Patent ID: 6975812

Claim:
An optical communication device for reflecting detection light of a wavelength to a central station in order to find disorders in a light guide, comprising: a substrate; at least one optical fiber for guiding the detection light and for guiding signal light of a wavelength different from the detection light; at least one ferrule for holding a part of the optical fiber near an end of the fiber; at least one optoelectronic device chip mounted upon the substrate and facing the end of the optical fiber for producing transmitting signal light for the central station or for receiving signals from the central station via the optical fiber; and a detection light reflecting grating located on a part of the optical fiber outside of the ferrule and between the ferrule and the optoelectronic device the grating allowing the signal light to penetrate therethrough but reflecting the detection light emitted from the central station to direct the detection light back via the same optical fiber to the central station so that the central station detects the occurrence of disorders in the optical fiber between the central station and the optical communication device by receiving or not receiving the detection light.