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

Ashutosh Rao; Gregory Moille; Xiyuan Lu; Daron A. Westly; Davide Sacchetto; Michael Geiselmann; Michael Zervas; Scott B. Papp; John Bowers; Kartik Srinivasan

doi:10.1038/s41377-021-00549-y

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

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- Towards integrated photonic interposers for processing octave-spanning microresonator frequency combs
- Towards integrated photonic interposers for processing octave-spanning microresonator frequency combs
- LSA 2021年10卷第6期页码：1099-1111
- Affiliations：
  
  1.Physical Measurement Laboratory, Microsystems and Nanotechnology Division, National Institute of Standards and Technology, Gaithersburg, MD 20899, USA
  2.Maryland NanoCenter, University of Maryland, College Park 20742 MD, USA
  3.Joint Quantum Institute, NIST/University of Maryland, College Park, MD 20742, USA
  4.Ligentec, EPFL Innovation Park, Batiment C, Lausanne, Switzerland
  5.Physical Measurement Laboratory, Time and Frequency Division, National Institute of Standards and Technology, Boulder, CO 80305, USA
  6.Department of Physics, University of Colorado, Boulder, CO 80309, USA
  7.Department of Electrical and Computer Engineering, University of California, Santa Barbara, CA 93106, USA
- Author bio：
  
  Ashutosh Rao (ashutosh.rao@nist.gov)
  Kartik Srinivasan (kartik.srinivasan@nist.gov)
- Funds：
- DOI：10.1038/s41377-021-00549-y
  中图分类号：
- 纸质出版日期：2021-06-30，
  
  网络出版日期：2021-05-26，
  
  收稿日期：2020-10-23，
  
  修回日期：2021-04-21，
  
  录用日期：2021-05-03
- Accepted：
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Towards integrated photonic interposers for processing octave-spanning microresonator frequency combs[J]. LSA, 2021,10(6):1099-1111.

Rao, A. et al. Towards integrated photonic interposers for processing octave-spanning microresonator frequency combs. Light: Science & Applications, 10, 1099-1111 (2021).
Towards integrated photonic interposers for processing octave-spanning microresonator frequency combs[J]. LSA, 2021,10(6):1099-1111. DOI： 10.1038/s41377-021-00549-y.

Rao, A. et al. Towards integrated photonic interposers for processing octave-spanning microresonator frequency combs. Light: Science & Applications, 10, 1099-1111 (2021). DOI： 10.1038/s41377-021-00549-y.

摘要

Abstract

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 photonics. Crucially

microcombs promise fully integrated miniaturized optical systems with unprecedented reductions in cost

size

weight

and power. However

the use of bulk free-space and fiber-optic components to process microcombs has restricted form factors to the table-top. Taking 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 devices. Experimentally

we confirm the requisite performance of the individual passive elements of the proposed interposer—octave-wide dichroics

multimode interferometers

and tunable ring filters

and implement the octave-spanning spectral filtering of a microcomb

central to the interposer

using silicon nitride photonics. Moreover

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 consolidation. Finally

we numerically confirm the feasibility of operating the proposed interposer synthesizer as a fully assembled system. Our 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

Keywords

references

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