Corning Incorporated

Sabyasachi Sen

Stephan Lvovich Logunov

Michael Thomas Murtagh

Dana Craig Bookbinder

Rostislav Radiyevich Khrapko

Lisa C Chacon

Nicholas Francis Borrelli

Adam James Ellison

Heather Debra Boek

Susan Lee Schiefelbein

James Gary Anderson

Adam J G Ellison

William Anthony Whedon

Wanda Janina Walczak

Calvin Thomas Coffey

Ronald L Andrus

Joseph M Whalen

Clinton Damon Osterhout

Chukwuemeka Benneth Onuh

Tiffany L James

Claude E Lacy

Kintu O Early

Gregory Gerard Gausman

Hazel B Matthews

Disclosed is an optical fiber having a core with an alkali metal oxide dopant in an peak amount greater than about 0.002 wt. % and less than about 0.1 wt. %. The alkali metal oxide concentration varies with a radius of the optical fiber. By appropriately selecting the concentration of alkali metal oxide dopant in the core and the cladding, a low loss optical fiber may be obtained. Also disclosed are several methods of making the optical fiber including the steps of forming an alkali metal oxide-doped rod, and adding additional glass to form a draw perform. Preferably, the draw preform has a final outer dimension (d), wherein an outer dimension (d) of the rod is less than or equal to 0.06 times the final outer dimension (d). In a preferred embodiment, the alkali metal oxide-doped rod is inserted into the centerline hole of a preform to form an assembly.

Optical fiber containing an alkali metal oxide and methods and apparatus for manufacturing same

Disclosed is an optical fiber having a core with an alkali metal oxide dopant in an peak amount greater than about 0.002 wt. % and less than about 0.1 wt. %. The alkali metal oxide concentration varies with a radius of the optical fiber. By appropriately selecting the concentration of alkali metal oxide dopant in the core and the cladding, a low loss optical fiber may be obtained. Also disclosed are several methods of making the optical fiber including the steps of forming an alkali metal oxide-doped rod, and adding additional glass to form a draw perform. Preferably, the draw preform has a final outer dimension (d2), wherein an outer dimension (d1) of the rod is less than or equal to 0.06 times the final outer dimension (d2). In a preferred embodiment, the alkali metal oxide-doped rod is inserted into the centerline hole of a preform to form an assembly.

Planar waveguides having quantum dots and methods of manufacture of the planar waveguide are described.

Optical waveguides containing quantum dot guiding layers and methods of manufacture

An optical fiber is disclosed in which the core region of the optical fiber is doped with Cl and F in order to reduce the viscosity mismatch between the core region and the adjacent cladding region. In one embodiment of the invention, the optical fiber is a single-mode step index optical fiber having a core region doped with Cl and F in an amount effective to produce a difference in temperature between the glass transition temperature of the core region and the glass transition temperature of the adjacent cladding region of less than about 200&#xb0; C.

Optical fiber having reduced viscosity mismatch

The invention includes inventive methods of treating a soot preform. One method includes heating a soot preform to a temperature of less than about 1000&deg; C. and exposing the preform to a substantially halide free reducing agent. Preferred reducing agents include carbon monoxide and sulfur dioxide. Another inventive method of treating the preform includes exposing the preform, in a furnace, to a substantially non-chlorine containing atmosphere comprising carbon monoxide. The preform is heated to a temperature of at least about 1000&deg; C. Preferably this method is incorporated into the process for making an optical fiber. An additional method of treating the preform includes doping the preform with fluorine and exposing the fluorine doped preform to a substantially chlorine free atmosphere comprising at least carbon monoxide at a temperature of at least 1100&deg; C., thereby reacting excess oxygen present in the furnace.

Treating an optical fiber preform with carbon monoxide

Glasses in the Ca&mdash;Al&mdash;Si system are useful in forming optical components for use in telecommunication systems. The glasses include, in mole percent: SiO present in an amount of about 6 to about 60 percent, Ga O , Al O , or a combination thereof present in an amount of about 12 to about 31 percent, and CaO present in an amount of about 20 to about 65 percent.

Ca-Al-Si oxide glasses and optical components containing the same

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Davis, CA, United States of America

Sabyasachi Sen