Optical waveguides – Temporal optical modulation within an optical waveguide – Electro-optic
Reexamination Certificate
2008-07-15
2008-07-15
Sanghavi, Hemang (Department: 2874)
Optical waveguides
Temporal optical modulation within an optical waveguide
Electro-optic
C385S003000, C385S008000
Reexamination Certificate
active
11646452
ABSTRACT:
In an optical modulator of the invention, a signal electrode and a ground electrode are formed along a pair of branching waveguides of a Mach-Zehnder type optical waveguide, and a first region positioned on an input side of an interaction section of light and an electric signal is made a forward modulation section, and a second region positioned on an output side is made an inverse modulation section, and a spacing or the like of the signal electrode and the ground electrode is optimized so that that a loss produced in the second region is relatively greater than a loss produced in the first region, with respect to a high frequency component of an electric signal propagated through the signal electrode. As a result a wider modulation bandwidth can be realized.
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European Search Report; mailed Apr. 16, 2007 and presents case and prior art information list; this is the first citation of the references in any communication from foreign patent office in a counterpart foreign application.
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