简介：Weproposeajointnonlinearelectricalequalizationapproachincoherentopticaldiscrete-Fourier-transformspreadorthogonal-frequency-division-multiplexing(DFT-spread-OFDM)systemswithpolarizationdivisionmultiplexing(PDM).ThismethodisbasedonanadaptiveVolterraseriesexpansionfornonlineardistortionsoftwoorthogonalpolarizations.Thenonlinearelectricalequalizationisvalidatedthroughnumericalsimulationof100-Gb/squadraturephaseshiftkeyingand200-Gb/s16quadratureamplitudemodulationPDMDFT-spread-OFDMsystems.

简介：ByusingPDM-OFDM-16QAMmodulation,all-Ramanamplification,coherentdetection,and7%forwarderrorcorrection(FEC)threshold,wesuccessfullydemonstrate63-Tb/s(368×183.3-Gb/s)signalover160-kmstandardsinglemodefiber(SSMF)transmissionintheC-andL-bandswith25-GHzchannelspacing.368opticalchannelswithbandwidthspacingof25GHzaregeneratedfrom16externalcavitylasersources.After160-kmSSMFtransmission,alltestedbiterrorrate(BER)areunder3.8×10-3,whichcanberecoveredby7%FECthreshold.Withineachchannel,weachievethespectralefficiencyof6.85bit/s/HzinC/Lband.