Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: On the effect of random inhomogeneities in Kerr-media modelled by
  non-linear Schrodinger equation   We consider propagation of optical pulses under the interplay of dispersion
and Kerr non-linearity in optical fibres with impurities distributed at random
uniformly on the fibre. By using a model based on the non-linear Schrodinger
equation we clarify how such inhomogeneities affect different aspects such as
the number of solitons present and the intensity of the signal. We also obtain
the mean distance for the signal to dissipate to a given level.

5
The categories of this paper are: gr-qc
18
The categories of this paper are: econ
30
The categories of this paper are: q-alg
34
The categories of this paper are: chem-ph
29
The categories of this paper are: funct-an
11
The categories of this paper are: hep-lat
33
The categories of this paper are: plasm-ph
22
The categories of this paper are: chao-dyn
28
The categories of this paper are: alg-geom
21
The categories of this paper are: adap-org
35
The categories of this paper are: mtrl-th
15
The categories of this paper are: nucl-ex
27
The categories of this paper are: comp-gas
6
The categories of this paper are: astro-ph
1
The categories of this paper are: cs
8
The categories of this paper are: hep-ex