Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Formation of ultrashort pulses with sub-Poissonian photon statistics   A simple method for the production of ultrashort light pulses (USPs) with
suppressed photon fluctuations is considered. The method is based on self-phase
modulation (SPM) of an USP in a nonlinear medium (optical fibre) and subsequent
transmission of pulse through a dispersive optical element.

29
The categories of this paper are: funct-an
14
The categories of this paper are: math-ph
15
The categories of this paper are: nucl-ex
19
The categories of this paper are: eess
32
The categories of this paper are: atom-ph
1
The categories of this paper are: cs
25
The categories of this paper are: patt-sol
0
The categories of this paper are: hep-ph
24
The categories of this paper are: dg-ga
10
The categories of this paper are: q-bio
16
The categories of this paper are: stat
37
The categories of this paper are: supr-con
28
The categories of this paper are: alg-geom
3
The categories of this paper are: physics
12
The categories of this paper are: nucl-th
5
The categories of this paper are: gr-qc