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:
Jan. 08, 2002
Filed:
Nov. 28, 2000
George E. Berkey, Pine City, NY (US);
Liang Dong, Painted Post, NY (US);
Corning Incorporated, Corning, NY (US);
Abstract
Disclosed is a fiber optic filter that includes a central core, a ring core concentric with the central core, an inner cladding region of refractive index n between the central and ring cores, and a cladding layer of refractive index n surrounding the ring core. The maximum refractive index n of the central core and the maximum refractive index n of the ring core are greater than n and n . The propagation constants of one core mode and one ring mode are different at wavelengths except for at least one wavelength &lgr; whereby power transfers between the two cores at &lgr; . At least a portion of the fiber optic filter fiber is wound around a reel to subject it to a continuous curvature, the radius of which determines the amplitude of the attenuation. Such fibers are useful in fiber amplifiers in which the central core contains active dopant ions.