Patent ID: 7486846

Claim:
An optical transmitting and receiving module comprising: a light transmitting substrate for transmitting light of a first wavelength, the light transmitting substrate having first and second main surfaces opposed to each other through the light transmitting substrate; a laser diode, arranged in the first surface of the light transmitting substrate, for emitting light of a second wavelength that differs from the first wavelength; a photodiode, mounted on the second surface of the light transmitting substrate surface; a dielectric film filter for reflecting light of the first wavelength and transmitting light of the second wavelength; a first lens for guiding the light emitted from the laser diode to the dielectric film filter, the first lens set in a groove formed in the first main surface of the light transmitting substrate and between the laser diode and the dielectric film filter; an optical input/output portion for inputting light emitted from the laser diode and for outputting light to the photodiode; a second lens for guiding the light passing through the dielectric film filter and having the second wavelength to the optical input/output portion, the second lens being set in a groove formed in the first main surface of the light transmitting surface; and a converging lens formed on the first main surface of the light transmitting substrate for guiding light reflected from the dielectric film filter to a photodiode; the dielectric film filter being set in an inclined groove, formed on the first surface of the light transmitting substrate with a predetermined inclination angle in the light transmitting substrate, so as to match optical paths between the photodiode and the optical input/output portion and match optical paths between the laser diode and the optical input/output portion.