Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Propagation and asymmetric behavior of optical pulses through
  time-dynamic loss-gain assisted media   We report an asymmetric behavior of optical pulses during their propagation
through a time-varying linear optical medium. The refractive index of the
medium is considered to be varying with time and complex such that a sufficient
amount of gain and loss is present to realize their effect on pulse
propagation. We have exploited the universal formula for optical fields in
time-varying media. Numerically simulated results reveal that pulses undergo
opposite temporal shifts around their initial center position during their
bi-directional propagation through the medium along with corresponding spectral
shifts. Moreover, the peak power and accumulated chirp (time derivative of
accumulated phase) of the output pulse in both propagation directions are also
opposite in nature irrespective of their initial state. Numerically simulated
behavior of the pulses agrees well with the analytical solutions. Possibilities
have been explored in context of pulse shaping and unconventional optical
devices.

27
The categories of this paper are: comp-gas
6
The categories of this paper are: astro-ph
11
The categories of this paper are: hep-lat
36
The categories of this paper are: cmp-lg
17
The categories of this paper are: q-fin
4
The categories of this paper are: cond-mat
2
The categories of this paper are: math
9
The categories of this paper are: nlin
8
The categories of this paper are: hep-ex
18
The categories of this paper are: econ
34
The categories of this paper are: chem-ph
33
The categories of this paper are: plasm-ph
23
The categories of this paper are: solv-int
24
The categories of this paper are: dg-ga
19
The categories of this paper are: eess
20
The categories of this paper are: acc-phys