Title:
VELOCITY MATCHING ELECTRODE STRUCTURE FOR ELECTRO-OPTIC MODULATORS
Document Type and Number:
WIPO Patent Application WO2002023262
Kind Code:
A8
Abstract:
This is an electro-optic modulator having an electro-optic substrate such as lithium niobate (100), an optical waveguide (200) defined within the substrate, an electrode structure including a microwave transmission line (300) elevated from the substrate by conductive legs (350A). In one embodiment, a low-dielectric constant buffer layer (400) is disposed between the substrate and the transmission line. The conductive legs extend from the transmission line to a surface of the substrate toward the wavequide, through the buffer layer. The microwave transmission line is elevated from the substrate at a distance such that the electrical propagation velocity is at a maximum. The high electrical velocity is offset by a loading capacitance introduced by the conductive legs which slows the electrical velocity down on the transmission line to match the optical velocity. Pairs of opposing conductive legs provide a strong electric filed for modulating the optical signal.
Inventors:
BETTS GARY E
Application Number:
PCT/US2001/028490
Publication Date:
July 25, 2002
Filing Date:
September 12, 2001
Export Citation:
Assignee:
MASSACHUSETTS INST TECHNOLOGY (US)
International Classes:
G02F1/035; G02F1/03; G02F1/225; (IPC1-7): G02F1/035; G02F1/225
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