Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Enhanced sensing with quasi-degenerate mode in fiber Bragg gratings ring
  cavities   In this paper, we report the model and the experimental demonstration of a
new optical resonator formed by inserting a Fiber Bragg Grating (FBG) in a
closed fiber loop. The spectral characteristics of the ring depend on the
reflectivity of the FBG. When the FBG reflectivity tends to zero, the overall
resonant system exhibits the usual degenerate mode conditions. On the other
hand, when the reflection coefficient FBG is not vanishing, the spectral
features of the resonator display split resonant modes associated to the
degeneracy removal of two counterpropagating modes that resonate within the
cavity. The splitting magnitude is maximal in the region of maximum
reflectivity of the FBG. Moreover, it varies by acting on the FBG physical
parameters (e.g. strain, temperature, group index). By considering the spectral
region where the splitting magnitude variation is almost maximal, i.e. quasi
degenerate mode condition, we prove that the device can be used also as a slow
light sensor by monitoring the power change associated with the applied strain
showing, in this case, a sensitivity of 3.6x10^(6)x eps^(-1). To the best of
our knowledge, this represents a factor 20 improvement over the best slow-light
FBG sensors.

8
The categories of this paper are: hep-ex
0
The categories of this paper are: hep-ph
37
The categories of this paper are: supr-con
9
The categories of this paper are: nlin
1
The categories of this paper are: cs
33
The categories of this paper are: plasm-ph
11
The categories of this paper are: hep-lat
30
The categories of this paper are: q-alg
29
The categories of this paper are: funct-an
32
The categories of this paper are: atom-ph
10
The categories of this paper are: q-bio
36
The categories of this paper are: cmp-lg
12
The categories of this paper are: nucl-th
26
The categories of this paper are: bayes-an
16
The categories of this paper are: stat
34
The categories of this paper are: chem-ph