Ultra-broadband Kerr microcomb through soliton spectral translation

Gregory Moille (), Edgar F. Perez, Jordan R. Stone, Ashutosh Rao, Xiyuan Lu, Tahmid Sami Rahman, Yanne K. Chembo and Kartik Srinivasan ()
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Gregory Moille: NIST/University of Maryland
Edgar F. Perez: NIST/University of Maryland
Jordan R. Stone: NIST/University of Maryland
Ashutosh Rao: National Institute of Standards and Technology
Xiyuan Lu: National Institute of Standards and Technology
Tahmid Sami Rahman: NIST/University of Maryland
Yanne K. Chembo: University of Maryland
Kartik Srinivasan: NIST/University of Maryland

Nature Communications, 2021, vol. 12, issue 1, 1-9

Abstract: Abstract Broadband and low-noise microresonator frequency combs (microcombs) are critical for deployable optical frequency measurements. Here we expand the bandwidth of a microcomb far beyond its anomalous dispersion region on both sides of its spectrum through spectral translation mediated by mixing of a dissipative Kerr soliton and a secondary pump. We introduce the concept of synthetic dispersion to qualitatively capture the system’s key physical behavior, in which the second pump enables spectral translation through four-wave mixing Bragg scattering. Experimentally, we pump a silicon nitride microring at 1063 nm and 1557 nm to enable soliton spectral translation, resulting in a total bandwidth of 1.6 octaves (137–407 THz). We examine the comb’s low-noise characteristics, through heterodyne beat note measurements across its spectrum, measurements of the comb tooth spacing in its primary and spectrally translated portions, and their relative noise. These ultra-broadband microcombs provide new opportunities for optical frequency synthesis, optical atomic clocks, and reaching previously unattainable wavelengths.

Date: 2021
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DOI: 10.1038/s41467-021-27469-0

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