Corning Incorporated

Sonya Marie Raney

Pushkar Tandon

Snigdharaj Kumar Mishra

Brian Lee Harper

Dana Craig Bookbinder

Ming-Jun Li

Paul Andrew Chludzinski

Rostislav Radiyevich Khrapko

Xin Chen

Peter Gottfried Hebgen

Samir Khanna

Charles Frederick Laing

Dominick Fiordimalva

Chukwuemeka Benneth Onuh

Jitendra Balakrishnan

Chukwuemeka B Onuh

An optical fiber with low attenuation and methods of making same are disclosed. The optical fiber has a core, an inner cladding surround the core, and an outer cladding surrounding the inner cladding. The outer cladding is chlorine-doped such that the relative refractive index varies as a function of radius. The radially varying relative refractive index profile of the outer cladding reduces excess stress in the core and inner cladding, which helps lower fiber attenuation while also reducing macrobend and microbend loss. A process of fabricating the optical fiber includes doping an overclad soot layer of a soot preform with chlorine and then removing a portion of the chlorine dopant from an outermost region of the overclad soot layer. The soot preform with the modified chlorine dopant profile is then sintered to form a glass preform, which can then be used for drawing the optical fiber.

Optical fibers having a varying clad index and methods of forming same

One embodiment of the disclosure relates to a method of making an optical fiber comprising the steps of: (i) exposing a silica based preform with at least one porous glass region having soot density of &#x3c1; to a gas mixture comprising SiClhaving SiClmole fraction yat a doping temperature Tsuch that parameter X is larger than 0.03 to form the chlorine treated preform, wherein and &#x3c1;is the density of the fully densified soot layer; and (ii) exposing the chlorine treated preform to temperatures above 1400&#xb0; C. to completely sinter the preform to produce sintered optical fiber preform with a chlorine doped region; and (iii) drawing an optical fiber from the sintered optical preform.

Method of making updoped cladding by using silicon tertrachloride as the dopant

An optical fiber includes a central glass core region comprising maximum refractive index delta percent &#x394;, a first inner annular region surrounding said core comprising refractive index delta percent &#x394;, a depressed annular region surrounding said inner annular region and comprising &#x394;and a third annular region surrounding the depressed annular region comprising refractive index delta percent &#x394;; wherein the third annular region comprises chlorine an amount greater than 0.2 weight percent in a region which is within 5 microns from the depressed annular region, wherein &#x394;&#x3e;&#x394;&#x3e;&#x394;&#x3e;&#x394;. The difference between &#x394;and &#x394;is greater than 0.01 and profile volume, |V| is at least 50% &#x394;&#x3bc;m.

Low bend loss optical fiber

According to an embodiment of the invention a method of manufacturing optical fiber cane comprises the steps of: (i) providing a core rod manufactured of relatively low viscosity glass; (ii) depositing SiObased soot around the core rod to form a soot preform, the soot being of relatively high viscosity material such that the softening point of the low viscosity glass is at least 200&#xb0; C. lower than the viscosity of the high viscosity outer core region; and (iii) consolidating the soot of the soot preform by exposure to hot zone at temperatures of 1000&#xb0; C.-1600&#xb0; C. The soot is consolidated by heating the outer portion of the soot preform at a relatively fast heating rate, the heating rate being sufficient to densify the soot, so as to render the densified material with enough rigidity to confine the heated core rod and to prevent the heated core rod from puddling.

Reduction of optical fiber cane/preform deformation in consolidation

A method for measuring longitudinal variation in chromatic dispersion in an optical fiber, comprising: (i) launching into a first end and a second end of optical fiber an optical signal at a wavelength &#x3bb;to collect backscatter power P(z) for different positions z within said optical fiber and providing measured OTDR backscatter traces; (ii) deriving from the measured OTDR backscatter traces at the single OTDR wavelength &#x3bb;either (a) the longitudinal MFD(z) data or (b) the relative MFD data; and (iii) calculating estimated longitudinal dispersion D(z) from the longitudinal MFD(z) data or the relative MFD data, without utilizing any other wavelength data.

Method of estimating and measuring longitudinal dispersion in optical fibers

Growing community of inventors

Wrightsville Beach, NC, United States of America

Sonya Marie Raney