PURPOSE: To enable the separate monitoring of respective input light by using only the very small part of input light by branching the input light consisting of a principal component and an auxiliary component differing in polarization with a polarization filter and conducting the principal component light to a light output end and the auxiliary component light to a terminal for monitoring the light output.
CONSTITUTION: Semiconductor lasers 11, 12 consist of a 95% principal polarization component and auxiliary light wherein several % the polarization component intersecting orthogonally therewith is included. These lasers are so disposed that the principal component light of the laser 11 is parallel to the plane of the figure and the principal component light of the laser 12 is perpendicular to the plane. The output light from the laser 11 is made into parallel beams as it passes a lens 51 and the principal component light is transmitted through a polarization filter 4 and is conducted with a convergent lens 6 to an output waveguide 3. The auxiliary light is reflected by said filter and is conducted with a convergent leng 7 to a photodetector 2 for monitoring. On the other hand, the principal component light of the output light from the laser 12 is reflected by the filter 4 and is conducted to an output optical waveguide 2. The auxiliary component light thereof is transmitted through said filter and is conducted to the photodetector 2.
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KOBAYASHI YUKIO
AIDA KAZUO
YANAGIMOTO KANJI
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