Forward Error Correction (FEC) techniques for …

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1Bell LaboratoriesForward Error Correction (FEC) techniques for optical communicationsIEEE High-Speed Study Group Plenary meeting, MontrealJuly 1999Kamran Azadet, Mark YuLucent TechnologiesPhone: 732-949-7280Email: LaboratoriesOutlineqWhy FEC ?qCyclic codes - OverviewqAlgorithms and implementationqEncoderqDecoderqPerforman ce analysisqLatency issuesqSummary3Bell LaboratoriesWhy FEC ?4Bell LaboratoriesWhy FEC ?qFEC lowers BER by a great deal for low for RS(255,239) overhead is 6%: For input BER=10-4, outputBER=10-14 !qVery low overhead codes exist (less than ) and have beenwidely used in other optical communication applicationsqPossible trade-off between performance and overhead (illustrated in thistalk)qOverheadqincreased rate -> slightly reduces the overall coding gainqelectronics cost (MUX/DEMUX if line rate is increased)qadds FEC circuitry (encoder is simpler than decoder)5Bell LaboratoriesHow to incorporate FEC in 10GbE ?

5 Bell Laboratories How to incorporate FEC in 10GbE ? qWAN applications incorporate already FEC, solutions are currently proprietary. There is however an on-going effort to

  Technique, Correction, Forward, Errors, Forward error correction, Techniques for