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:
Feb. 26, 2002
Filed:
Dec. 29, 1999
Mark F Krol, Painted Post, NY (US);
Yongqian Liu, Painted Post, NY (US);
Corning Incorporated, Corning, NY (US);
Abstract
A Mach-Zehnder device includes a delay element in one arm which delays propagation of light at a first wavelength relative to propagation of light at a second wavelength. The delay element may be made up of a grating having a period which causes coupling of the first wavelength from a first mode into a second mode. In another aspect, the invention includes a second grating positioned downstream from the first grating and having a period which causes coupling of the portion of light from the second propagation mode back into the first propagation mode. Also disclosed is an optical waveguide in which light at a wavelength &lgr; can propagate in at least a first and a second mode. The waveguide has an effective index of refraction n with respect to the first propagation mode of &lgr;, and an effective index of refraction n with respect to the second propagation mode. A grating formed in said waveguide and having a period approximately equal to(&lgr;/2)(n −n ).