Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: 56 GBaud PAM-4 100 km Transmission System with Photonic Processing
  Schemes   Analog photonic computing has been proposed and tested in recent years as an
alternative approach for data recovery in fiber transmission systems. Photonic
reservoir computing, performing nonlinear transformations of the transmitted
signals and exhibiting internal fading memory, has been found advantageous for
this kind of processing. In this work, we show that the effectiveness of the
internal fading memory depends significantly on the properties of the signal to
be processed. Specifically, we demonstrate two experimental photonic
post-processing schemes for a 56 GBaud PAM-4 experimental transmission system,
with 100 km uncompensated standard single-mode fiber and direct detection. We
show that, for transmission systems with significant chromatic dispersion, the
contribution of a photonic reservoir's fading memory to the computational
performance is limited. In a comparison between the data recovery performances
between a reservoir computing and an extreme learning machine fiber-based
configuration, we find that both offer equivalent data recovery. The extreme
learning machine approach eliminates the necessity of external recurrent
connectivity, which simplifies the system and increases the computation speed.
Above 31 dB OSNR, the photonics-based equalization exhibits a lower BER than
the respective offline DSP-based KK receiver.

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The categories of this paper are: hep-ex
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The categories of this paper are: dg-ga
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The categories of this paper are: adap-org
37
The categories of this paper are: supr-con
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The categories of this paper are: q-fin
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The categories of this paper are: solv-int
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The categories of this paper are: hep-ph
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The categories of this paper are: comp-gas
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The categories of this paper are: plasm-ph
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The categories of this paper are: gr-qc
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The categories of this paper are: q-bio
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The categories of this paper are: funct-an
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The categories of this paper are: econ
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The categories of this paper are: cond-mat
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The categories of this paper are: nucl-ex
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The categories of this paper are: quant-ph