Patent ID: 7136595

Claim:
An optical transmitter-receiver, comprising: an optical transmitter, said optical transmitter comprising: a semiconductor laser light source; and a traveling-wave optical modulator for modulating output light of the semiconductor laser light source, wherein: said traveling-wave optical modulator comprises an external semiconductor modulator disposed on a first substrate, said external semiconductor modulator being capable of modulating output light of the semiconductor laser light source, the external semiconductor modulator comprising an optical interference waveguide and a plurality of separated electrodes being disposed on an optical interference waveguide cyclically, a high-frequency line disposed on a second substrate separated from the first substrate, a plurality of separated electrodes being disposed cyclically on a part of the high-frequency line corresponding to the external semiconductor modulator, the first substrate being fixedly secured to the second substrate with an active layer side of the external semiconductor modulator disposed on the first substrate and a high-frequency line side of the second substrate facing each other so that each separated electrode disposed on the optical interference waveguide is fixedly secured on the high-frequency line through the corresponding separated electrodes disposed on the high-frequency line each other, and in said traveling-wave optical modulator, a control electrode for the external semiconductor modulator, which is included in the external semiconductor modulator, is electrically connected to the high-frequency line; and an optical receiver, said optical receiver comprising: a light receiving element disposed on a third substrate; a high-frequency line disposed on a fourth substrate separated from the third substrate; a traveling-wave optical modulator in which an electrode used for detecting an electric output of the light receiving element is electrically connected to the high-frequency line; a plurality of separated electrodes being disposed cyclically on a part of the high-frequency line corresponding to the traveling-wave optical modulator, the traveling-wave optical modulator comprising an optical interference waveguide; and a plurality of separated electrodes being disposed on the optical interference waveguide cyclically, said electrode being included in the light receiving element, wherein the third substrate is fixedly secured to the fourth substrate with an active layer side of the light receiving element disposed on the third substrate and a high-frequency line side of the fourth substrate facing each other so that each of the separated electrode disposed on the optical interference waveguide is fixedly secured on the high-frequency line through the corresponding separated electrodes disposed on the high-frequency line each other.