Patent ID: 7217957
Filing Date: 2007-05-15
Classification: G02B,H01L,H01S

Abstract:
1. An optical transmission module comprising: a rectangular substrate; a semiconductor laser directly placed on an upper surface of said substrate to convert an electric signal into an optical signal and to output the optical signal parallel to said upper surface of said substrate, said semiconductor laser including a front end face from which the optical signal is output and a rear end face from which backward light is output; a planar surface optical waveguide on said upper surface of said substrate and adjacent to said front end face of said semiconductor laser to transmit and output the optical signal from said semiconductor laser to the outside of said optical transmission module; an optical fiber having a ferrule and provided at a downstream end of said optical waveguide; a driving device for driving said semiconductor laser, said driving device being placed directly on an upper surface of said optical waveguide; and a monitoring light-receiving device for detecting the backward light emitted from said semiconductor laser, wherein the light receiving device is on said upper surface of said substrate and adjacent to said rear end face of said semiconductor laser.