Optical transmission module

摘要

There is provided a thin and small size connector-less optical transmission module M which assures excellent high frequency characteristic. This optical transmission module comprises transmission line substrates and a coaxial cable for connecting these transmission line substrates and is connected to the transmission line substrate via a contact sleeve which is provided with projections fixed to the external conductor of the coaxial cable and projected in the extending direction of the coaxial cable. Since an electromagnetic field mode alleviating portion formed of a dielectric material is provided to the core wire of the coaxial cable, the thin and small size optical transmission module M can assure less amount of radiation of an interference electromagnetic wave, high frequency characteristic through connection with the coaxial cable.