Patent ID: 6948865

Claim:
An optical module for inputting and outputting light in a direction of a predetermined axis, comprising: a stem having a principal surface crossing the predetermined axis and a mount disposed on the principal surface, the mount having a first mounting surface extending along a first reference plane which extends in a direction parallel to the predetermined axis crossing the principal surface, a second mounting surface extending along a second reference plane which extends in a direction parallel to the predetermined axis crossing the principal surface, and an optical path defined by a plane laterally extending from the second mounting surface in a direction crossing the predetermined axis, wherein the laterally extending surface defining the optical path is the inner surface of a throughhole extending from the second mounting surface and penetrating through the mount; an optical filter attached to the mount, the optical filter having a first surface and a second surface; a semiconductor light emitting device disposed on the first mounting surface and emitting light of a first wavelength, the semiconductor light emitting device being optically coupled to the first surface of the optical filter; and a semiconductor light receiving device positioned, in alignment with the optical path, on the second mounting surface and being responsive to light of a second wavelength, the semiconductor light receiving device being optically coupled to the second surface of the optical filter through the optical path, thereby receiving the light of the second wavelength from the optical filter.