Patent ID: 8107823

Claim:
An optical transmission module comprising: a communication module for converting an electrical signal to an optical signal or converting an optical signal to an electrical signal; a case for holding the communication module and for positioning an optical plug which includes an optical fiber and a ferrule, and a coupling member for coupling the communication module to the optical plug, wherein the communication module is movably held within the case by the coupling member so that the communications module is spaced from an inner wall of the case and can move within the case without restraint by setting up predetermined distances including a Z direction which is an optical axis direction and X and Y directions which are orthogonal to the Z direction so that the coupling member and the case can move in and out of contact with each other, and wherein said communication module is movable without restraint in X, Y and Z directions and θxy directions which are rotation directions within the case, wherein, when said optical plug is connected to said communication module via the coupling member, the distance in the Z direction becomes zero, and said communication module is positioned by said ferrule of said optical plug, and wherein, when said optical fiber is applied with tensile force and said ferrule is applied with stress, said communication module moves without restraint in the X, Y, Z and θxy directions and follows movement of the ferrule.