Photonic crystal fiber

US6243522A · kind A · utility

Assignee

• CORNING INCORPORATED · US

Inventors

• Douglas Clippinger Allan · Corning, US
• Nicholas Francis Borrelli · Elmira, US
• James C. Fajardo · Corning, US
• Richard Michael Fiacco · Corning, US
• Daniel Warren Hawtof · Corning, US
• James Andrew West · Corning, US

Key dates

• Filing date: Nov 5, 1999
• Grant date: Jun 5, 2001
• Expiry date: Nov 5, 2019

Classification

• Technology area (CPC H): Electricity
• CPC primary: H01S3/06741
• WIPO field: Optics
• WIPO sector: Instruments

Abstract

Disclosed is an optical waveguide fiber preform which is an assembly of one or more core rods surrounded by a plurality of clad rods. The clad rods have a central portion and a surrounding layer, in which the refractive index of the central portion is lower than that of the surrounding layer. The preform is drawn into an optical waveguide fiber that has a two component clad layer. Proper choice of the central portion and surrounding layer provide a waveguide fiber that is endlessly single mode. Alternative embodiments include fibers containing dopants that enhance fiber photosensitivity or which provide stress-induced or asymmetric-refractive-index-induced birefringence in the waveguide fiber.