US 7,321,702 B2
Optical modulator, optical transmitter, optical modulating method and manufacturing method of the optical modulator
Suguru Akiyama, Kawasaki (Japan); and Tsuyoshi Yamamoto, Kawasaki (Japan)
Assigned to Fujitsu Limited, Kawasaki (Japan)
Filed on Jan. 26, 2005, as Appl. No. 11/41,953.
Claims priority of application No. 2004-143575 (JP), filed on May 13, 2004; and application No. 2004-248749 (JP), filed on Aug. 27, 2004.
Prior Publication US 2005/0254743 A1, Nov. 17, 2005
Int. Cl. G02F 1/035 (2006.01)
U.S. Cl. 385—3  [385/1; 385/2] 44 Claims
OG exemplary drawing
 
1. An optical modulator, comprising:
an optical interference unit branching inputted input light into two optical waveguides, and combining respective branched lights propagating through the respective optical waveguides and outputting the combined light;
high-frequency voltage supplier supplying hiah-frequency voltage to at least one optical waveguide out of the two optical waveguides;
a direct-current voltage supplier supplying direct-current voltage to optical waveguides supplied high-frequency voltage by the high-frequency voltage supplier; and
a direct-current voltage controller controlling a value of the direct-current voltage supplied by said direct-current voltage supplier, in accordance with wavelength of the input light.