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US 9,594,210 B2Granted
Optical fiber with large effective area and low bending loss
AssigneeCorning Incorporated
InventorsDana Craig Bookbinder, Ming-Jun Li, Hazel Benton Matthews, III, Snigdharaj Kumar Mishra, Pushkar Tandon
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Abstract
An optical fiber with large effective area, low bending loss and low attenuation. The optical fiber includes a core, an inner cladding region, and an outer cladding region. The core region includes a spatially uniform updopant to minimize low Rayleigh scattering and a relative refractive index and radius configured to provide large effective area. The inner cladding region features a large trench volume to minimize bending loss. The core may be doped with Cl and the inner cladding region may be doped with F.
Claims36
An optical fiber comprising:
- a core region comprising Cl-doped silica glass having a chlorine concentration greater than 1.5 wt %, said core region having an outer radius r1 in the range from 6.0 microns to 10.0 microns and a relative refractive index Δ1;
- an inner cladding region surrounding said core region, said inner cladding region having an outer radius r2 in the range from 22 microns to 38 microns and a relative refractive index Δ2;
- and
- an outer cladding region surrounding said inner cladding region, said outer cladding region having a relative refractive index Δ3, said relative refractive index Δ3 exceeding said relative refractive index Δ2 by at least 0.06%;
- wherein said optical fiber has a cable cutoff of less than 1550 nm, an effective area at 1550 nm of at least 100 micron2, and a bending loss at 1550 nm, determined from a mandrel wrap test using a mandrel with a diameter of 20 mm, of less than 3.5 dB/turn.
2 more elements
Dependencies are inferred from the claim text.