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Equalization-enhanced phase noise for coherent-detection systems using electronic digital signal processing.

William Shieh1, Keang-Po Ho

  • 1ARC Special Research Center for Ultra-Broadband Information Networks and National ICT Australia, Department of Electrical and Electronic Engineering, The University of Melbourne, Melbourne, VIC 3010, Australia. w.shieh@ee.unimelb.edu.au

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Summary
This summary is machine-generated.

Electronic compensation of chromatic dispersion in optical systems can worsen laser phase noise. This equalization-enhanced phase noise (EEPN) limits high-speed systems with significant electronic dispersion compensation.

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Area of Science:

  • Optical Communications
  • Digital Signal Processing
  • Photonics Engineering

Background:

  • Coherent optical systems utilize electronic digital signal processing for chromatic dispersion compensation.
  • Electronic compensation offers an alternative to traditional optical dispersion compensators.
  • Electronic equalizers can inadvertently amplify impairments like laser phase noise.

Purpose of the Study:

  • To analyze the impact of electronic dispersion compensation on laser phase noise in coherent optical systems.
  • To investigate the phenomenon of equalization-enhanced phase noise (EEPN).
  • To determine the constraints EEPN imposes on system design parameters.

Main Methods:

  • Simulations and theoretical analysis of coherent optical systems.
  • Modeling the interaction between electronic dispersion compensation and laser phase noise.
  • Evaluating system performance under varying symbol rates and dispersion compensation levels.

Main Results:

  • Electronic dispersion compensation enhances laser phase noise impairments.
  • The phenomenon termed equalization-enhanced phase noise (EEPN) is identified.
  • EEPN introduces stricter requirements for receive laser phase noise in high symbol rate systems with substantial electronic dispersion compensation.

Conclusions:

  • EEPN is a critical factor in designing high-performance coherent optical systems.
  • System designers must account for EEPN when implementing electronic dispersion compensation.
  • Further research is needed to mitigate EEPN for future high-speed optical networks.