Pablo C Pureza

US Patent:

6526782, Mar 4, 2003

Filed:

Sep 28, 2001

Appl. No.:

09/964548

Inventors:

Reza Mossadegh - Alexandria VA
Brian Cole - Arlington VA
Pablo Pureza - Burke VA
Jasbinder Sanghera - Ashburn VA
Shyam Bayya - Ashburn VA
Ishwar Aggarwal - Fairfax Station VA

Assignee:

The United States of America as represented by the Secretary of the Navy - Washington DC

International Classification:

C03B 37022

US Classification:

65488, 65405, 65502, 65495, 65484, 65384

Abstract:

This invention pertains to apparatus and process for making core/clad glass fibers. The apparatus includes a central tube or receptacle connected at the top to a pressure controller and terminating in a reduced section; a side tube or receptacle positioned at about the level of the upper portion of the central tube; an outer tube or receptacle disposed around the bottom portion of the central tube terminating in a smaller section which is concentric with and spaced directly below the section of the central tube; a side arm connecting the side tube and the outer tube; and furnaces around the side, outer, and the reduced sections of the central and the outer tubes. The process includes the steps of disposing a solid core glass rod at a point removed from hot temperature that can cause crystallization in the core glass rod, disposing a solid clad glass rod at a point removed from the core glass rod, softening to the flowing condition the solid clad glass rod, transferring the softened clad glass to a lower point, the softened clad glass having a central void therethrough, heating the softened clad glass above its crystallization temperature, cooling the softened clad glass to a draw temperature, transferring the solid core glass rod into the central void in the softened clad glass, softening to the flowing condition the solid core glass rod with the heat from the softened and cooled clad glass, and drawing the core/clad glass fiber by allowing the clad and core glasses to flow in the form of a fiber.

US Patent:

6993230, Jan 31, 2006

Filed:

Aug 1, 2003

Appl. No.:

10/632210

Inventors:

Jasbinder Sanghera - Ashburn VA, US
Ishwar Aggarwal - Fairfax Station VA, US
Leslie B. Shaw - Woodbridge VA, US
Pablo C. Pureza - Burke VA, US
Fred Kung - Alexandria VA, US
Brian Cole - Alexandria VA, US

Assignee:

The United States of America as represented by the Secretary of the Navy - Washington DC

International Classification:

G02B 6/02

US Classification:

385125, 385123, 385122, 385141

Abstract:

This invention pertains to a hollow core photonic band gap chalcogenide optical glass fiber and to a fabrication method for making the fiber. The fiber, which is 80-1000 microns in outside diameter, is characterized by a solid glass circumferential region and a structured region disposed centrally within the solid region, the structured region includes a hollow core of 1 micron to several hundreds of microns in diameter surrounded by a plurality of parallel hollow capillaries extending parallel to the core, the core being centrally and longitudinally located within the fiber. Ratio of open space to glass in the structured region is 30-99%. The fabrication method includes the steps of providing a mold, placing chalcogenide micro-tubes around the mold, stacking chalcogenide micro-canes around the stacked micro-tubes, fusing the micro-tubes and the micro-canes to form a preform, removing the mold and drawing the preform to obtain the fiber. In an alternative fabrication method, the fiber is made by extruding flowing chalcogenide glass through suitably made plate to form a preform and then drawing the preform to form the fiber.

US Patent:

7197899, Apr 3, 2007

Filed:

Jan 6, 2003

Appl. No.:

10/339255

Inventors:

Reza Mossadegh - Alexandria VA, US
Brian Cole - Arlington VA, US
Pablo Pureza - Burke VA, US
Jasbinder Sanghera - Ashburn VA, US
Shyam Bayya - Ashburn VA, US
Ishwar Aggarwal - Fairfax Station VA, US

Assignee:

United States of America as represented by the Secretary of the Navy - Washington DC

International Classification:

C03B 37/075

US Classification:

65389, 65404, 65405, 65502

Abstract:

A process includes the steps of disposing a solid core glass rod at a point removed from hot temperature that can cause crystallization in the core glass rod, disposing a solid clad glass rod at a point removed from the core glass rod; softening to the flowing condition the solid clad glass rod, transferring the softened clad glass to a lower point, the softened clad glass having a central void therethrough, heating the softened clad glass above its crystallization temperature, cooling the softened clad glass to a draw temperature, transferring the solid core glass rod into the central void in the softened glad glass, softening to the flowing condition the solid core glass rod with the heat from the softened and cooled clad glass, and drawing the core/clad, glass fiber by allowing the clad and core glasses to flow in the form of a fiber.

