Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: High-order coherent communications using mode-locked dark-pulse Kerr
  combs from microresonators   Microresonator frequency combs harness the nonlinear Kerr effect in an
integrated optical cavity to generate a multitude of phase-locked frequency
lines. The line spacing can reach values in the order of 100 GHz, making it an
attractive multi-wavelength light source for applications in fiber-optic
communications. Depending on the dispersion of the microresonator, different
physical dynamics have been observed. A recently discovered comb state
corresponds to the formation of mode-locked dark pulses in a normal-dispersion
microcavity. Such dark-pulse combs are particularly compelling for advanced
coherent communications since they display unusually high power conversion
efficiency. Here, we report the first coherent transmission experiments using
64-quadrature amplitude modulation encoded onto the frequency lines of a
dark-pulse comb. The high conversion efficiency of the comb enables transmitted
optical signal-to-noise ratios above 33 dB while maintaining a laser pump power
level compatible with state-of-the-art hybrid silicon lasers.

18
The categories of this paper are: econ
23
The categories of this paper are: solv-int
31
The categories of this paper are: ao-sci
9
The categories of this paper are: nlin
13
The categories of this paper are: quant-ph
37
The categories of this paper are: supr-con
36
The categories of this paper are: cmp-lg
2
The categories of this paper are: math
29
The categories of this paper are: funct-an
8
The categories of this paper are: hep-ex
1
The categories of this paper are: cs
33
The categories of this paper are: plasm-ph
19
The categories of this paper are: eess
32
The categories of this paper are: atom-ph
30
The categories of this paper are: q-alg
26
The categories of this paper are: bayes-an