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- Title
Quiet point engineering for low-noise microwave generation with soliton microcombs.
- Authors
Triscari, Andrea C.; Tusnin, Aleksandr; Tikan, Alexey; Kippenberg, Tobias J.
- Abstract
Low-noise microwave signals can be efficiently generated with microresonator-based dissipative Kerr solitons (microcombs). However, the phase noise level in integrated microcombs is presently several orders of magnitude above the limit imposed by fundamental thermorefractive noise, resulting from residual pump laser frequency noise transduction to the soliton repetition rate. This effect can be substantially reduced by accessing a quiet point (QP) in the parameter space, where the transduction is compensated by the dispersive wave (DW) recoil, which conventionally relies on accidental mode crossings. Here we present a method to deterministically engineer the QP, both in terms of spectral width and position, and we discover a continuum of possible QPs within the soliton existence region. Using two controlled mode crossings, we obtain regions where the QPs interact with each other, extending the noise suppression range. Our work demonstrates a promising way to reach the fundamental limit of low-noise microwave generation in integrated microcombs. Quiet points (QPs) in chip-integrated microcomb platforms allow the cancellation of transduction noise arising due to the presence of Raman self-frequency shifts, but the conditions to exploit them are fortuitous and system-dependent. The authors propose a strategy to deterministically engineer QPs both in terms of spectral width and position.
- Subjects
MICROWAVE generation; PHASE noise; ENGINEERS; ENGINEERING; LASER pumping
- Publication
Communications Physics, 2023, Vol 6, Issue 1, p1
- ISSN
2399-3650
- Publication type
Article
- DOI
10.1038/s42005-023-01437-0