US 7,280,728 B2 · Rare earth doped single polarization double clad optical fiber with plurality of air holes

Abstract

An optical fiber including: (i) a silica based, rare earth doped core having a first index of refraction n1; (ii) a silica based inner cladding surrounding the core and having a second index of refraction n2, such that n1>n2, said inner cladding having a plurality of air holes extending longitudinally through the length of said optical fiber; (iii) a silica based outer cladding surrounding said inner cladding and having a third index of refraction n3, such that n2>n3, wherein said optical fiber supports a single polarization mode within the operating wavelength range.

Claims18

Dependent claims

An optical fiber comprising:

(i) a silica based, rare earth doped core having a first index of refraction n1;
(ii) a silica based inner cladding surrounding the core and having a second index of refraction n2, such that n1>n2, said inner cladding having a plurality of air holes extending longitudinally through the length of said optical fiber;
(iii) a silica based outer cladding surrounding said inner cladding and having a third index of refraction n3, such that n2>n3;
wherein said optical fiber supports only a single polarization mode within the operating wavelength range, such that said fiber has a single polarization band SPB of at least 10 nm.

1 more element

Dependencies are inferred from the claim text.

Facts

Application

10/971,319Filed 22 Oct 2004

Published

US 2006/0088262 A127 Apr 2006

Granted

9 Oct 2007

Term ends

Not estimatedThe source records don’t support an estimate.

Classification29 codes

H01S 3/06716
Constructional details of the fibre, e.g. compositions, cross-section, shape or tapering: fibre compositions or doping with active elements
C03B 37/01234
Removal of preform material: to form longitudinal grooves, e.g. by chamfering
C03B 37/0124
Means for changing or stabilising the shape, e.g. diameter, of tubes or rods in general, e.g. collapsing: means for reducing the diameter of rods…
C03B 37/01413
Made entirely or partially by chemical means , e.g. vapour phase deposition of bulk porous glass either by outside vapour deposition [OVD], or…

Rare earth doped single polarization double clad optical fiber with plurality of air holes

Life of this patent

Rare earth doped single polarization double clad optical fiber with plurality of air holes

Life of this patent

Abstract

Claims18