Low loss optical fibers with fluorine and chlorine codoped core regions

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...

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

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