Patent ID: 6594407
Filing Date: 2003-07-15
Classification: G02F,H04B

Abstract:
An optical modulator of clock modulation type comprising:a substrate possessing an electro-optical effect; a first optical waveguide of Mach-Zehnder type formed on the substrate; a second optical waveguide of Mach-Zehnder type formed on the substrate so as to be concatenated with the first optical waveguide of Mach-Zehnder type; a first electrode formed on the substrate for controlling light propagating through the first optical waveguide; a first bias electrode formed on the substrate for supplying a first bias voltage to the first optical waveguide; a second electrode formed on the substrate for controlling light propagating through the second optical waveguide; a second bias electrode formed on the substrate for supplying a second bias voltage to the second optical waveguide; the first optical waveguide, the second optical waveguide, the first electrode, the first bias electrode, the second electrode and the second bias electrode being integrated in the substrate; a clock signal generator which is connected to either the first or second electrode and produces an RZ signal by applying a clock signal to the same; and an NRZ data signal generator which is connected to the remaining electrode and supplies an NRZ data signal to the same.