Patent ID: 7429725

Claim:
An optical assembly comprising: a light-emitting device for emitting light with a first wavelength along a first direction; a light-receiving device having a light-sensitive area and an optical thin film configured to reflect the light emitted from the light-emitting device to a second direction substantially in perpendicular to the first direction and to transmit light with a second wavelength coming from the second direction to the light-sensitive area; a bench with an area where the light-receiving device is mounted thereon; a stem with a primary surface where the bench is installed thereon, the area of the bench being inclined to the primary surface of the stem such that the second direction is substantially in perpendicular to the primary surface of the stem; a pre-amplifier for amplifying a signal generated in the light-receiving device; a bonding wire for supplying a driving current to the light-emitting device; and an interconnection for connecting the light-receiving device with the pre-amplifier, wherein the bonding wire and the interconnection extend along directions substantially in perpendicular to each other.