Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Synchronization of Mutually Versus Unidirectionally Coupled Chaotic
  Semiconductor Lasers   Synchronization dynamics of mutually coupled chaotic semiconductor lasers are
investigated experimentally and compared to identical synchronization of
unidirectionally coupled lasers. Mutual coupling shows high quality
synchronization in a broad range of self-feedback and coupling strengths. It is
found to be tolerant to significant parameter mismatch which for unidirectional
coupling would result in loss of synchronization. The advantages of mutual
coupling are emphasized in light of its potential use in chaos communications.

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The categories of this paper are: supr-con
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The categories of this paper are: alg-geom
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The categories of this paper are: eess
7
The categories of this paper are: hep-th
5
The categories of this paper are: gr-qc
8
The categories of this paper are: hep-ex
10
The categories of this paper are: q-bio
6
The categories of this paper are: astro-ph
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The categories of this paper are: chem-ph
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The categories of this paper are: bayes-an
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The categories of this paper are: chao-dyn
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The categories of this paper are: plasm-ph
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The categories of this paper are: econ
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The categories of this paper are: hep-lat
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The categories of this paper are: funct-an
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The categories of this paper are: patt-sol