Optical multiplexer reduced in background light
AssigneesSEIREN KST Corp., University of Fukui
InventorsAkira Himeno, Koichi Horii, Toshio Katsuyama, Shoji Yamada, Akira Nakao
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Abstract
An optical multiplexer reduced in background light and reduced in size is provided. The optical multiplexer takes a plurality of light beams having different wavelengths as input from respective waveguides, and outputs multiple light obtained by multiplexing the plurality of light beams by a directional coupler. Background light is reduced by a reflection groove which reflects excess light outputted from a discard port of the directional coupler, and downsizing of the optical multiplexer is achieved.
Claims5
An optical multiplexer to which a plurality of light beams having different wavelengths are inputted from respective waveguides, and which outputs a multiple light beam obtained by multiplexing the plurality of light beams by a directional coupler, wherein
- the optical multiplexer includes a reflection groove configured to reduce background light by reflecting excess light outputted from a discard port of the directional coupler, and
- a cladding layer ranging from the reflection groove to an output end surface of the optical multiplexer is removed, with a part of the cladding layer around an output port of the optical multiplexer being left intact.
Dependencies are inferred from the claim text.