Power-Efficient Generation Of Two-Octave Mid-Ir Frequency Combs In A Germanium Microresonator

Keywords

dispersion engineering; integrated optics devices; mid-infrared; nonlinear optics; optical frequency comb

Abstract

Octave-spanning frequency comb generation in the deep mid-infrared (>5.5 μm) typically requires a high pump power, which is challenging because of the limited power of narrow linewidth lasers at long wavelengths. We propose twofold dispersion engineering for a Ge-on-Si microcavity to enable both dispersion flattening and dispersion hybridization over a wide band from 3.5 to 10 μm. A two-octave mode-locked Kerr frequency comb can be generated from 2.3 to 10.2 μm, with a pump power as low as 180 mW. It has been shown that dispersion flattening greatly enhances the spectral broadening of the generated comb, whereas dispersion hybridization improves its spectral flatness.

Publication Date

1-1-2018

Publication Title

Nanophotonics

Volume

7

Issue

8

Number of Pages

1461-1467

Document Type

Article

Personal Identifier

scopus

DOI Link

https://doi.org/10.1515/nanoph-2017-0131

Socpus ID

85051240152 (Scopus)

Source API URL

https://api.elsevier.com/content/abstract/scopus_id/85051240152

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