Optical waveguides – With optical coupler – Particular coupling structure
Reexamination Certificate
2005-01-04
2005-01-04
Font, Frank G. (Department: 2877)
Optical waveguides
With optical coupler
Particular coupling structure
C385S041000, C385S129000, C372S020000, C372S064000
Reexamination Certificate
active
06839488
ABSTRACT:
The index of refraction of waveguide structures can be varied by altering carrier concentration. The waveguides preferably comprise semiconductors like silicon that are substantially optically transmissive at certain wavelengths. Variation of the carrier density in these semiconductors may be effectuated by inducing an electric field within the semiconductor for example by apply a voltage to electrodes associated with the semiconductor. Variable control of the index of refraction may be used to implement a variety of functionalities including, but not limited to, tunable waveguide gratings and resonant cavities, switchable couplers, modulators, and optical switches.
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Miyanago, S. and T. Asak
California Institute of Technology
Font Frank G.
Kianni Kevin C
Knobbe Martens Olson and Bear LLP
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