Low loss optical fibers with fluorine and chlorine codoped core regions
AssigneeCorning Incorporated
InventorsDana Craig Bookbinder, Ming-Jun Li, Pushkar Tandon
Life of this patent
Estimating the term…
Abstract
A co-doped optical fiber is provided having an attenuation of less than about 0.17 dB/km at a wavelength of 1550 nm. The fiber includes a core region in the fiber having a graded refractive index profile with an alpha of greater than 5. The fiber also includes a first cladding region in the fiber that surrounds the core region. Further, the core region has an relative refractive index of about −0.10% to about +0.05% compared to pure silica. In addition, the core region includes silica that is co-doped with chlorine at about 1.2% or greater by weight and fluorine between about 0.1% and about 1% by weight.
Claims31
A single mode optical fiber, comprising:
- a fiber having an attenuation of less than about 0.17 dB/km at a wavelength of 1550 nm, the fiber comprising
- a core region in the fiber having a graded refractive index profile with an alpha of greater than 5;
- and
- a first cladding region in the fiber that surrounds the core region,
- wherein the core region has an relative refractive index of about −0.10% to about +0.05% compared to pure silica, and
- further wherein the core region comprises silica co-doped with chlorine at about 1.2% or greater by weight and fluorine between about 0.1% and about 1% by weight.
A single mode optical fiber, comprising:
- a fiber having an attenuation of less than about 0.17 dB/km at a wavelength of 1550 nm, the fiber comprising
- a core region in the fiber that comprises silica co-doped with fluorine and chlorine;
- and
- a first cladding region in the fiber that surrounds the core region,
- wherein the core region has a graded refractive index profile having an alpha of greater than 5,
- wherein the first cladding region comprises a depressed region having a relative refractive index that is lower than a relative refractive index of the core region, and
- wherein the core region comprises silica co-doped with fluorine and chlorine such that the sum of the fluorine and chlorine in weight percent divided by the fluorine in weight percent is greater than a factor of about 1.5.
A few-moded optical fiber, comprising:
- a core region in the fiber that comprises silica co-doped with fluorine and chlorine, the core region having an relative refractive index of about −0.10% to about +0.05% compared to pure silica, and a radius of about 6.0 microns to about 50 microns, wherein the core region is configured to transmit optical data in greater than 2 and less than 8 modes at a wavelength of 1550 nm;
- and
- a first cladding region in the fiber that surrounds the core region,
- wherein the first cladding region comprises a depressed region having a relative refractive index that is lower than a relative refractive index of the core region,
- further wherein the fiber has an attenuation of less than about 0.17 dB/km at a wavelength of 1550 nm, and
- wherein the core region comprises silica co-doped with fluorine and chlorine such that the sum of the fluorine and chlorine in weight percent divided by the fluorine in weight percent is greater than a factor of about 1.5.
Dependencies are inferred from the claim text.