Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Computational studies of light acceptance and propagation in straight
  and curved optical fibres   A Monte Carlo simulation has been performed to track light rays in
cylindrical fibres by ray optics. The trapping efficiencies for skew and
meridional rays in active fibres and distributions of characteristic quantities
for all trapped light rays have been calculated. The simulation provides new
results for curved fibres, where the analytical expressions are too complex to
be solved. The light losses due to sharp bending of fibres are presented as a
function of the ratio of curvature to fibre radius and bending angle. It is
shown that a radius of curvature to fibre radius ratio of greater than 65
results in a loss of less than 10% with the loss occuring in the initial stage
of the bend (at bending angles Phi circa pi/8 rad).

22
The categories of this paper are: chao-dyn
15
The categories of this paper are: nucl-ex
1
The categories of this paper are: cs
10
The categories of this paper are: q-bio
6
The categories of this paper are: astro-ph
37
The categories of this paper are: supr-con
29
The categories of this paper are: funct-an
5
The categories of this paper are: gr-qc
7
The categories of this paper are: hep-th
23
The categories of this paper are: solv-int
34
The categories of this paper are: chem-ph
27
The categories of this paper are: comp-gas
14
The categories of this paper are: math-ph
2
The categories of this paper are: math
17
The categories of this paper are: q-fin
35
The categories of this paper are: mtrl-th