Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: On Coherent Optical Pulse Propagation in One-Dimensional Bragg Grating   The propagation of the solitary waves in the Bragg grating formed by array of
thin dielectric films is considered. We assume that the thin films of contain
the resonant molecules, which are evolved according to two-level atoms model,
which is used to description of the coherent optical pulses propagation. There
the alternative derivation of the Mantsyzov's equations is represented.

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The categories of this paper are: cond-mat
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The categories of this paper are: eess
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The categories of this paper are: bayes-an
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The categories of this paper are: hep-th
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The categories of this paper are: adap-org
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The categories of this paper are: comp-gas
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The categories of this paper are: hep-lat
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The categories of this paper are: stat
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The categories of this paper are: astro-ph
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The categories of this paper are: q-bio
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The categories of this paper are: dg-ga
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The categories of this paper are: plasm-ph
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The categories of this paper are: patt-sol
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The categories of this paper are: mtrl-th
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The categories of this paper are: q-alg
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The categories of this paper are: math