
1.Department of Electronic Engineering, Beijing National Research Center for Information Science and Technology, Tsinghua University, 100084 Beijing, China
2.Laboratoire ICB, UMR 6303 CNRS, Université Bourgogne Franche-Comté, 21000 Dijon, France
Xiaoxiao Xue (xuexx@tsinghua.edu.cn)
Xiaoping Zheng (xpzheng@tsinghua.edu.cn)
Published:31 January 2023,
Published Online:9 January 2023,
Received:10 July 2022,
Revised:26 October 2022,
Accepted:27 November 2022
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Xue, X. X. et al. Dispersion-less Kerr solitons in spectrally confined optical cavities. Light: Science & Applications, 12, 136-146 (2023).
Xue, X. X. et al. Dispersion-less Kerr solitons in spectrally confined optical cavities. Light: Science & Applications, 12, 136-146 (2023). DOI: 10.1038/s41377-022-01052-8.
Solitons are self-reinforcing localized wave packets that manifest in the major areas of nonlinear science
from optics to biology and Bose–Einstein condensates. Recently
optically driven dissipative solitons have attracted great attention for the implementation of the chip-scale frequency combs that are decisive for communications
spectroscopy
neural computing
and quantum information processing. In the current understanding
the generation of temporal solitons involves the chromatic dispersion as a key enabling physical effect
acting either globally or locally on the cavity dynamics in a decisive way. Here
we report on a novel class of solitons
both theoretically and experimentally
which builds up in spectrally confined optical cavities when dispersion is practically absent
both globally and locally. Precisely
the interplay between the Kerr nonlinearity and spectral filtering results in an infinite hierarchy of eigenfunctions which
combined with optical gain
allow for the generation of stable dispersion-less dissipative solitons in a previously unexplored regime. When the filter order tends to infinity
we find an unexpected link between dissipative and conservative solitons
in the form of Nyquist-pulse-like solitons endowed with an ultra-flat spectrum. In contrast to the conventional dispersion-enabled nonlinear Schrödinger solitons
these dispersion-less Nyquist solitons build on a fully confined spectrum and their energy scaling is not constrained by the pulse duration. Dispersion-less soliton molecules and their deterministic transitioning to single solitons are also evidenced. These findings broaden the fundamental scope of the dissipative soliton paradigm and open new avenues for generating soliton pulses and frequency combs endowed with unprecedented temporal and spectral features.
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