Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Generation of ultra broadband coherent supercontinuum in tapered and
  dispersion managed silicon nanophotonic waveguides   Tapered and dispersion managed (DM) silicon nanophotonic waveguides are
investigated for the generation of optimal ultra broadband supercontinuum (SC).
DM waveguides are structures showing a longitudinally dependent group velocity
dispersion that results from the variation of the waveguide width with the
propagation distance. For the generation of optimal SC, a genetic algorithm has
been used to find the best dispersion map. This allows for the generation of
highly coherent supercontinuums that span over 1.14 octaves from 1300 nm to
2860 nm and 1.25 octaves from 1200 nm to 2870 nm at -20 dB level for the
tapered and DM waveguides respectively, for a 2 $\mu$m, 200 fs and 6.4 pJ input
pulse. The comparison of these two structures with the usually considered
optimal fixed width waveguide shows that the SC is broader and flatter in the
more elaborated DM waveguide, while the high coherence is ensured by the
varying dispersion.

33
The categories of this paper are: plasm-ph
4
The categories of this paper are: cond-mat
20
The categories of this paper are: acc-phys
31
The categories of this paper are: ao-sci
26
The categories of this paper are: bayes-an
15
The categories of this paper are: nucl-ex
23
The categories of this paper are: solv-int
14
The categories of this paper are: math-ph
21
The categories of this paper are: adap-org
29
The categories of this paper are: funct-an
24
The categories of this paper are: dg-ga
19
The categories of this paper are: eess
36
The categories of this paper are: cmp-lg
11
The categories of this paper are: hep-lat
35
The categories of this paper are: mtrl-th
30
The categories of this paper are: q-alg