Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: SU(N) Representation of Mode Dispersion in a Multimode Optical Fiber:
  Determining Principal Modes for Mode Division Multiplexing   A method is proposed to experimentally determine principal modes for mode
division multiplexing in a multimode optical fiber, i.e., increasing optical
fiber information capacity via higher-order transverse eigenmodes. Principal
modes are a special linear combination of eigenmodes that do not exhibit mode
dispersion up to first order in frequency. This method is based on an SU(N)
representation of mode dispersion whereby the generators of the corresponding
SU(N) Lie algebra, i.e., generalized Gell-Mann matrices, predict higher-order
Stokes parameters which can be used to measure principal modes at the optical
fiber input and output. Applications of the SU(N) representation to decoherence
free subspaces for single photon entanglement in higher-dimensional Hilbert
spaces is discussed.

12
The categories of this paper are: nucl-th
2
The categories of this paper are: math
37
The categories of this paper are: supr-con
22
The categories of this paper are: chao-dyn
30
The categories of this paper are: q-alg
35
The categories of this paper are: mtrl-th
17
The categories of this paper are: q-fin
20
The categories of this paper are: acc-phys
31
The categories of this paper are: ao-sci
21
The categories of this paper are: adap-org
6
The categories of this paper are: astro-ph
23
The categories of this paper are: solv-int
0
The categories of this paper are: hep-ph
15
The categories of this paper are: nucl-ex
25
The categories of this paper are: patt-sol
24
The categories of this paper are: dg-ga