Modeling and optimization of a single-drive push–pull silicon Mach–Zehnder modulator

(整期优先)网络出版时间:2016-04-14
/ 1
Wepresentanequivalentcircuitmodelforasiliconcarrier-depletionsingle-drivepush–pullMach–Zehndermodulator(MZM)withitstravelingwaveelectrodemadeofcoplanarstriplines.Inparticular,thepartialcapacitancetechniqueandconformalmappingareusedtoderivethecapacitanceassociatedwitheachlayer.ThePNjunctionisaccuratelymodeledwiththefringecapacitancestakenintoconsideration.Thecircuitmodelisvalidatedbycomparingthecalculationswiththesimulationresults.Usingthismodel,weanalyzetheeffectofseveralkeyparametersonthemodulatorperformancetooptimizethedesign.ExperimentalresultsofMZMsconfirmthetheoreticalanalysis.A56Gb/son–offkeyingmodulationanda40Gb/sbinaryphase-shiftkeyingmodulationareachievedusingtheoptimizedmodulator.