The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Mar. 13, 2001
Filed:
Apr. 15, 1998
Michel Duguay, Ste-Foy, CA;
Dominique Brichard, Quebec City, CA;
Vincent Delisle, Ottawa, CA;
Uwe Langbein, Bickenbach, DE;
Udo Trutschel, Brookline, MA (US);
Other;
Abstract
The optical device provides dispersion adjustment or compensation using resonant coupling between a first waveguide and a second waveguide which has a variable thickness and a significantly different index of refraction. The two waveguides are optically coupled about a lateral coupling surface, and as light propagates down the waveguide, it passes from one waveguide to the other at a predetermined position along the propagation axis depending on the thickness of the second waveguide. Mode converters are used at the input and output of the device to provide for more efficient operation. The first waveguide can be made of silica and the second waveguide of silicon, thus providing a differential in the index of refraction of about 2. For dispersion compensation, in which shorter wavelengths need to be retarded with respect to longer wavelengths, the profile of the thickness of the second waveguide is such that shorter wavelengths spend more time in the silicon than do longer wavelengths. The shorter wavelength components are thus slowed down more than the longer wavelength components in the optical communications signal.