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US 11,237,321 B2Granted
High chlorine content low attenuation optical fiber
AssigneeCorning Incorporated
InventorsGeorge Edward Berkey, Dana Craig Bookbinder, Ming-Jun Li, Pushkar Tandon
Life of this patent
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Abstract
An optical fiber having a core comprising silica and greater than 1.5 wt % chlorine and less than 0.5 wt % F, said core having a refractive index Δ1MAX, and an inner cladding region having refractive index Δ2MIN surrounding the core, where Δ1MAX>Δ2MIN.
Claims12
A method for making an optical fiber preform, the method comprising:
- exposing a silica soot core preform having a surface area greater than 10 m2/gm to an atmosphere comprising a chlorine-containing compound at temperatures higher than 1300° C. to form a chlorine doped soot core preform;
- sintering the soot core preform to form a core portion of the optical fiber preform such that the chlorine concentration in said core portion is greater than or equal to 1.5 wt % chlorine;
- and
- forming a cladding layer over said core portion of said fiber preform, said cladding layer comprising fluorine greater than 0.15 wt %, wherein a molar ratio of the chorine in the core portion to the fluorine in the cladding layer is ≥1.
1 more element
A method for making an optical fiber preform, the method comprising:
- exposing a silica soot core preform having a surface area greater than 10 m2/gm to an atmosphere comprising a chlorine-containing compound at temperatures higher than 1300° C. to form a chlorine doped soot core preform;
- and
- sintering the soot core preform to form a core portion of the optical fiber preform such that the chlorine concentration in said core portion is greater than or equal to 1.5 wt % chlorine, wherein said step of exposing the silica soot preform to an atmosphere comprising a chlorine-containing compound comprises a first chlorine doping step comprising exposing the preform to an atmosphere comprising SiCl4, and subsequent to said first exposing step, exposing the preform to atmosphere comprising water or oxygen, and thereafter performing a second chlorine doping step in an atmosphere comprising SiCl4 at temperatures higher than 1300° C.
A method for making an optical fiber preform, the method comprising:
- exposing a silica soot core preform having a surface area greater than 10 m2/gm to an atmosphere comprising a chlorine-containing compound at temperatures higher than 1300° C. to form a chlorine doped soot core preform;
- and
- sintering the soot core preform to form a core portion of the optical fiber preform such that the chlorine concentration in said core portion is greater than or equal to 1.5 wt % chlorine, wherein said step of exposing the silica soot preform to an atmosphere comprising a chlorine-containing compound comprises a first chlorine doping step comprising exposing the preform to an atmosphere comprising 1) a mixture of SiCl4 and water or 2) a mixture of SiCl4 and oxygen, and said method further comprises chlorine doping the preform in a second chlorine doping step in an atmosphere comprising SiCl4 at temperatures higher than 1300° C.
Dependencies are inferred from the claim text.