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Optica Publishing Group
  • Optical Fiber Communications Conference
  • OSA Trends in Optics and Photonics (Optica Publishing Group, 2002),
  • paper WP2

Third Generation FEC employing Turbo Product Code for Long-Haul DWDM Transmission Systems

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Abstract

Submarine cable systems have expanded in capability in recent years. This progress was made possible by the evolution in the fields of optical amplification, fiber, and Forward Error Correction (FEC). The system margin represented by the FEC coding gain effectively increases the amplifier spacing, the transmission distance or the system capacity.1 Reed-Solomon (RS) coding complying with ITU-T Rec. G.975 has been widely used in previous submarine cable systems as the first generation FEC. The net coding gain is 5.8 dB at a corrected bit error ratio of 1E-13. For the deployment of recent system capacity increases, more powerful FEC schemes have been developed intensively, e.g. the concatenated RS code with iteration.2–4 We call these types of FEC “second generation FEC” having net coding gains of about 7.5 to 8.2 dB. In order to realize capacity beyond 1 Tb/s, there is no doubt that much further improvement in FEC gain will become necessary.

© 2002 Optical Society of America

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