| 摘要 |
An optical transmission module having optical fibers and an optical semiconductor device with light couplings between the optical fibers and conversion parts of the optical semiconductor device, which conversion parts either convert electrical signals into optical signals or convert optical signals into electrical signals, includes a guide substrate having grooves which hold the optical fibers, and at least one positioning part formed on and protruding from the optical semiconductor device and having a width smaller than that of the grooves, wherein the optical semiconductor device is attached to the guide substrate such that the at least one positioning part fits into the grooves, so that the conversion parts face end surfaces of the optical fibers to establish the light couplings.
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