Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Polarization control for slow and fast light in fiber optical,
  Raman-assisted, parametric amplification   Efficient slow and fast light fiber devices based on narrow band optical
parametric amplification require a strict polarization control of the waves
involved in the interaction. The use of high birefringence and spun fibers is
studied theoretically, possible impairments evaluated, and design parameters
determined.

7
The categories of this paper are: hep-th
27
The categories of this paper are: comp-gas
30
The categories of this paper are: q-alg
20
The categories of this paper are: acc-phys
2
The categories of this paper are: math
36
The categories of this paper are: cmp-lg
0
The categories of this paper are: hep-ph
26
The categories of this paper are: bayes-an
22
The categories of this paper are: chao-dyn
21
The categories of this paper are: adap-org
17
The categories of this paper are: q-fin
13
The categories of this paper are: quant-ph
18
The categories of this paper are: econ
15
The categories of this paper are: nucl-ex
23
The categories of this paper are: solv-int
35
The categories of this paper are: mtrl-th