Patent ID: 7391099

Claim:
An optical modulator module comprising: an optical modulator for modulating light on the basis of an electrical signal; a chip carrier on which the optical modulator is mounted and a first transmission line is formed; a package substrate which is connected to a package and on which a second transmission line is formed; and a high frequency substrate which is arranged between said chip carrier and said package substrate and on which a third transmission line is formed, said third transmission line being connected to both said first transmission line and said second transmission line, wherein each x coordinate each y coordinate of an input terminal of said first transmission line differs from each x coordinate and each y coordinate of an output terminal of said second transmission line; said high frequency substrate in a rectangular shape is arranged so that said high frequency substrate abuts against said chip carrier or said package substrate in the vicinity of one corner of said high frequency substrate while a corner opposite to said one corner is made closer to said chip carrier or said package substrate; and the connection of said first transmission line and said third transmission line or the connection of said second transmission line and said third transmission line is made by wire bonding.