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:
Apr. 09, 2002
Filed:
Feb. 09, 2000
Kunio Kokura, Tokyo, JP;
The Furukawa Electric Co. Ltd., Tokyo, JP;
Abstract
The present invention relates to a fiber grating formed on an optical component for processing optical signals and a method of forming the grating. After the sheath ( ) of an optical fiber ( ) is partially removed, the surface of the bare optical fiber ( ) at an area where the sheath ( ) is removed is covered by a resin film ( ) having a thinness at which ultraviolet light permeability not hindering formation of gratings. Thereafter, by irradiating ultraviolet light (ultraviolet coherent light) via a phase mask ( ), a grating where the refractive index of the core ( ) of the bare optical fiber ) cyclically changes in the beam axis is formed. The resin film ( ) is made of, for example, an organic material having heat resistance, which is not dissolved by ultraviolet ray irradiation, such as polyimide resin, polyamideimide resin, etc. The thickness of the resin film ( ) is 10 &mgr;m or less to ensure that ultraviolet light sufficiently permeates and the convergence of interference light is not lowered.