Patent ID: 8373992

Claim:
A transmission/reception optical module, comprising: an optical transmission subassembly including a light-emitting element and a monitor light-receiving element for monitoring an optical output of the light-emitting element; an optical reception subassembly including a light-receiving element and a preamplifying element for amplifying an output of the light-receiving element; and a circuit board for controlling the optical transmission subassembly and the optical reception subassembly; the circuit board being formed into one member by a rigid-flexible substrate comprising rigid regions and flexible regions wherein a circuit board main body, an optical transmission subassembly fixation region, and an optical reception subassembly fixation region are comprised of the rigid regions; while the circuit board main body is connected to the optical transmission subassembly fixation region, and the optical reception subassembly fixation region by the flexible regions, and a part of the circuit board main body is comprised of a flexible region; wherein a driver for driving the optical transmission subassembly, and a waveform-shaping IC for transmission purposes for shaping a waveform of an electrical signal input to the optical transmission subassembly are mounted on the optical transmission subassembly fixation region, and wherein a control circuit for controlling the optical transmission subassembly and the optical reception subassembly, and a waveform-shaping IC for reception purposes for shaping a waveform of an electrical signal output from the optical reception subassembly are mounted on the circuit board main body.