Rare earth doped and large effective area optical fibers for fiber lasers and amplifiers
First Claim
Patent Images
1. A large-core optical fiber comprising:
- a core having a core radius ρ and
a core index of refraction ncore, wherein said core comprises a doped region having an area of at least 200 μ
m square;
a first cladding disposed about said core, said first cladding having an outer radius ρ
1 and an index of refraction nc1, said core and said first cladding having a difference in index of refraction Δ
n=ncore−
nc1; and
a second cladding disposed about said first cladding, said first cladding and said second cladding having a difference in index of refraction Δ
n1,wherein the first cladding radius, ρ
1, is greater than about 1.1ρ and
less than about 2ρ
, and the refractive index difference between said first cladding and said second cladding, Δ
n1, is greater than about 1.5Δ
n and less than about 50Δ
n.
0 Assignments
0 Petitions
Accused Products
Abstract
Various embodiments described herein include rare earth doped glass compositions that may be used in optical fiber and rods having large core sizes. Such optical fibers and rods may be employed in fiber lasers and amplifiers. The index of refraction of the glass may be substantially uniform and may be close to that of silica in some embodiments. Possible advantages to such features include reduction of formation of additional waveguides within the core, which becomes increasingly a problem with larger core sizes.
281 Citations
35 Claims
-
1. A large-core optical fiber comprising:
-
a core having a core radius ρ and
a core index of refraction ncore, wherein said core comprises a doped region having an area of at least 200 μ
m square;a first cladding disposed about said core, said first cladding having an outer radius ρ
1 and an index of refraction nc1, said core and said first cladding having a difference in index of refraction Δ
n=ncore−
nc1; anda second cladding disposed about said first cladding, said first cladding and said second cladding having a difference in index of refraction Δ
n1,wherein the first cladding radius, ρ
1, is greater than about 1.1ρ and
less than about 2ρ
, and the refractive index difference between said first cladding and said second cladding, Δ
n1, is greater than about 1.5Δ
n and less than about 50Δ
n. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35)
-
Specification