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US 6,263,706 B1Granted
Method of controlling fluorine doping in soot preforms
OwnerEvelyn M. Deliso, Claud E. Lacy +1inventors
InventorsEvelyn M. Deliso, Claud E. Lacy, Deborah L. Marlatt
Life of this patent
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Abstract
A method for controlling the refractive index achieved using a fluorine dopant gas, wherein CF4 is employed as the dopant gas, and the soot preform is doped using the CF4 for a time and temperature sufficient to result in a decrease in fluorine dopant nearest the surface which is in contact with the CF4 gas.
Claims48
A method of making a fluorine-doped optical fiber preform comprising of steps of:
- chemically reacting at least some of the constituents of a moving stream of gas mixture comprising at least one glass-forming precursor compound and an oxidizing medium, the reaction resulting in the formation of a glassy silica-based reaction product,
- forming a body by depositing at least a part of the reaction products on a substrate, and
- doping the body with fluorine by contacting a surface of the body with a fluorine containing gas for a time and at a temperature which is sufficiently to result in a fluorine content at or near said surface which is lower than the fluorine content internal to said body and which is lower than the fluorine content at or near said surface when doped at said temperature but for a shorter time.
A method of making a fluorine-doped optical fiber preform comprising the steps of:
- chemically reacting at least some of the constituents of a moving stream of gas mixture comprising at least one glass-forming precursor compound and an oxidizing medium, the reaction resulting in the formation of a glassy silica-based reaction product,
- forming a body by depositing at least a part of the reaction products on a substrate without changing the density thereof, and
- doping the body with fluorine by contacting the body with a fluorine containing gas for a time and at a temperature which is sufficient to result in a lowering of the fluorine content at or near a surface of said body which is in contact with the fluorine containing gas, relative to the fluorine content internal to said body.
A method of making a fluorine-doped optical fiber preform comprising the steps of:
- chemically reacting at least some of the constituents of a moving stream of gas mixture comprising at least one glass-forming precursor compound and an oxidizing medium, the reaction resulting in the formation of a glassy silica-based reaction product,
- forming a body having a substantially constant density by depositing at least a part of the reaction products on a substrate, and
- doping the body with fluorine by contacting the body with a fluorine containing gas for a time and at a temperature which is sufficient to result in a lowering of the fluorine content at or near a surface of said body which is in contact with the fluorine containing gas, relative to the fluorine content internal to said body.
A method of making a fluorine-doped optical fiber preform comprising the steps of:
- chemically reacting at least some of the constituents of a moving stream of gas mixture comprising at least one glass-forming precursor compound and an oxidizing medium, the reaction resulting in the formation of a glassy silica-based reaction product,
- forming a body by depositing at least a part of the reaction products onto a mandrel,
- removing the mandrel to form a cylindrical soot body having a centerline hole therethrough,
- inserting a second body, which is comprised of silica based glassy material, into said hole, and
- doping the body with fluorine by contacting the body with a fluorine containing gas for a time and at a temperature which is sufficient to result in a lowering of the fluorine content at or near a surface of said body which is in contact with the fluorine containing gas, relative to the fluorine content internal to said body.
2 more elements
A method of making a fluorine-doped optical fiber preform comprising the steps of:
- chemically reacting at least some of the constituents of a moving stream of gas mixture comprising at least one glass-forming precursor compound and an oxidizing medium, the reaction resulting in the formation of a glassy silica-based reaction product,
- forming a body by depositing at least a part of the reaction products on a substrate, wherein said body comprises a first core segment comprising a refractive index increasing dopant and a second core segment not having a refractive index increasing dopant, and
- doping the body with fluorine by contacting the body with a fluorine containing gas for a time and at a temperature which is sufficient to result in a lowering of the fluorine content at or near a surface of said body which is in contact with the fluorine containing gas, relative to the fluorine content internal to said body.
Dependencies are inferred from the claim text.