Low loss optical fibers with fluorine and chlorine codoped core regions

A co-doping, optical fiber technology, applied in the direction of multi-layer core/cladding fiber, graded index core/cladding fiber, cladding fiber, etc., can solve fiber attenuation, low intermodal dispersion level, loss And other issues

Active Publication Date: 2018-03-16
CORNING INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, even with the development of DSP, the level of intermodal dispersion should still be minimized
[0005] Various mechanisms cause attenuation and loss characteristics in fiber

Method used

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  • Low loss optical fibers with fluorine and chlorine codoped core regions
  • Low loss optical fibers with fluorine and chlorine codoped core regions
  • Low loss optical fibers with fluorine and chlorine codoped core regions

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0143] In a lathe, prepare a density of approximately 0.5 g / cm by 3 1 meter long 3000 gram silica soot preform: Silica soot was flame deposited onto a 10 mm diameter removable alumina spinner rod, which contained a silica handle. The soot preform is placed in a consolidation furnace and dried and doped in a gaseous atmosphere at about 1225°C with about 45 vol% He, about 12 vol% Cl 2 , about 32 volume% SiCl 4 and about 11 vol% SiF 4 . The assembly is then transferred (downloaded) through a hot zone with a peak temperature of about 1500°C and a ramp rate of about 2.5°C / min in a gaseous atmosphere with about 44 vol% He, about 41 vol% SiCl 4 and about 15 vol% SiF 4 , resulting in a fully densified Cl and F co-doped silica glass core preform.

[0144] The preform was placed in an Ar purged holding oven set at 1000°C for about 24 hours to degas the He dissolved in the glass. The preform was then placed into a redraw furnace set at about 1900°C. Vacuum was then applied to the...

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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 effective 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.

Description

[0001] This application claims priority under 35 U.S.C. §119 to U.S. Provisional Application Serial No. 62 / 147777, filed April 15, 2015, which application is based upon and is hereby incorporated by reference in its entirety. Background technique [0002] The present disclosure relates generally to low-cost, low-attenuation optical fibers for data transmission, and more particularly to optical fiber designs with co-doped core regions. [0003] Low attenuation (eg, optical fibers with an attenuation value < 0.17 dB / km) is an important characteristic of optical fibers configured to transmit data efficiently. [0004] The nonlinear characteristics of optical fibers are also factors that limit the performance of optical fibers for high-speed, long-distance transmission applications. Generally speaking, the nonlinear characteristics of the fiber can be reduced by increasing the effective area of ​​the fiber. This is because power density is inversely proportional to effective a...

Claims

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Application Information

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IPC IPC(8): G02B6/02G02B6/036G02B6/028C03B37/014
CPCC03B37/01446C03B37/01453G02B6/02019G02B6/0281G02B6/0288G02B6/03627G02B6/03655C03C13/045C03C3/06C03C2201/11C03C2201/12C03B37/014C03B2201/12C03B2201/20C03B2203/23C03C13/046G02B6/03683
Inventor D·C·布克班德M-J·李P·坦登
Owner CORNING INC
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