Optical waveguides – Temporal optical modulation within an optical waveguide – Electro-optic
Reexamination Certificate
2008-05-13
2008-05-13
Kim, Ellen E. (Department: 2874)
Optical waveguides
Temporal optical modulation within an optical waveguide
Electro-optic
C385S045000
Reexamination Certificate
active
07373025
ABSTRACT:
In the present invention, for example with regards to a Mach-Zehnder type LN modulator which uses a Z-cut LN substrate, by providing a step by forming an etching part on the surface of the LN substrate, and forming an optical waveguide so as to position a pair of branching waveguides of a Mach-Zehnder interferometer in the step portion, a height difference is produced between the branching waveguides, in the perpendicular direction to the substrate surface. As a result, lines of electric force directed from a signal electrode provided above one branching waveguide towards a ground electrode provided above an other branching waveguide are hardly dispersed, and a desired electro-optic effect can be obtained at a lower drive voltage.
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Extended European Search Report issued in European Patent Application No. 07005365.7-2205, mailed on Jun. 1, 2007.
Fujitsu Limited
Kim Ellen E.
Staas & Halsey , LLP
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