Abstract:
Visiblelightcommunication(VLC)technologyutilizesvisiblelightforhigh-speedwire- less communication facilitating a secure and energy-efficient data transmission. This study focusesonthedesignandperformanceanalysisofnitrideMultipleQuantumWell(MQW)- based Electro-Absorption Modulators (EAMs) for visible light communication (VLC) sys- tems. Nitride semiconductors offer unique advantages, such as wide bandgap and high carriermobility,makingthemsuitableforVLCapplications.TheproposedEAMdesignin- corporatesMQWstoharnessthequantum-confinedStarkeffect(QCSE)forefficientmod- ulation of visible light signals. Based on the envelope function approximation,incident lightenergy,andE-fielddependentabsorptioncharacteristicsareevaluatedusingtheself- consistent numerical method. A substantial modulation bandwidth of approximately75 THzisachieved.Thestudyfindingssuggestthatthehighestlevelofperformancecanbe achievedbyadjustingtheelectricfieldfrom250V/µmto340V/µm,whichcorrespondsto thethe’ON’and’OFF’statesatawavelengthof450nm.Theverificationoftheexistence ofconfinedmodeisconducted,andanexaminationofthecharacteristicsofthefundamental modeisperformedusingFiniteElementMethod(FEM)-basedmodalanalysis.Thestudy revealedthatconfinedpowerpercentagevariesfrom3.13%forasingleQWto62.4%for aQWcountof30.Implementingthemodulatorasamulti-statefrequency-dependents- parameter component, the modulation characteristics are observed. Quantitative analysisof themodulatedsignaldistortionwasperformedbasedonthecommonlyemployedFigureof aMerit(FoM),ExtinctionRatio(ER)andQualityFactor(Q-factor).ThenormalizedPower amplitudeofONandOFFstateswasobservedas≈89%and5%exhibitingERof20and Q−factorof484.TheproposedEAMdesignpresentsapotentialsolutionforachieving efficientmodulationofvisiblelightsignals.Foraspecificfreespacelossychannel,the maximumerror-freetransmissibledistancesare2.31m,4.123m,and4.8882mforinput powers of 1 W, 5 W, and 10 W for transmission. With the input power level of 1W, the error-freetransmissiondistanceobtainedare1.945mand2.345m,respectivelyfor10Gbps and 5 Gbps data speed. We conducted an investigation to confirm the inherenttrade-off betweenthedemandforinputPowerandtheachievementofhigh-speedcommunication. Ourfindingsindicatethata30Gbpsincreaseinspeedcanbeachievedattheexpenseof a1000mWpowerenhancement.Thesefindingswillpavethewayfortherealizationof high-performance nitride quantum well-based EAMs, enabling the deployment of efficient and reliable VLC systems for variousapplications.