基于双频泵浦正常色散碳化硅微环谐振腔的光频率梳设计  

Design of optical frequency comb based on dual frequency pumped normal dispersion silicon carbide microresonator

作　　者：高荣 杨亚楠 湛晨翌 张宗祯 邓宜 王子潇 梁坤[2] 冯素春[1] Gao Rong;Yang Ya-Nan;Zhan Chen-Yi;Zhang Zong-Zhen;Deng Yi;Wang Zi-Xiao;Liang Kun;Feng Su-Chun(Key Laboratory of All Optical Network and Advanced Telecommunication Network,Ministry of Education,Institute of Lightwave Technology,Beijing Jiaotong University,Beijing 100044,China;School of Electronic and Information Engineering,Beijing Jiaotong University,Beijing 100044,China)

机构地区：[1]北京交通大学光波技术研究所,全光网络与现代通信网教育部重点实验室,北京100044 [2]北京交通大学电子信息工程学院,北京100044

出　　处：《物理学报》2024年第3期116-125,共10页Acta Physica Sinica

基　　金：中央高校基本科研业务费专项资金(批准号:2021JBM002);国家自然科学基金(批准号:62275012,62335001)资助的课题。

摘　　要：提出一种利用锁相双频激光泵浦正常色散碳化硅微环谐振腔产生光频率梳的方案.对绝缘体上碳化硅微环谐振腔光波导进行色散调控,实现1550 nm波段平坦正常色散优化设计.利用Lugiato-Lefever方程对锁相双频激光泵浦正常色散碳化硅微环谐振腔的光频率梳产生进行仿真,研究了泵浦失谐量改变时光频率梳产生的时域和频域演化过程.同时探究了泵浦功率、微腔波导损耗、微腔色散、双频激光功率占比、双频激光频率间隔等各项参数对光频率梳产生的影响,仿真产生的光频率梳带宽可覆盖1500—1600 nm.仿真结果有助于推动基于正常色散碳化硅微环谐振腔的1550 nm波段高重复频率宽带光频率梳的研究和应用.The scheme of generating optical frequency comb(OFC)mainly includes mode-locked laser,electro-optic modulation comb,and nonlinear Kerr micro-resonator comb.The OFC with frequency spacing on the order of 10-200 GHz can be employed in optical communication,microwave photonics,and other fields.Silicon carbide(SiC)has aroused the considerable research interest in integrated nonlinear photonics owing to its high second nonlinear coefficient and third order nonlinear coefficient,low optical loss,without multiphoton absorption loss owing to the wide bandgap.Single soliton microcomb in anomalous group velocity dispersion regime based on a 4H-SiC-on-insulator thin film has been demonstrated with the relative lower pump to comb efficiency,while the OFC in normal dispersion regime based on the SiC microresonator has not been reported.The pump conversion efficiency of OFC in the normal dispersion regime is high,and the pump frequency detuning range for the OFC generation is large,which is conducive to the OFC generation and long-term stable operation.Since there is no modulation instability effect in normal dispersion regime,the key to generating the OFC in normal dispersion regime is that the initial state needs the assistance of a multi-frequency laser(or four-wave mixing sideband).The phase-locked dual-frequency laser can be regarded as a pulse pump laser source with wide pulse duration,which can be realized by integrated distributed feedback laser.In this paper,a scheme of generating OFC by pumping the normal dispersion SiC microresonator with phase locked dual-frequency laser is proposed.The flat normal dispersion in 1550 nm band is realized through dispersion engineering of the SiC microresonator.The effective mode field area of the TE0 fundamental mode at 1550 nm in the optimized SiC ridge waveguide is about 0.94μm^(2),and the nonlinear coefficient is about 3.69W^(-1)·m^(-1).Meanwhile,dispersion parameters of the microresonator with 100 GHz FSR are also obtained.The OFC generation pumped by a phase-locked dual-frequ

关 键 词：非线性光学 光频率梳 正常色散 微腔 

分 类 号：O437[机械工程—光学工程] TN751.2[理学—光学]