Ultra-compact lithium niobate microcavity electro-optic modulator beyond 110 GHz
作者机构：State Key Laboratory for Modern Optical InstrumentationCentre for Optical and Electromagnetic ResearchCollege of Optical Science and EngineeringInterna-tional Research Center for Advanced PhotonicsZhejiang UniversityZijingang CampusHangzhou 310058China Ningbo Research InstituteZhejiang Uni-versityNingbo 315100China Jiaxing Key Laboratory of Photonic Sensing&Intelligent ImagingJiaxing 314000China Intelligent Optics&Photonics Re-search CenterJiaxing Research Institute Zhejiang UniversityJiaxing 314000China
出 版 物：《Chip》 (芯片（英文）)
年 卷 期：2022年第1卷第4期
页 面：29-36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）] 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]
基 金：supported by National Major Research and De-velopment Program(No.2018YFB2200200/2018YFB2200201) National Science Fund for Distinguished Young Scholars(61725503) National Natural Science Foundation of China(NSFC)(91950205,61961146003,92150302,62105283) Zhejiang Provincial Natural Science Foundation(LD19F050001) Zhejiang Provincial Major Research and Development Pro-gram(No.2021C01199) Leading Innovative and Entrepreneur Team Intro-duction Program of Zhejiang(2021R01001) the Fundamental Research Funds for the Central Universities
主 题：Lithium niobate Microcavity Electro-optic Modulator
摘 要：A lithium-niobate-on-insulator(LNOI)electro-optic(EO)modulator based on a 2×2 FP-cavity was designed and realized with an ultra-compact footprint and an ultra-high bandwidth.A comprehensive analysis on the present LNOI FP-cavity modulator was conducted to reveal the dependence of modulation bandwidth and modulation effi-ciency on the cavity Q-factor and the operation wavelength detuning to the *** particular,the 2×2 FP cavity was designed to achieve an optimal Q factor by reducing the reflectivity of reflectors and the cavity length,thus reducing the photon lifetime in the *** ultra-short effective cavity length of only∼50μm was achieved for the designed LNOI FP-cavity modulator,with itsfootprint being as compact as∼4×500μm *** was demonstrated theoretically that the modulation bandwidth could be improved significantly to be over 200 GHz by utilizing the peaking enhancement *** fabricated device exhibited an excess loss of∼1 dB and an extinction ratio of∼20 dB in experiments,while the measured 3-dB bandwidth was higher than 110 GHz(beyond the maximal range of the facilities in experiments).Up till now,to our best knowledge,this has been the first LNOI microcavity modulator with a bandwidth higher than 110 ***,high-quality eye-diagrams of 100 Gbps on-off keying(OOK)and 140 Gbps 4-pulse amplitude modulation(PAM4)signals were demonstrated experimentally,and the energy consumption for the OOK signals was as low as 4.5 fJ/bit.
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