Optical waveguides – Directional optical modulation within an optical waveguide – Electro-optic
Reexamination Certificate
2007-01-16
2008-11-04
Font, Frank G (Department: 2883)
Optical waveguides
Directional optical modulation within an optical waveguide
Electro-optic
C385S003000, C385S004000, C385S008000, C385S039000, C385S040000, C385S045000
Reexamination Certificate
active
07447389
ABSTRACT:
An optical modulator includes a signal electrode for application of modulation signals whereby light propagated over an optical waveguide is modulated, and bias electrodes for application of a bias voltage for controlling an operating point for the modulation signals. A buffer layer is provided between a substrate exhibiting electro-optical effect and the bias electrodes, but at regions where no optical waveguide is formed beneath the bias electrodes, no buffer layer is provided, and the bias electrodes are provided directly upon the substrate. This configuration enables bias voltage to be reduced.
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Font Frank G
Fujitsu Limited
Mooney Michael P
Staas & Halsey , LLP
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