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

Ashutosh Rao1,2, Gregory Moille3,4, Xiyuan Lu3,5

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Researchers developed an integrated photonics interposer architecture to miniaturize microcomb systems. This innovation enables on-chip processing of optical frequency combs, paving the way for compact metrology and navigation devices.

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Area of Science:

  • Integrated Photonics
  • Micro-optics
  • Optical Frequency Combs

Background:

  • Microcombs, or optical frequency combs generated in microresonators, offer significant advantages for applications like frequency metrology, navigation, and spectroscopy.
  • Current microcomb systems are limited to table-top form factors due to the reliance on bulky free-space and fiber-optic components for signal processing.
  • There is a critical need for miniaturized, integrated solutions to enable widespread adoption of microcomb technology.

Purpose of the Study:

  • To propose and experimentally validate an integrated photonics interposer architecture for on-chip processing of microcomb-based optical signals.
  • To address the challenge of miniaturizing microcomb systems by replacing discrete components with an integrated solution.
  • To demonstrate the feasibility of integrating octave-wide microcomb signal processing for applications such as optical frequency synthesis.

Main Methods:

  • Designed and implemented an integrated photonics interposer architecture for collecting, routing, and interfacing octave-wide microcomb signals.
  • Experimentally characterized passive photonic elements including dichroics, multimode interferometers, and tunable ring filters.
  • Utilized silicon nitride photonics for octave-spanning spectral filtering and demonstrated integration of thick and thin silicon nitride layers via adiabatic evanescent coupling.

Main Results:

  • Confirmed the performance of individual passive elements within the interposer architecture.
  • Successfully implemented octave-spanning spectral filtering of a microcomb using silicon nitride photonics.
  • Demonstrated a viable method for integrating dissimilar silicon nitride layers, crucial for soliton generation and interposer functionality.
  • Numerically confirmed the system-level feasibility of the proposed interposer synthesizer.

Conclusions:

  • The proposed interposer architecture effectively addresses the need for on-chip microcomb processing, enabling significant miniaturization of microcomb systems.
  • This integrated approach paves the way for compact, cost-effective, and power-efficient optical systems.
  • The architecture is adaptable for various metrology-grade applications, including optical atomic clocks, high-precision navigation, and spectroscopy.