Corning Incorporated

Nauchny Tsenir Volokonnoi Optiki Pri Institute Obschei Fiziki Rossiiskoi

Rostislav R Khrapko

Adam J G Ellison

Dana Craig Bookbinder

Matthew John Dejneka

Lisa Anne Moore

Susan Lee Schiefelbein

Keith Leonard House

Evgeny Mikhailovich Dianov

Laura J Ball

Bruno P M Baney

Konstantin Mikhailovich Golant

Vladimir Ivanovich Karpov

Vladimir Nikolaevich Protopopov

Mikhail Vladimirovich Grekov

A method of forming an alkali metal oxide-doped optical fiber by diffusing an alkali metal into a surface of a glass article is disclosed. The silica glass article may be in the form of a tube or a rod, or a collection of tubes or rods. The silica glass article containing the alkali metal, and impurities that may have been unintentionally diffused into the glass article, is etched to a depth sufficient to remove the impurities. The silica glass article may be further processed to form a complete optical fiber preform. The preform, when drawn into an optical fiber, exhibits a low attenuation.

Method for making low loss optical fiber

The present invention relates to a glass article for use as an optical waveguide fiber and more particularly to an optical waveguide fiber, the core of which is doped with a chalcogenide element to significantly increase the refractive index of the core. The subject of this invention is novel doped silica core compositions wherein a portion of the oxygen in the silica is replaced with either sulfur, selenium or tellurium using plasma enhanced chemical vapor deposition (PECVD). These compositions are designed to have higher refractive indices than silica, low coefficients of expansion, high optical transparency, and appropriate viscosity and softening points to make them ideal candidates for use as optical waveguide fibers.

Chalcogenide doping of oxide glasses

Mode field diameter conversion fiber, method for locally changing a

These glasses incorporate a combination of F and Al.sub.2 O.sub.3 to achieve even wider fluorescence and improved gain flatness. In addition, SPCVD incorporates large amounts of N into low-loss fiber whose high charge has an impact on rare earth behavior. The Surface Plasma Chemical Vapor Deposition (SPCVD) produces fiber preforms with high levels of F, Al.sub.2 O.sub.3, and N. These heavily fluorinated glasses provide much broader Er.sup.3+ emission than Type I or Type II silica for enhanced multichannel amplifiers. SPCVD successfully fluorinates silica with losses below 5 dB/km and increased Er.sup.3+ emission width.

SPCVD silicate glasses

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Moscow, Russia

Rostislav R Khrapko