Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: All-fiber polarization-manageable directional couplers   Flexible management of light polarization is necessary to develop the
technologies of optical fiber communications. However, it is still a great
challenge to manipulate optical polarization in all-fiberbased devices. Here we
present a novel structural design of three-core fiber couplers to create
arbitrary polarization management by embedding a vector mode segregated core
within the conventional fiber couplers. We take advantages of these coupling
structures to achieve polarization split, rotation, and exchange, as three
essential polarization managements for fiber-guided modes. We study these
couplers based on coupled-mode theory and numerically simulations. The obtained
results show that they manifest favorable operation performance on management
of the fiber modal polarization states. Compared to previous couplers used for
management of power, wavelengths and modal forms, this kind of fiber couplers
introduces a new manageable degree of freedom for modal polarization. It is
expected that the presented all-fiber polarization-manageable directional
couplers might find potential applications in fiber optical communications and
sensing systems.

26
The categories of this paper are: bayes-an
5
The categories of this paper are: gr-qc
0
The categories of this paper are: hep-ph
22
The categories of this paper are: chao-dyn
21
The categories of this paper are: adap-org
27
The categories of this paper are: comp-gas
29
The categories of this paper are: funct-an
25
The categories of this paper are: patt-sol
14
The categories of this paper are: math-ph
4
The categories of this paper are: cond-mat
2
The categories of this paper are: math
10
The categories of this paper are: q-bio
32
The categories of this paper are: atom-ph
18
The categories of this paper are: econ
35
The categories of this paper are: mtrl-th
33
The categories of this paper are: plasm-ph