| 摘要 |
PROBLEM TO BE SOLVED: To provide a small-sized optical semiconductor device which can maintain the wavelength of an optical signal emitted from an optical semiconductor element constant. SOLUTION: An optical semiconductor device has an optical semiconductor element 4 laid at the bottom surface of inside of a vessel 1 via an electron-cooling element 2; and a wiring substrate 9, one end part of which is laid on a holding member that is located at one part of the inside or inside of the vessel 1, the other end part of which is laid near the optical semiconductor element 4 of the upper surface of the electron-cooling element 2, and where a wiring conductor 9b is formed to transmit a driving signal input into the optical semiconductor element 4. The wiring substrate 9 has the wiring conductor 9b on the upper surface of an insulating substrate 9a and a grounding conductor layer 9c comprising of an underlying conductor layer formed at nearly all the surface of the lower surface, and a main conductor layer which is formed at one end part and at a region of other end part of the underlying conductor layer. COPYRIGHT: (C)2004,JPO
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