US Patent:

7295740, Nov 13, 2007

Filed:

Jan 16, 2007

Appl. No.:

11/623359

Inventors:

Jasbinder S Sanghera - Ashburn VA, US
Pablo C Pureza - Burke VA, US
Frederic H Kung - Alexandria VA, US
Daniel Gibson - Greenbelt MD, US
Leslie Brandon Shaw - Woodbridge VA, US
Ishwar D Aggarwal - Farifax Station VA, US

Assignee:

The United States of America as represented by the Secretary of the Navy - Washington DC

International Classification:

G02B 6/02

US Classification:

385125, 385123, 385122, 385141

Abstract:

A photonic band gap fiber and method of making thereof is provided. The fiber is made of a non-silica-based glass and has a longitudinal central opening, a microstructured region having a plurality of longitudinal surrounding openings, and a jacket. The air fill fraction of the microstructured region is at least about 40%. The fiber may be made by drawing a preform into a fiber, while applying gas pressure to the microstructured region. The air fill fraction of the microstructured region is changed during the drawing.

US Patent:

8571371, Oct 29, 2013

Filed:

Jun 15, 2011

Appl. No.:

13/160760

Inventors:

Daniel J. Gibson - Cheverly MD, US
Jasbinder S. Sanghera - Ashburn VA, US
Frederic H. Kung - Alexandria VA, US
Pablo C Pureza - Burke VA, US
Robert E Miklos - La Plata MD, US
Guillermo R. Villalobos - Springfield VA, US
Leslie Brandon Shaw - Woodbridge VA, US
Ishwar D. Aggarwal - Charlotte NC, US

Assignee:

The United States of America as represented by the Secretary of the Navy - Washington DC

International Classification:

G02B 6/032

US Classification:

385125

Abstract:

A method and apparatus for making a substantially void-free preform for a microstructured optical fiber using a one-step process is provided. A preform is prepared from specialty glasses using a direct extrusion method. A die for use with the direct extrusion method is also provided, and a method for drawing the preform into a HC-PBG fiber for use in transmitting infra-red wavelength light is also provided. The preform comprises an outer jacket made of solid glass, a cladding having a plurality of air holes arranged in a desired pattern within the jacket, and a core which is hollow.

US Patent:

20050074215, Apr 7, 2005

Filed:

Oct 21, 2004

Appl. No.:

10/904062

Inventors:

Jasbinder Sanghera - Ashburn VA, US
Pablo Pureza - Burke VA, US
Frederic Kung - Alexandria VA, US
Daniel Gibson - Greenbelt MD, US
Leslie Shaw - Woodbridge VA, US
Ishwar Aggarwal - Fairfax Station VA, US

Assignee:

United States of America as represented by the Secretary of the Navy - Arlington VA

International Classification:

G02B006/20

US Classification:

385125000, 065388000, 065389000, 065393000

Abstract:

A photonic band gap fiber and method of making thereof is provided. The fiber is made of a non-silica-based glass and has a longitudinal central opening, a microstructured region having a plurality of longitudinal surrounding openings, and a jacket. The air fill fraction of the microstructured region is at least about 40%. The fiber may be made by drawing a preform into a fiber, while applying gas pressure to the microstructured region. The air fill fraction of the microstructured region is changed during the drawing.

US Patent:

20080060387, Mar 13, 2008

Filed:

Nov 5, 2007

Appl. No.:

11/934946

Inventors:

Jasbinder Sanghera - Ashburn VA, US
Pablo Pureza - Burke VA, US
Frederic Kung - Alexandria VA, US
Daniel Gibson - Greenbelt MD, US
Leslie Shaw - Woodbridge VA, US
Ishwar Aggarwal - Fairfax Station VA, US

International Classification:

C03B 37/027

US Classification:

065393000

Abstract:

A photonic band gap fiber and method of making thereof is provided. The fiber is made of a non-silica-based glass and has a longitudinal central opening, a microstructured region having a plurality of longitudinal surrounding openings, and a jacket. The air fill fraction of the microstructured region is at least about 40%. The fiber may be made by drawing a preform into a fiber, while applying gas pressure to the microstructured region. The air fill fraction of the microstructured region is changed during the drawing.

US Patent:

60216492, Feb 8, 2000

Filed:

Feb 24, 1999

Appl. No.:

9/256231

Inventors:

Jasbinder S. Sanghera - Greenbelt MD
Pablo Pureza - Burke VA
Ishwar D. Aggarwal - Fairfax Station VA
Reza Mossadegh - Alexandria VA

Assignee:

The United States of America as Represented by the Secretary of the Navy - Washington DC

International Classification:

C03B 37023

US Classification:

65495

Abstract:

A core/clad glass optical fiber is made by melting a core glass rod and a adding glass rod in separate crucibles which are not concentric with respect to each other and the respective core and cladding glass melts passed out of contact with each other to a glass melt contacting zone proximate a fiber drawing orifice in which the cladding glass surrounds the core glass and a core/clad glass fiber is drawn. This process enables the clad glass fiber to be drawn directly from core and cladding glass rods without the need for a preform or forming a melt from glass chards or chunks, thereby reducing the cost of producing the fiber and also producing a glass clad optical fiber of high purity and excellent concentricity. Chalcogenide glass fibers having a concentricity of 100% have been made.