Optical fiber
First Claim
Patent Images
1. An optical fiber, comprising:
- a central core surrounded by an outer optical cladding, said central core (i) including at least two core dopants, wherein the radial concentration of at least one of said core dopants varies substantially continuously over said central core, and (ii) having a radius r1 that is between about 3.5 microns and 4.5 microns and a positive refractive index difference Δ
n1 with said outer optical cladding of between about 4.2×
10−
1 and 6.2×
10−
3;
a first inner cladding positioned between said central core and said outer optical cladding, said first inner cladding having a radius r2 that is between about 7.5 microns and 14.5 microns and a refractive index difference Δ
n2 with said outer optical cladding of between about −
1.2×
10−
3 and 1.2×
10−
3; and
a depressed, second inner cladding positioned between said first inner cladding and said outer optical cladding, said second inner cladding having a radius r3 that is between about 12.0 microns and 25.0 microns and a refractive index difference Δ
n3 with said outer optical cladding of between about −
15×
10−
3 and −
3×
10−
3.
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Abstract
An improved optical fiber achieves both reduced bending and microbending losses, as well as a much higher Brillouin threshold, as compared to standard transmission fibers. The optical fiber comprises a core including at least two dopants and having a refractive index difference Δn1 with an outer optical cladding, a first inner cladding having a refractive index difference Δn2 with the outer cladding, and a depressed, second inner cladding having a refractive index difference Δn3 with the outer cladding of less than −3×10−3. The radial concentration of at least one of the core dopants varies continuously over the entire core region of the optical fiber.
411 Citations
32 Claims
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1. An optical fiber, comprising:
-
a central core surrounded by an outer optical cladding, said central core (i) including at least two core dopants, wherein the radial concentration of at least one of said core dopants varies substantially continuously over said central core, and (ii) having a radius r1 that is between about 3.5 microns and 4.5 microns and a positive refractive index difference Δ
n1 with said outer optical cladding of between about 4.2×
10−
1 and 6.2×
10−
3;a first inner cladding positioned between said central core and said outer optical cladding, said first inner cladding having a radius r2 that is between about 7.5 microns and 14.5 microns and a refractive index difference Δ
n2 with said outer optical cladding of between about −
1.2×
10−
3 and 1.2×
10−
3; anda depressed, second inner cladding positioned between said first inner cladding and said outer optical cladding, said second inner cladding having a radius r3 that is between about 12.0 microns and 25.0 microns and a refractive index difference Δ
n3 with said outer optical cladding of between about −
15×
10−
3 and −
3×
10−
3. - 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)
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Specification