On-chip optical vector analysis based on thin-film lithium niobate single-sideband modulators  

作　　者：Hanke Feng Tong Ge Yaowen Hu Zhenzheng Wang Yiwen Zhang Zhaoxi Chen Ke Zhang Wenzhao Sun Cheng Wang 

机构地区：[1]City University of Hong Kong,Department of Electrical Engineering and State Key Laboratory of Terahertz and Millimeter Waves,Kowloon,Hong Kong,China [2]Peking University,State Key Laboratory for Mesoscopic Physics and Frontiers Science Center for Nano-Optoelectronics,School of Physics,Beijing,China [3]Harvard University,John A.Paulson School of Engineering and Applied Sciences,Cambridge,Massachusetts,United States [4]City University of Hong Kong(Dongguan),Dongguan,China [5]City University of Hong Kong Shenzhen Research Institute,Center of Information and Communication Technology,Shenzhen,China

出　　处：《Advanced Photonics》2024年第6期99-110,共12页先进光子学(英文)

基　　金：supported by the Research Grants Council,University Grants Committee(CityU 11212721,CityU 11204022,N_CityU113/20,C1002-22Y);Croucher Foundation(9509005).

摘　　要：Optical vector analysis(OVA)is an enabling technology for comprehensively characterizing both amplitude and phase responses of optical devices or systems.Conventional OVA technologies are mostly based on discrete optoelectronic components,leading to unsatisfactory system sizes,complexity,and stability.They also encounter challenges in revealing the on-chip characteristics of integrated photonic devices,which are often overwhelmed by the substantial coupling loss and extra spectral response at chip facets.In this work,we demonstrate a miniaturized OVA system based on broadband single-sideband(SSB)modulators on a thin-film lithium niobate(LN)platform.The OVA could provide a direct probe of both amplitude and phase responses of photonic devices with kilohertz-level resolution and tens of terahertz of measurement bandwidth.We perform in situ characterizations of single and coupled microring resonators fabricated on the same chip as the OVA,unfolding their intrinsic loss and coupling states unambiguously.Furthermore,we achieve the direct measurement of collective phase dynamics and density of states of the Bloch modes in a synthetic frequency crystal by in situ OVA of a dynamically modulated microring resonator.Our OVA system provides a compact,high-precision,and broadband solution for characterizing future integrated photonic devices and circuits,with potential applications ranging from optical communications,biosensing,and neuromorphic computing,to quantum information processing.

关 键 词：optical vector analysis thin film lithium niobate integrated microwave photonics 

分 类 号：TN25[电子电信—物理电子学]