Optical waveguides – With optical coupler – Particular coupling function
Reexamination Certificate
2005-08-09
2005-08-09
Ullah, Akm Enayet (Department: 2874)
Optical waveguides
With optical coupler
Particular coupling function
C385S040000, C385S039000
Reexamination Certificate
active
06928212
ABSTRACT:
Two right and left optical waveguides are provided so as to pass through a first directional coupler, a phase shifter, and a second directional coupler and so that directional couplers are provided in the first directional coupler portion and the second directional coupler portion. A third electrode is provided between these optical waveguides. A first electrode is provided on the left side of the left optical waveguide, and a second electrode is provided on the right side of the right optical waveguide. These electrodes are extended into the first directional coupler. Upon the application of a bias voltage, the voltage is simultaneously applied to all the first to third electrodes. By virtue of this construction, a waveguide-type optical control device can be realized which, in a directional coupler-type Mach-Zehnder (MZ) construction, can improve the extinction ratio without the complication of the construction.
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NEC Corporation
Ullah Akm Enayet
Young & Thompson
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