Sumitomo Electric Industries, Limited

Takayoshi Inujima

Eiji Tsumura

Hiromi Kurashima

Kazushige Oki

An optical link module comprises a transmitting optical sub-assembly (TOSA), a receiving optical subassembly (ROSA), a board and electronic parts. The electronic parts are necessary for wire-bonding to connect electronic thereto and mounted only on either the first surface or the second surface of the board.

Optical link module

A wiring pattern of a circuit board comprises two reference voltage lines holding a signal line therebetween, whereas the reference voltage lines on both ends are electrically connected to a conductive bracket. The bracket covers and electrically shields lead pins connecting a light-receiving device unit or light-emitting device unit to the circuit board.

Optical module

A light-emitting device assembly in the transmission optical module in accordance with the present invention accommodates a light-emitting device in a case, whereas a connection pin electrically connected to the anode of the light-emitting device extends outward from the case. The module also has a circuit board on which an electronic device for controlling the light-emitting device is mounted, whereas the circuit board is mounted in a board mounting part of a lead frame. The circuit board is provided with a first pad to which a predetermined potential is applied, and a second pad for supplying a source voltage, whereas wires bonding the connection pin to the first and second pads respectively.

Transmission optical module

A light-receiving device unit (as with a light-emitting device unit) has a body accommodated in a cylindrical hole in a housing, and a flange part secured by being pressed toward an end face of the housing by a protrusion of a bracket holder. The bracket holder comprises a tilted wall corresponding to an inclined wall of the housing, and reliably presses the light-receiving device unit while being slid along a slope when being inserted. Also, it engages an abutment of the housing by using a claw at the leading end of the protrusion.

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Yokohama, Japan

Takayoshi Inujima