Patent ID: 8313251

Claim:
An optical transceiver comprising: an optical sub assembly having a main body part for housing a semiconductor optoelectronic device and a projection which includes an optical coupler for optically coupling an optical fiber, inserted externally into the optical sub assembly projection, to the semiconductor optoelectronic device; a printed circuit board on which a circuit connected to the semiconductor optoelectronic device via a signal transmission line is mounted; a covering member covering the projection of the optical sub assembly; a conductive case housing the optical sub assembly and the printed circuit board, the conductive case having an opening part with an outer periphery and through which opening part the projection, covered by the covering member, passes from inside the case to outside the case; at least an outer circumference surface and an inner circumference surface of the covering member, said circumference surfaces being made of a conductive elastic material having a predetermined resistivity; and at least a part of the outer circumference surface of the covering member intimately contacting at least a part of an outer periphery of the opening part, and at least a part of the inner circumference surface of the covering member intimately contacting the projection.