Corning Incorporated

Lei Jiang

V Srikant

Jeffery Scott Stone

Gang Qi

Sergey Yurevich Ten

Dale Robert Powers

George Edward Berkey

Steven Akin Dunwoody

Freddie G Prince

Disclosed is a dispersion compensating optical fiber that includes a refractive index profile selected to provide dispersion at 1550 nm of between &minus;90 and &minus;150 ps/nm/km; dispersion slope at 1550 nm of less than &minus;1.5 ps/nm /km; and kappa of between 40 and 95. The profile preferably has a core surrounded by a cladding layer of refractive index &Dgr; , and at least three radially adjacent regions including a central core region having &Dgr;1, a moat region having a refractive index &Dgr;2, and an annular ring region having a refractive index &Dgr;3, wherein &Dgr;1>&Dgr;3>&Dgr;c>&Dgr;2.

Dispersion compensating optical fiber

Disclosed is a dispersion compensating optical fiber that includes a core surrounded by a cladding layer of refractive index n . The core includes at least three radially adjacent regions, a central core region, a moat region having a refractive index n that is sufficiently lower than n such that &Dgr; &lE;&minus;0.4%, and a ring region. As the ring region exhibits sufficiently high refractive index at a sufficiently long distance from the outer edge of the moat region, the fiber can exhibit low values of negative dispersion slope at low values of negative dispersion and yet exhibit good bending loss. This ring region is also capable of imparting to the fiber a relatively high cutoff wavelength, so that the present invention is particularly well suited for use in L-band systems. A particularly suitable fiber has an index profile in which that part of the ring region at the transition between the moat and the ring region has a refractive index such that its delta value is close to zero. Also disclosed is a method of forming the fiber of the present invention.

Dispersion compensating fiber

Disclosed is a dispersion compensating optical fiber that includes a core surrounded by a cladding layer of refractive index &Dgr; . The core includes at least three radially adjacent regions, a central core region having &Dgr; a moat region having a refractive index &Dgr; and an annular ring region having a refractive index &Dgr; such that &Dgr; >&Dgr;c>&Dgr; The fiber exhibits a dispersion at 1550 which is less than &minus;30 ps/nm/km, and a &kgr; value obtained by dividing the dispersion value by the dispersion slope which is between 40 and 100.

Disclosed is a dispersion compensating optical fiber that includes a core surrounded by a cladding layer of refractive index &Dgr; . The core includes at least three radially adjacent regions, a central core region having &Dgr;1, a moat region having a refractive index &Dgr;2 and an annular ring region having a refractive index &Dgr;3, such that &Dgr;1>&Dgr;3>&Dgr;c>&Dgr;2. The fiber exhibits a dispersion slope which is less than &minus;1.0 ps/nm /km over the wavelength range 1525 to 1565, a dispersion at 1550 which is less than &minus;30 ps/mn/km, and a &kgr; value obtained by dividing the dispersion value by the dispersion slope which is greater than 35 and preferably between 40 and 100.

A method is disclosed for recovering germanium from a gaseous mixture which includes a germanium-containing compound in vapor or particulate form, acid in vapor form, and water vapor. The gaseous mixture is contacted with a liquid containing water under conditions effective to dissolve the germanium-containing compound in the liquid. The acidity of the resulting liquid mixture is increased under conditions effective to vaporize the germanium-containing compound. The vaporized germanium-containing compound is contacted with one or more aqueous solutions under conditions effective to dissolve and precipitate the germanium-containing compound in at least one of the one or more aqueous solutions, and the resulting precipitate is separated from the at least one of the one or more aqueous solutions. The methods described herein are particularly well suited for recovering germanium from the waste gases produced during optical waveguide manufacturing processes. Germanium recovered by this method can thereafter be used in the production of semiconductors, optical waveguide fibers and optical components.

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Plano, TX, United States of America

Lei Jiang