简介：Anovel1.55-μmspot-sizeconverterintegratedelectroabsorptionmodulatorwasdesignedwithconventionalphotolithographyandchemicalwetetchingprocess.Aridgedouble-corestructurewasemployedforthemodulator,andaburiedridgedouble-corestructurewasincorporatedforthespot-sizeconverter.Thepassivewaveguidewasopticallycombinedwithalaterallytaperedactivewaveguidetocontrolthemodesize.Thefigureofmeritis4.1667dB/V(/100μm)andthebeamdivergenceanglesinthehorizontalandverticaldirectionswereassmallas11.2°and13.0°,respectively.

简介：Non-uniformstep-sizedistributionisimplementedforsplit-stepbasednonlinearcompensationinsingle-channel112-Gb/s16quadratureamplitudemodulation(QAM)transmission.Numericalsimulationsofthesystemincludinga20×80kmuncompensatedlinkareperformedusinglogarithmicstepsizedistributiontocompensatesignaldistortions.50%ofreductioninnumberofstepswithrespecttousingconstantstepsizesisobserved.Theperformanceisfurtherimprovedbyoptimizingnonlinearcalculatingposition(NLCP)incaseofusingconstantstepsizeswhileNLCPoptimizationbecomesunnecessarywhenusinglogarithmicstepsizes,whichreducesthecomputationaleffortduetouniformlydistributednonlinearphaseforallsuccessivesteps.