Journal
OPTICS LETTERS
Volume 47, Issue 18, Pages 4838-4841Publisher
Optica Publishing Group
DOI: 10.1364/OL.469950
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Funding
- National Key Research and Development Program of China [2019YFB2203103]
- National Natural Science Foundation of China [61705033, 62001086]
- Sichuan Province Science and Technology Support Program [2021YJ0095]
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This Letter presents a detailed experimental investigation on the phase coherence between two on-chip Kerr soliton microcombs and analyzes the physical and technical origins of the mutual phase noise between the microcombs. The techniques of 2-point locking and optical frequency division are explored to enhance the dual-microcomb phase coherence.
Dissipative Kerr soliton microcombs are believed to be a promising technique to build a dual-comb source for applications including precision laser metrology, fast laser spectroscopy, and high-speed optical signal processing. In this Letter, we conduct a detailed experimental investigation on the phase coherence between two on-chip Kerr soliton microcombs, where the underlying physical and technical origins that lead to the mutual phase noise between microcombs are analyzed. Moreover, the techniques of 2-point locking and optical frequency division are explored to enhance the dual-microcomb phase coherence, and we demonstrate the best phase noise down to -50 dBc/Hz at 1-Hz offset, -90 dBc/Hz at 1-kHz offset, and -120 dBc/Hz at 1-MHz offset. Our study provides a basic reference for both fundamental studies and practical applications of Kerr soliton dual microcombs that entail high mutual phase coherence. (C) 2022 Optica Publishing Group
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