Spot-size transformer, method of producing spot-size transformer and waveguide-embedded optical circuit using spot-size transformer
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United States of America Patent
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May 22, 2007
Grant Date -
Apr 8, 2004
app pub date -
Oct 3, 2003
filing date -
Oct 8, 2002
priority date (Note) -
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status (Latency Note)
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Abstract
The present invention is to provide a spot-size transformer which can transform the beam spot-size in a waveguide separated by a groove and a waveguide-embedded optical circuit using the spot-size transformer.The spot-size transformer according to the present invention comprises a first optical waveguide having a first core and a first cladding covering substantially the whole surface of the first core, a second optical waveguide having a second core provided as an extension of the first cladding and a second cladding, a transition waveguide positioned between the first and second optical waveguides, the transition waveguide having a first core whose width of the extension becomes gradually narrower as it goes toward the second optical waveguide.
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