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Towards integrated photonic interposers for processing octave-spanning microresonator frequency combs

Light(Science & Applications) 2021年第6期10卷 1099-1111页

作者： Ashutosh Rao Gregory Moille Xiyuan Lu Daron A.Westly Davide Sacchetto michael Geiselmann michael zervas Scott B.Papp John Bowers Kartik Srinivasan Physical Measurement Laboratory Microsystems and Nanotechno logy DivisionNational Institute of Standards and TechnologyGaithersburgMD 20899USA Maryland NanoCenter University of MarylandCollege Park 20742 MDUSA Joint Quantum Institute NIST/University of MarylandCollege ParkMD 20742USA Ligentec EPFL Innovation ParkBatiment CLausanneSwitzerland Physical Measurement Laboratory Time and Frequency DivisionNational Institute of Standards and TechnologyBoulderCO 80305USA Department of Physics University of ColoradoBoulderCO 80309USA Department of Electrical and Computer Engineering University of CaliforniaSanta BarbaraCA 93106USA

Microcombs-optical frequency combs generated in microresonators-have advanced tremendously in the past decade,and are advantageous for applications in frequency metrology,navigation,spectroscopy,telecommunications,and microwave ***,microcombs promise fully integrated miniaturized optical systems with unprecedented reductions in cost,size,weight,and ***,the use of bulk free-space and fiber-optic comp on ents to process microcombs has restricted form factors to the *** microcomb-based optical frequency synthesis around 1550 nm as our target application,here,we address this challenge by proposing an integrated photonics interposer architecture to replace discrete components by collecting,routing,and interfacing octave-wide microcomb-based optical signals between photonic chiplets and heterogeneously integrated ***,we con firm the requisite performa nee of the individual passive elements of the proposed interposer一octave-wide dichroics,multimode interferometers,and tunable ring filters,and implement the octave-spanning spectral filteri ng of a microcomb,central to the in terposer,using silicon n itride phot ***,we show that the thick silicon nitride needed for bright dissipative Kerr soliton generation can be integrated with the comparatively thin silicon nitride interposer layer through octave-bandwidth adiabatic evanescent coupling,indicating a path towards future system-level *** ally,we numerically confirm the feasibility of operating the proposed in terposer synthesizer as a fully assembled *** interposer architecture addresses the immediate need for on-chip microcomb processing to successfully miniaturize microcomb systems and can be readily adapted to other metrology-grade applications based on optical atomic clocks and high-precision navigation and spectroscopy.

关键词： resonator interferometer synthesizer

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