Patent ID: 8303195

Claim:
An optical transceiver module having one laser diode and one or more photodetectors that use different operating wavelengths and are optically connected to the optical axis of an externally installed optical fiber, the optical transceiver module comprising: an optical device mounting substrate on which the laser diode and the photodetectors are mounted in the same direction; a first lens which is positioned near the laser diode or monolithically integrated with the laser diode; an optical multiplexer/demultiplexer which includes at least one type of a wavelength-selective filter, and a mirror that opposes the wavelength-selective filter and is positioned at a predetermined distance therefrom; a package which houses the optical device mounting substrate and the optical multiplexer/demultiplexer by fastening the optical device mounting substrate and the optical multiplexer/demultiplexer to desired places; and a second lens which converges light coming out of the optical multiplexer/demultiplexer toward the optical fiber; wherein the second lens has a larger diameter than the first lens; wherein the optical multiplexer/demultiplexer is positioned at a predetermined angle from the optical axis of the optical fiber and fastened to the package; wherein light emitted from the optical fiber is converged toward one of the photodetectors by the second lens; wherein the light emitted from the optical fiber or the laser diode is incident on a surface of the wavelength-selective filter at a non-perpendicular angle, and subjected to multiple reflection between the wavelength-selective filter and the mirror in such a manner that light having one wavelength and light having another wavelength are separated from each other or superposed one over the other for multiplexing or demultiplexing purposes; and wherein the laser diode is positioned closer to the second lens than to a focal position at which the light emitted from the optical fiber is imaged by the second lens.