Optical coupler
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United States of America Patent
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-
May 22, 2007
Grant Date -
Jun 8, 2006
app pub date -
Dec 23, 2003
filing date -
Dec 23, 2002
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
An optical coupler comprises an input waveguide, an intermediate waveguide, an output waveguide, a first grating situated between the input and intermediate waveguides, and a second grating situated between the intermediate and output waveguides such that, in use, light propagating in the input waveguide is coupled into the intermediate waveguide with the assistance of the first grating, and thence is coupled into the output waveguide with the assistance of the second grating. The coupler is a directional coupler, in particular a dual grating-assisted directional coupler, and may be used to couple light between an optical fibre and an integrated semiconductor device, or between dissimilar waveguides.
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