Patent ID: 7426225

Claim:
The optical transmitting assembly comprising: a semiconductor light-emitting device for emitting light by receiving a modulation signal; a thermoelectric cooler for controlling a temperature of said semiconductor light-emitting device by receiving a control signal; a box-shaped package for housing said semiconductor light-emitting device and said thermoelectric cooler, said package having a bottom providing a terrace and first to fourth side walls arranged on said bottom, said third wall including a first lead pin for supplying said modulation signal, said second side wall including a second lead pin for supplying said control signal; and an optical coupling portion attached to said first side wall, wherein said optical coupling portion, said semiconductor light-emitting device and said first lead pin are arranged in a line along a predetermined axis and said second lead pin extends to a direction intersecting said predetermined axis, and wherein said second and third side walls include a first multi-layered ceramic substrate arranged on said bottom and a second multi-layered ceramic substrate arranged on said first multi-layered ceramic substrate, said first and second multi-layered ceramic substrates providing an opening through which said thermoelectric cooler is inserted.