Corning Incorporated

Simit Mayank Patel

Ming-Jun Li

Xin Chen

Pushkar Tandon

Scott Robertson Bickham

Snigdharaj Kumar Mishra

Anping Liu

Jeffery Scott Stone

John Steele Abbott, Iii

Elios Klemo

Kangmei Li

Ian David Cook

Amanda Lee Billings

Oleksandr Kogan

Daniel J Halvorson

Sean Nicole DeMass

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 of manufacturing a multimode optical fiber includes specifying a peak wavelength &#x3bb;for the multimode optical fiber. The peak wavelength &#x3bb;corresponds to a wavelength at which the multimode optical fiber has a maximum bandwidth. The multimode optical fiber comprises a core and a cladding surrounding and directly adjacent to the core. The core has a radius rand a maximum relative refractive index &#x394;&#x3e;0. The cladding comprises a depressed-index region having a minimum relative refractive index &#x394;&#x3c;0 and a volume v. A draw tension T for the multimode optical fiber is selected based on a correlation relating peak wavelength &#x3bb;to draw tension T, the correlation comprising a correlation constant. The correlation constant K is a function of at least one of &#x394;, r, v, &#x394;, and &#x3bb;. The multimode optical fiber is drawn from a preform at the draw tension T.

Method for manufacturing multimode optical fibers

A method of manufacturing a tuned optical fiber includes providing a first preform from a set of like preforms each having substantially the same refractive index profile, including amount of axial variation relative to a target refractive index profile. The method includes drawing a reference optical fiber from the first preform and measuring a variation in an optical or physical property as a function of axial position. The method also includes drawing from a second preform from the set of like preforms the tuned optical fiber. The drawing includes using a time-varying tension that reduces the amount of variation of the optical or physical property of interest. The time-varying tension is defined by an amount of axial stress imparted to the tuned fiber needed to alter the refractive index profile and the at least one optical or physical property based on a stress-optic effect.

Method of manufacturing an optical fiber using axial tension control to reduce axial variations in optical properties

A multimode optical fiber having a core region. The core region includes silica, has an outer radius r, and has a maximum relative refractive index of about 1.5% or less. Additionally, the multimode optical fiber is configured to have an effective bandwidth of about 4.7 GHz-Km or greater for an excited portion of the core region that has a diameter greater than 50 microns, the effective bandwidth being at a wavelength that is within a range of between about 800 and about 1370 nm.

Multimode optical fiber with increased bandwidth

An optical fiber including a multimode core having a radius, R, and a maximum relative refractive index, &#x394;, at a wavelength &#x3bb;, an inner clad layer surrounding the core and having a radial thickness, T, and a minimum relative refractive index, &#x394;, of about 0.0% at a wavelength of &#x3bb;, an intermediate clad layer surrounding the inner clad layer and having a radial thickness, T, and a maximum relative refractive index &#x394;and an outer clad layer surrounding the inner clad layer and having a radial thickness, T, and a maximum relative refractive index, &#x394;, at a wavelength of &#x3bb;. The optical fiber satisfies the following relationship: &#x394;&#x3e;&#x394;&#x3e;&#x394;, and the optical fiber exhibits an overfilled bandwidth of greater than or equal to about 1.5 GHz-km at &#x3bb;.

Multimode fiber with intermediate clad layer

Growing community of inventors

Greensboro, NC, United States of America

Simit Mayank Patel