Optical waveguides – With optical coupler – Input/output coupler
Reexamination Certificate
2007-12-12
2011-12-13
Wood, Kevin S (Department: 2874)
Optical waveguides
With optical coupler
Input/output coupler
C385S028000, C385S045000, C385S050000
Reexamination Certificate
active
08078021
ABSTRACT:
A waveguide connecting structure includes a light branching element (111) for branching light from an input optical waveguide (201) including one core into two branched light components having the same optical power and the same phase, and a twin-arm waveguide (113) including a pair of arm waveguides (113A,113B) for outputting the light components branched by the light branching element to a slot waveguide (202) including two cores arranged in parallel at a narrow spacing. The pair of arm waveguides have cores formed in a cladding on a substrate and having a refractive index higher than that of the cladding, and are formed such that the spacing between them gradually narrows and becomes equal to the core spacing of the slot waveguide from the core input ends into which the branched light components enter toward the core output ends from which the light components are output to the slot waveguide.
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NEC Corporation
Wood Kevin S
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