Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Physics-oriented learning of nonlinear Schr\"odinger equation: optical
  fiber loss and dispersion profile identification   In optical fiber communication, system identification (SI) for the nonlinear
Schr\"odinger equation (NLSE) has long been studied mainly for fiber
nonlinearity compensation (NLC). One recent line of inquiry to combine a
behavioral-model approach like digital backpropagation (DBP) and a data-driven
approach like neural network (NN). These works are aimed for more NLC gain;
however, by directing our attention to the learned parameters in such a SI
process, system status information, i.e., optical fiber parameters, will
possibly be extracted. Here, we show that the model-based optimization and
interpretable nature of the learned parameters in NN-based DBP enable
transmission line monitoring, fully extracting the actual in-line NLSE
parameter distributions. Specifically, we demonstrate that longitudinal loss
and dispersion profiles along a multi-span link can be obtained at once,
directly from data-carrying signals without any dedicated analog devices such
as optical time-domain reflectometry. We apply the method to a long-haul
(~2,080 km) link and various link conditions are tested, including excess loss
inserted, different fiber input power, and non-uniform level diagram. The
measurement performance is also investigated in terms of measurement range,
accuracy, and fiber launch power. These results provide a path toward
simplified and automated network management as another application of DBP.

1
The categories of this paper are: cs
0
The categories of this paper are: hep-ph
27
The categories of this paper are: comp-gas
8
The categories of this paper are: hep-ex
2
The categories of this paper are: math
7
The categories of this paper are: hep-th
33
The categories of this paper are: plasm-ph
5
The categories of this paper are: gr-qc
24
The categories of this paper are: dg-ga
36
The categories of this paper are: cmp-lg
35
The categories of this paper are: mtrl-th
30
The categories of this paper are: q-alg
22
The categories of this paper are: chao-dyn
20
The categories of this paper are: acc-phys
16
The categories of this paper are: stat
12
The categories of this paper are: nucl-th