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US 2002/0159684 A1Published application
Novel optical waveguide switch using cascaded mach-zehnder interferometers
AssigneeZenastra Photonics Inc.
InventorsDe-Gui Sun, Yitao Sun
Life of this patent
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Abstract
An optical signal switch has improved port isolation and extinction ratio by utilizing cascaded or tandem Mach-Zehnder Interferometer (MZI) with thermo-optical or electro-optical refractive index-modulating electrodes on the MZI arms.
Claims7
An optical signal switch, comprising:
- (a) at least first and second Mach-Zehnder Interferometers ((MZI) each having at least one input for receiving an optical signal and at least one output for outputting said optical signal;
- (b) said first and second MZIs being optically interconnected, the output of the first to the input of the second;
- and
- (c) at least one refractive index-modulating electrode in one arm of each of said first and second MZIs
1 more element
Dependencies are inferred from the claim text.