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Quasi-light Storage for Optical Data Packets
07:45

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Coherent optical communication: towards realtime systems at 40 Gbit/s and beyond.

T Pfau1, S Hoffmann, O Adamczyk

  • 1University of Paderborn, EIM-E, Warburger Str. 100, D-33098 Paderborn, Germany.

Optics Express
|June 11, 2008
PubMed
Summary

Real-time coherent optical communication systems achieve superior performance. A novel Quadrature Phase-Shift Keying system demonstrated a low Bit Error Rate (BER) below the Forward Error Correction (FEC) threshold at 1.4 Gbit/s.

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Area of Science:

  • Optical Communications
  • Digital Signal Processing
  • Telecommunications Engineering

Background:

  • Coherent optical communication systems offer enhanced performance but face real-time implementation challenges.
  • Offline experiments have demonstrated the significant potential of these advanced transmission systems.
  • Key technological components are crucial for enabling real-time coherent optical communication.

Purpose of the Study:

  • To review recent advancements in real-time coherent communication technologies.
  • To present the design and performance of a real-time Quadrature Phase-Shift Keying (QPSK) transmission system.
  • To evaluate the system's Bit Error Rate (BER) against the Forward Error Correction (FEC) threshold.

Main Methods:

  • Implementation of a real-time coherent optical transmission system.
  • Integration of a 3x3 coupler within the receiver architecture.
  • Testing the system at a data rate of 1.4 Gbit/s.

Main Results:

  • Successful real-time operation of a coherent QPSK transmission system.
  • Achieved a Bit Error Rate (BER) significantly below the FEC threshold.
  • Demonstrated the viability of the implemented receiver components for high-speed communication.

Conclusions:

  • The developed real-time coherent QPSK system meets the stringent requirements for advanced optical networks.
  • The use of a 3x3 coupler in the receiver is effective for achieving low BER.
  • This work paves the way for practical, high-performance real-time coherent optical communication systems.