简介：ThisarticleinvestigatestransmitterdesigninRayleighfadingmultipleinputmultipleoutput(MIMO)channelswithspatialcorrelationwhentherearechanneluncertaintiescausedbyacombinedeffectofchannelestimationerrorandlimitedfeedback.Toovercomethehighcomputationalcomplexityoftheoptimaltransmitpowerallocation,asimpleandsuboptimalallocationisproposedbyexploitingthetransmissionconstraintanddifferentiatingaboundbasedonJenseninequalityonthechannelcapacity.Thesimulationresultsshowthatthemutualinformationcorrespondingtotheproposedpowerallocationcloselyapproachesthechannelcapacitycorrespondingtotheoptimaloneandmeanwhilethecomputationalcomplexityisgreatlyreduced.

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简介：A100-Gb/shigh-speedopticaltransmitterisproposedandexperimentallydemonstrated.Basedonfrequency-quadruplingtechnique,twosub-channelswithafixed50-GHzspacingareobtainedfromonelasersource.Usingreturn-to-zerodifferentialquadraturephase-shiftkeying(RZ-DQPSK)modulationformatandpolarizationmultiplexing(PolMux),onlylow-speedelectronicdevicesof12.5GHzareneededforthe100-Gb/stransmitter.Thiseliminatestheneedofultrahigh-speedoptoelectronicdevicesandthusgreatlyreducesthecost.Theexperimentalresultsshowthatthistransmittercanachievegoodperfor-manceindispersiontoleranceofa25-kmsinglemodefiber(SMF).