Rare earth doped double clad optical fiber with plurality of air holes and stress rods
AssigneeCorning Incorporated
InventorsXin Chen, Ji Wang, Joohyun Koh, Ming-Jun Li, Daniel Nolan, Donnell Walton, Luis Zenteno
Life of this patent
Estimating the term…
Abstract
An optical fiber including: (i) a silica based, rare earth doped core having a first index of refraction n1; and (ii) at least one silica based cladding surrounding the core and having a second index of refraction n2, such that n1>n2, said cladding having a plurality of stress rods and a plurality of air holes extending longitudinally through the length of said optical fiber; wherein said optical fiber supports a single polarization mode or poses-polarization maintaining properties within the operating wavelength range.
Claims21
An optical fiber comprising:
- (i). a silica based, rare earth doped core having a first index of refraction n1;
- (ii). at least one silica based cladding surrounding the core and having a second index of refraction n2, such that n1>n2, said cladding having a plurality of stress rods and a plurality of air holes extending longitudinally through the length of said optical fiber;
- wherein said optical fiber supports a single polarization mode or poses polarization maintaining properties within the operating wavelength range.
A method of manufacturing optical fiber comprising the steps of:
- (i) providing a preform having a rare earth doped core overclad with a silica based layer;
- (ii) providing a plurality of longitudinal groves within said silica based layer, thereby making a grooved preform,
- (iii) inserting said grooved preform into silica based tube, thereby forming a plurality of longitudinal holes within said tube;
- (iv) inserting silica based rods into some of the holes, thereby forming a plurality of stress applying parts;
- (v) drawing the optical fiber while applying positive pressure to the holes that do not contain the stress rods.
A method of manufacturing optical fiber comprising the steps of:
- (i) providing a preform having a rare earth doped core overclad with a silica based layer;
- (ii) providing a plurality of longitudinal groves within said silica based layer, thereby making a grooved preform,
- (iii) inserting said grooved preform into silica based tube overclad with silica soot;
- (iv) inserting silica based rods into some of the holes;
- (v) consolidating said soot while applying positive pressure to the grooved areas that that do not contain the stress rods, thereby forming a glass preform containing a plurality of longitudinal holes;
- (vi) utilizing said glass preform containing a plurality of longitudinal holes by surrounding it with a layer of down doped silica soot;
- (vii) consolidation said glass preform containing downdoped silica soot to form an all glass preform, while retaining said plurality of air holes;
- (viii) drawing the optical fiber while applying positive pressure to said holes.
An optical fiber comprising:
- (i). a silica based core having a first index of refraction n1;
- (ii). at least one silica based cladding surrounding the core and having a second index of refraction n2, such that n1>n2, said cladding having a plurality of stress rods and a plurality of air holes extending longitudinally through the length of said optical fiber;
- wherein said optical fiber supports a single polarization mode or poses polarization maintaining properties within the operating wavelength range.
Dependencies are inferred from the claim text.