Rare earth doped single polarization double clad optical fiber and a method for making such fiber

US7203407B2 · kind B2 · utility

Assignee

• CORNING INCORPORATED · US

Inventors

• George E. Berkey · Pine City, US
• Xin Chen · Taoyuan, TW
• Joohyun Koh · Horseheads, US
• Ming-Jun Li · Horseheads, US
• Daniel Aloysius Nolan · Corning, US
• Donnell Thaddeus Walton · Corning, US
• Ji Wang · Corning, US
• Luis Alberto Zenteno · Corning, US

Key dates

• Filing date: Feb 14, 2005
• Grant date: Apr 10, 2007
• Expiry date: Mar 13, 2025

Classification

• Technology area (CPC H): Electricity
• CPC primary: H01S3/1695
• WIPO field: Optics
• WIPO sector: Instruments

Abstract

An optical fiber, comprising: (i) a rare earth doped silica based elongated core with a first refractive index (n1) with an aspect ratio of 1:5 to 1; (ii) a silica based moat abutting and at least substantially surrounding the core, the moat having a refractive index n2, wherein n2<n1; (iii) a silica based inner cladding surrounding the moat, the inner cladding having a third refractive index (n3), wherein n1>n3; and n3>n2; (iv) a silica based outer cladding surrounding said inner cladding, the outer cladding having a fourth refractive index (n4), such that n4<n3; the optical fiber exhibits single polarization at the operating wavelength band.