Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: MCF solitons and laser pulse self-compression at light bullet excitation
  in the central core of MCF   The propagation of laser pulses in multi-core fibers (MCF) made of a central
core and an even number of cores located in a ring around it is studied.
Approximate quasi-soliton homogeneous solutions of the wave field in the
considered MCF are found. The stability of the in-phase soliton distribution is
shown analytically and numerically. At low energies, its wave field is
distributed over all MCF cores and has a duration, which exceeds the duration
of the NSE soliton with the same energy by many (five-six) times. On the
contrary, almost all of the radiation at high energies is concentrated in the
central core with a duration similar to the NSE soliton. The transition between
the two types of distributions is very sharp and occurs at a critical energy,
which is weakly dependent on the number of cores and on the coupling
coefficient with the central core. The self-compression mechanism of laser
pulses was proposed. It consists in injecting such MCF with a wave packet being
similar to the found soliton and having an energy larger than the critical
value. It is shown that the compression ratio weakly depends on the energy and
the number of cores and is approximately equal to 6 times with an energy
efficiency of almost 100\%. The use of longer laser pulses allows one to
increase the compression ratio up to 30-40 times with an energy efficiency of
more than 50\%. The obtained analytical estimates of the compression ratio and
its efficiency are in good agreement with the results of numerical simulation.

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The categories of this paper are: alg-geom
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The categories of this paper are: stat
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The categories of this paper are: nucl-th
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The categories of this paper are: chao-dyn
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The categories of this paper are: math-ph
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The categories of this paper are: hep-ex
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The categories of this paper are: quant-ph
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The categories of this paper are: hep-lat
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The categories of this paper are: supr-con
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The categories of this paper are: funct-an
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The categories of this paper are: nucl-ex
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The categories of this paper are: eess
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The categories of this paper are: math
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The categories of this paper are: adap-org
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The categories of this paper are: plasm-ph
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The categories of this paper are: atom-ph