Coherent Combining for High‐Power Kerr Combs

Kim, Bok Young; Okawachi, Yoshitomo; Jang, Jae K.; Ji, Xingchen; Lipson, Michal; Gaeta, Alexander L.

doi:10.1002/lpor.202200607

Coherent Combining for High‐Power Kerr Combs

Journal Article · Wed Jun 21 00:00:00 EDT 2023 · Laser & Photonics Reviews

DOI:https://doi.org/10.1002/lpor.202200607· OSTI ID:1995343

^[1]; Okawachi, Yoshitomo ^[1]; Jang, Jae K. ^[1]; Ji, Xingchen ^[2]; Lipson, Michal ^[3]; Gaeta, Alexander L. ^[3]

Department of Applied Physics and Applied Mathematics Columbia University New York NY 10027 USA
Department of Electrical Engineering Columbia University New York NY 10027 USA
Department of Applied Physics and Applied Mathematics Columbia University New York NY 10027 USA, Department of Electrical Engineering Columbia University New York NY 10027 USA

Abstract

Kerr frequency combs enable the miniaturization of comb sources for applications such as data communications and spectroscopy. However, due to the high field confinement and effective nonlinearity, Kerr combs typically operate with low output comb powers. While nonsolitonic Kerr combs operating in the normal group velocity dispersion (GVD) regime can access high pump‐to‐comb conversion efficiencies and relatively flat spectral profiles, many frequency comb applications require even higher comb‐line powers that are otherwise fundamentally unattainable without the use of optical amplifiers. A high efficient coherent beam combining of Kerr combs is demonstrated via on‐chip synchronization to greatly enhanced comb‐line powers. Two normal GVD Kerr combs are coherently combined for a 2.9 dB increase in comb power compared to a single comb while maintaining a high total pump‐to‐comb conversion efficiency of 26%. Lastly, it is shown that via spectral engineering of two normal GVD combs, it should be possible to significantly increase the spectral flatness of a combined comb. This platform enables fully integrated systems with powers that can readily exceed that of an individual comb system by more than an order of magnitude.

View Accepted Manuscript (Publisher)

Sponsoring Organization:: USDOE

Grant/Contract Number:: NONE; AR0000843

OSTI ID:: 1995343

Journal Information:: Laser & Photonics Reviews, Journal Name: Laser & Photonics Reviews Journal Issue: 8 Vol. 17; ISSN 1863-8880

Publisher:: Wiley Blackwell (John Wiley & Sons)Copyright Statement

Country of Publication:: Germany

Language:: English

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