomalous,dispersion,regime,unique,driving,protocols,these,have,been,examined,achieve,like,temporal,pulse,shapes,coherent,normal,provides,complementary,approach,bridge,dynamical,studies,including,possibility,square,formation,plateaus,Here,report,observations,through,stimulated,pump,one,free,spectral,range,silicon,nitride,rings,group,velocity,Tuning,via,varied,sideband,modulation,both,measurements,Determined,by,second,harmonic,autocorrelation,cross,bright,ps,width,GHz,With,auxiliary,laser,assisted,thermal,stabilization,surpass,bistable,dragging,extend,locking,access,narrower,states,supported,modeling,boundary,limit,discussions

0.577026