Corning Incorporated

Amanda Lee Billings

Dana Craig Bookbinder

Pushkar Tandon

Robert Brett Desorcie

Liam Ruan De Paor

Li Yang

Scott Robertson Bickham

John Steele Abbott, Iii

Simit Mayank Patel

Ian David Cook

Methods for classifying a core cane of an multimode optical fiber are disclosed. In embodiments, the method includes determining a relative refractive index profile Δ(r) of the core cane; fitting the relative refractive index profile Δ(r) to an alpha profile Δ(r) defined by: where Δis a relative refractive index at a longitudinal centerline of the core cane, αis a core shape parameter, and ais an outer radius of the core cane; generating a non-alpha residual profile Δ(r)=Δ(r)−Δ(r) for the core cane; computing one or more metrics from Δ(r), and using the one or metrics in a classification of the core cane, the classification comprising a prediction of whether a bandwidth at a pre-determined wavelength of an optical fiber drawn from a preform comprising the core cane exceeds a pre-determined bandwidth at the pre-determined wavelength.

Multimode optical fiber core cane classification method

A method for forming an optical fiber preform and fibers drawn from the preform. The method includes forming a soot cladding monolith, inserting a consolidated core cane into the internal cavity, and processing the resulting core-cladding assembly to form a preform. Processing may include exposing the core-cladding assembly to a drying agent and/or dopant precursor, and sintering the core-cladding assembly in the presence of a reducing agent to densify the soot cladding monolith onto the core cane to form a preform. The preform features low hydroxyl content and low sensitivity to hydrogen. Fibers drawn from the preform exhibit low attenuation losses from absorption by the broad band centered near 1380 nm.

Method of making optical fibers in a reducing atmosphere

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Wilmington, NC, United States of America

Amanda Lee Billings