Laser and photodetector coupled by planar waveguides
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United States of America Patent
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Feb 12, 2008
Grant Date -
Dec 30, 2004
app pub date -
Apr 29, 2004
filing date -
Apr 29, 2003
priority date (Note) -
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Abstract
An optical apparatus comprises: a waveguide substrate; three planar optical waveguides formed on the substrate, each comprising a transmission core and cladding; a laser positioned to launch its optical output to propagate along the first waveguide; a photodetector positioned to receive an optical signal propagating along the second waveguide; and means formed on the substrate for i) transferring a first fraction of laser optical output propagating along the first waveguide to the second waveguide, and ii) transferring a second fraction of the laser optical output propagating along the first waveguide to the third waveguide. The transferring means may comprise: i) a pair of parallel spaced-apart tap core segments; ii) a branched splitter core; or iii) a lateral splitter core.
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