Optical module, manufacturing method thereof, and optical transmitter

Abstract

An optical module including a first optical coupler; a second optical coupler; a first optical waveguide; a second optical waveguide; a first electrode provided on the first optical waveguide; a second electrode provided on the second optical waveguide; a short electrode shorter than the first and second electrodes and provided on the second optical waveguide; and a first high-frequency connector and a second high-frequency connector; wherein, the short electrode provided on the second optical waveguide is coupled to the second high-frequency connector; and the first electrode provided on the first optical waveguide is coupled to the first high-frequency connector.

What is claimed is: 
     
         1 . An optical transmitter comprising:
 a first optical coupler including at least one input port, and a first output port and a second output port;   a second optical coupler including a first input port and a second input port, and at least one output port;   a first optical waveguide, one end of which is coupled to the first output port and the other end of which is coupled to the first input port;   a second optical waveguide, one end of which is coupled to the second output port and the other end of which is coupled to the second input port;   a first electrode provided on the first optical waveguide;   a second electrode provided on the second optical waveguide;   a short electrode shorter than the first and second electrodes and provided on the second optical waveguide;   a high-frequency power supply that is coupled to the short electrode provided on the second optical waveguide, and to the first electrode provided on the first optical waveguide.   
     
     
         2 . The optical transmitter according to  claim 1 , further comprising:
 a DC power supply coupled to the second electrode provided on the second optical waveguide.   
     
     
         3 . The optical transmitter according to  claim 1 , further comprising; another short electrode provided on the first optical waveguide. 
     
     
         4 . The optical transmitter according to  claim 1 , further comprising:
 a package including a first high-frequency connector and a second high-frequency connector, wherein   the short electrode provided on the second optical waveguide is coupled to the high-frequency power supply via the second high-frequency connector, and   the electrode provided on the first optical waveguide is coupled to the high-frequency power supply via the first high-frequency connector.   
     
     
         5 . The optical transmitter according to  claim 4 , further comprising:
 a carrier including a wiring in the package, wherein the short electrode provided on the second optical waveguide is coupled to the high-frequency power supply via the wiring formed over the carrier and the second high-frequency connector;   the first electrode provided on the first optical waveguide is coupled to the high-frequency power supply via the wiring formed over the carrier and the first high-frequency connector.   
     
     
         6 . The optical transmitter according to  claim 1 , further comprising:
 a semiconductor laser.   
     
     
         7 . A method for manufacturing an optical module comprising:
 disposing a Mach-Zehnder (MZ) type modulation device in a package that includes a first high-frequency connector and a second high-frequency connector, the Mach-Zehnder (MZ) type modulation device including:   a first optical coupler including at least one input port, and a first output port and a second output port;   a second optical coupler including a first input port and a second input port, and at least one output port;   a first optical waveguide, one end of which is coupled to the first output port and the other end of which is coupled to the first input port;   a second optical waveguide, one end of which is coupled to the second output port and the other end of which is coupled to the second input port;   a first electrode provided on the first optical waveguide;   a second electrode provided on the second optical waveguide; and   a short electrode shorter than the first and second electrodes and provided on the second optical waveguide; and   coupling the short electrode provided on the second optical waveguide to the second high-frequency connector; and   coupling the electrode provided on the first optical waveguide to the first high-frequency connector.   
     
     
         8 . The method for manufacturing an optical module according to  claim 7 , comprising:
 coupling the electrode provided on the second optical waveguide to a DC connector.   
     
     
         9 . The method for manufacturing an optical module according to  claim 8 , wherein another short electrode is provided on the first optical waveguide. 
     
     
         10 . The method for manufacturing an optical module according to  claim 9 , further comprising:
 coupling the short electrode provided on the first optical waveguide to the another DC connector.   
     
     
         11 . A method for manufacturing an optical module comprising:
 disposing a Mach-Zehnder (MZ) type modulation device in a package that includes a first high-frequency connector and a second high-frequency connector, the Mach-Zehnder (MZ) type modulation device including   a first optical coupler including at least one input port, and a first output port and a second output port;   a second optical coupler including at least a first input port and a second input port, and at least one output port;   a first optical waveguide, one end of which is coupled to the first output port and the other end of which is coupled to the first input port;   a second optical waveguide, one end of which is coupled to the second output port and the other end of which is coupled to the second input port;   a first electrode provided on the first optical waveguide;   a second electrode provided on the second optical waveguide; and   a short electrode shorter than the first and second electrodes and provided on the second optical waveguide;   coupling the first electrode provided on the first waveguide to the first high-frequency connector and the second electrode provided on the second waveguide to the second high-frequency connector when an optical module for zero-chirp operation is manufactured; and   coupling the short electrode provided on the second optical waveguide to the second high-frequency connector, and   coupling the first electrode provided on the first optical waveguide to the first high-frequency connector when an optical module for positive chirp operation or negative chirp operation is manufactured.