简介:Weproposeanovelsiliconopticalphaseshifterstructurebasedonheterogeneousstrip-loadedwaveguidesonaphotonicsilicononinsulator(SOI)platform.ThefeaturesofanetchlessSOIlayerandloadedstripwouldenhancetheperformanceanduniformityofsiliconopticalmodulatorsonalarge-scalewafer.WeimplementedthephaseshifterbyloadinganamorphoussiliconstripontoanSOIlayerwithaverticalPNdiodestructure.ComparedtotheconventionallateralPNphaseshifterbasedonhalf-etchedribwaveguides,thisphaseshiftershowsa>1.5timesenhancementofmodulationefficiencyandprovides>20GHzhigh-speedoperation.