Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Modal dynamics in multimode optical fibers: An attractor of high-order
  modes   Multimode fibers (MMFs) support abundant spatial modes and involve rich
spatiotemporal dynamics, yielding many promising applications. Here, we
investigate the influences of the number and initial energy of high-order modes
(HOMs) on the energy flow from the intermediate modes (IMs) to the fundamental
mode (FM) and HOMs. It is quite surprising that random distribution of
high-order modes evolves to a stationary one, indicating the asymptotic
behavior of orbits in the same attraction domain. By employing the Lyapunov
exponent, we prove that the threshold of the HOMs-attractor is consistent with
the transition point of the energy flow which indiactes the HOMs-attracotr acts
as a "valve" in the modal energy flow. Our results provide a new perspective to
explore the nonlinear phenomena in MMFs, such as Kerr self-cleaning, and may
pave the way to some potential applications, such as secure communications in
MMFs.

24
The categories of this paper are: dg-ga
22
The categories of this paper are: chao-dyn
10
The categories of this paper are: q-bio
32
The categories of this paper are: atom-ph
9
The categories of this paper are: nlin
15
The categories of this paper are: nucl-ex
27
The categories of this paper are: comp-gas
19
The categories of this paper are: eess
33
The categories of this paper are: plasm-ph
5
The categories of this paper are: gr-qc
37
The categories of this paper are: supr-con
18
The categories of this paper are: econ
12
The categories of this paper are: nucl-th
0
The categories of this paper are: hep-ph
35
The categories of this paper are: mtrl-th
8
The categories of this paper are: hep-ex