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  • 1FOTON CNRS ENSSAT, Université de Rennes 1, 6 rue de Kerampont, 22305 Lannion, France.

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Summary

Duobinary line-coding offers significant advantages in optical communication systems, especially with quadratic detection. This analysis defines its fundamental performance limits, showing it approaches theoretical best conditions.

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Area of Science:

  • Optical Communications
  • Information Theory

Background:

  • Duobinary line-coding is an advanced technique for optical communication systems.
  • Understanding its performance limits is crucial for system optimization.

Purpose of the Study:

  • To rigorously define the fundamental performance limits of duobinary line-coding.
  • To compare duobinary systems with traditional intensity modulation.
  • To analyze duobinary performance in realistic optical communication scenarios.

Main Methods:

  • Analysis in Additive White Gaussian Noise (AWGN) channels.
  • Performance evaluation in ASE-noise-limited direct-detection systems.
  • Consideration of noise across all polarizations.
  • Simulations for realistic system setups.

Main Results:

  • Matched filtering is optimal for duobinary and quadratic receivers.
  • Bit error rate in duobinary systems depends on pulse shape and receiver filter.
  • Duobinary line-coding shows intrinsic advantages over uncoded intensity modulation with quadratic detection.

Conclusions:

  • Duobinary line-coding provides superior performance in optical systems, particularly with quadratic detection.
  • The study establishes benchmarks for state-of-the-art system development.
  • Theoretical limits provide a valuable comparison for practical system design.