Patent ID: 6825964
Filing Date: 2004-11-30
Classification: B82Y,G02F

Abstract:
Drive circuitry to provide a DC bias voltage and a high frequency modulation current to an electroabsorption modulator (EAM) which includes a first semiconductor type contact and a second semiconductor type contact, the drive circuitry comprising:a first modulation lead configured to be coupled to the first semiconductor type contact of the EAM; and a second modulation lead configured to be coupled to an AC ground; a coupling capacitor including; an EAM-side capacitor electrode electrically coupled to the second semiconductor type contact of the EAM; a non-EAM-side capacitor electrode electrically coupled to the AC ground; and a dielectric layer disposed between the EAM-side capacitor electrode and the non-EAM-side capacitor electrode; and a first DC lead electrically coupled to the EAM-side capacitor electrode and configured to be coupled to a first DC potential.