Spectral extension and synchronization of microcombs in a single microresonator

Language
en
Document Type
Article
Issue Date
2023-05-23
First published
2020-12-14
Issue Year
2020
Authors
Zhang, Shuangyou
Silver, Jonathan M.
Bi, Toby
Del’Haye, Pascal
Editor
Publisher
Nature Publishing Group UK
Abstract

Abstract Broadband optical frequency combs are extremely versatile tools for precision spectroscopy, ultrafast ranging, as channel generators for telecom networks, and for many other metrology applications. Here, we demonstrate that the optical spectrum of a soliton microcomb generated in a microresonator can be extended by bichromatic pumping: one laser with a wavelength in the anomalous dispersion regime of the microresonator generates a bright soliton microcomb while another laser in the normal dispersion regime both compensates the thermal effect of the microresonator and generates a repetition-rate-synchronized second frequency comb. Numerical simulations agree well with experimental results and reveal that a bright optical pulse from the second pump is passively formed in the normal dispersion regime and trapped by the primary soliton. In addition, we demonstrate that a dispersive wave can be generated and influenced by cross-phase-modulation-mediated repetition-rate synchronization of the two combs. The demonstrated technique provides an alternative way to generate broadband microcombs and enables the selective enhancement of optical power in specific parts of a comb spectrum.

Journal Title
Nature Communications
Volume
11
Issue
1
Citation
Nature Communications 11.1 (2020): 6384. <https://www.nature.com/articles/s41467-020-19804-8>
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