Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Dark breathers in a normal dispersion optical microresonator   Breathers are localized waves, that are periodic in time or space. The
concept of breathers is useful for describing many physical systems including
granular lattices, Bose-Einstein condensation, hydrodynamics, plasmas and
optics. Breathers could exist in both the anomalous and the normal dispersion
regime. However, the demonstration of optical breathers in the normal
dispersion regime remains elusive to our knowledge. Kerr comb generation in
optical microresonators provides an array of oscillators that are highly
coupled via the Kerr effect, which can be exploited to explore the breather
dynamics. Here, we present, experimentally and numerically, the observation of
dark breathers in a normal dispersion silicon nitride microresonator. By
controlling the pump wavelength and power, we can generate the dark breather,
which exhibits an energy exchange between the central lines and the lines at
the wing. The dark breather breathes gently and retains a dark-pulse waveform.
A transition to a chaotic breather state is also observed by increasing the
pump power. These dark breather dynamics are well reproduced by numerical
simulations based on the Lugiato-Lefever equation. The results also reveal the
importance of dissipation to dark breather dynamics and give important insights
into instabilities related to high power dark pulse Kerr combs from normal
dispersion microreosnators.

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The categories of this paper are: cs
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The categories of this paper are: chem-ph
36
The categories of this paper are: cmp-lg
10
The categories of this paper are: q-bio
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The categories of this paper are: hep-ph
22
The categories of this paper are: chao-dyn
32
The categories of this paper are: atom-ph
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The categories of this paper are: astro-ph
13
The categories of this paper are: quant-ph
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The categories of this paper are: math-ph
8
The categories of this paper are: hep-ex
31
The categories of this paper are: ao-sci
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The categories of this paper are: comp-gas
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The categories of this paper are: alg-geom
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The categories of this paper are: hep-th
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The categories of this paper are: nucl-th