Robert S Hawk

US Patent:

6550283, Apr 22, 2003

Filed:

Oct 2, 2001

Appl. No.:

09/970299

Inventors:

Paul E. Blaszyk - Horseheads NY
William R. Christoff - Elmira NY
Daniel E. Gallagher - Big Flats NY
Robert M. Hawk - Pawleys Island SC
William J. Kiefer - Horseheads NY

Assignee:

Corning Incorporated - Corning NY

International Classification:

C03B 37075

US Classification:

65402, 65438, 264 124

Abstract:

Optical fiber is provided with a periodically reversing spin while the fiber is pulled through a melt zone. A cooled region of the fiber downstream from the melt zone passes between a pair of opposed elements. The opposed elements are moved so that surface regions engaging the fiber move in opposite lateral directions relative to one another, thus spinning the fiber about its axis. The lateral movement of the engaged surface portions is periodically reversed to reverse the spin direction. The opposed elements may include belts or rollers, which can be tilted to orientations oblique to the longitudinal direction of the fiber.

US Patent:

50677896, Nov 26, 1991

Filed:

Feb 14, 1991

Appl. No.:

7/655726

Inventors:

Douglas W. Hall - Corning NY
Robert M. Hawk - Bath NY

Assignee:

Corning Incorporated - Corning NY

International Classification:

G02B 626
G02B 642

US Classification:

385 27

Abstract:

The disclosed fiber optic filter structure includes an optical fiber having a single-mode core surrounded by cladding material, and at least one light-attenuating light path in the cladding material uniformly spaced from the single-mode core. The propagation constants of the single-mode core and the light path are different at wavelengths except for at least one wavelength. lambda. sub. 4. The spacing between the single-mode core and the light path are sufficiently small that light within a first band of wavelengths centered around. lambda. sub. f couples between the single-mode core and the light path. At least a portion of the light within the first band of wavelengths is absorbed in the light path. In that embodiment in which the single-mode core is a fiber amplifier gain core, the filtering function of the light path modifies the fiber amplifier gain spectrum.

US Patent:

51493497, Sep 22, 1992

Filed:

Jul 11, 1991

Appl. No.:

7/728276

Inventors:

George E. Berkey - Pine City NY
Robert M. Hawk - Bath NY
Steven H. Tarcza - Painted Post NY

Assignee:

Corning Incorporated - Corning NY

International Classification:

C03B 37023

US Classification:

65 311

Abstract:

Disclosed is a method of making a polarization retaining single-mode optical fiber. There is initially formed a draw blank having diametrically opposed longitudinal apertures in the cladding glass parallel to the core glass region. The draw blank is drawn into a fiber under such conditions that the apertures close as the fiber is being drawn. The flow of surrounding glass, including the core glass region, toward the collapsing apertures, causes the core to assume an elliptical shape. The apertures are of such cross-sectional area and spacing from the core that the core develops the desired aspect ratio.

US Patent:

63248727, Dec 4, 2001

Filed:

Apr 11, 1997

Appl. No.:

8/838836

Inventors:

Paul E. Blaszyk - Horseheads NY
William R. Christoff - Elmira NY
Daniel E. Gallagher - Big Flats NY
Robert M. Hawk - Pawleys Island SC
William J. Kiefer - Horseheads NY

Assignee:

Corning Incorporated - Corning NY

International Classification:

C03B 37075
D01H 111

US Classification:

65504

Abstract:

Optical fiber is provided with a periodically reversing spin while the fiber is pulled through a melt zone. A cooled region of the fiber downstream from the melt zone passes between a pair of opposed elements. The opposed elements are moved so that surface regions engaging the fiber move in opposite lateral directions relative to one another, thus spinning the fiber about its axis. The lateral movement of the engaged surface portions is periodically reversed to reverse the spin direction. The opposed elements may include belts or rollers, which can be tilted to orientations oblique to the longitudinal direction of the fiber.

US Patent:

51528185, Oct 6, 1992

Filed:

Nov 9, 1990

Appl. No.:

7/612103

Inventors:

George E. Berkey - Pine City NY
Venkata A. Bhagavatula - Big Flats NY
Robert M. Hawk - Bath NY
Steven H. Tarcza - Painted Post NY

Assignee:

Corning Incorporated - Corning NY

International Classification:

C03C 2502

US Classification:

65 311

Abstract:

Disclosed is a method of making a polarization retaining single-mode optical fiber. Longitudinal grooves are formed on opposite sides of a cylindrically-shaped core perform having a glass core surrounded by cladding glass. The core preform is inserted into a glass tube, the tube is shrunk onto the core preform, and the interface between the core preform and the tube is fused to form a solid preform having longitudinal apertures on opposite sides of the core. An etchant gas is flowed through the apertures to enlarge the apertures into holes having a substantially round cross-section. Inserted into each aperture is a stress rod formed of glass having a coefficient of expansion different from that of the cladding glass. The resultant draw blank is drawn to form a single-mode optical fiber having a core that is subjected to a stress-induced birefringence.

US Patent:

49327402, Jun 12, 1990

Filed:

Jun 5, 1989

Appl. No.:

7/361383

Inventors:

George E. Berkey - Pine City NY
Robert M. Hawk - Bath NY

Assignee:

Corning Incorporated - Corning NY

International Classification:

G02B 626

US Classification:

350 9615

Abstract:

A method of making a polarization retaining single-mode (PRSM) optical fiber coupler. A section of coating is stripped from the central portion of two PRSM optical fibers. The fibers extend through the bore of a glass tube, the stripped portions being centered in the tube, and the coating portions extending into the ends of the bore. In one embodiment, each fiber is provided with a rectangularly shaped coating, and the two larger flattened sides of the coating are specifically oriented with respect to the major and minor axes of the PRSM fiber therein. The fiber coating can be disposed in only one orientation in the rectangularly-shaped tube bore, thereby properly orienting the two PRSM fibers with respect to each other. In another embodiment, the PRSM fibers are disposed within a single coating, the azimuthal inhomogenity of one fiber being aligned in the coating with respect to that of the remaining fibers. In both embodiments, the fiber coating material is utilized to facilitate the alignment of the major axes of the fibers.

US Patent:

49500473, Aug 21, 1990

Filed:

Jun 5, 1989

Appl. No.:

7/361385

Inventors:

George E. Berkey - Pine City NY
Robert M. Hawk - Bath NY

Assignee:

Corning Incorporated - Corning NY

International Classification:

G02B 644

US Classification:

350 9623

Abstract:

This invention relates to a method of drawing twist-free optical fibers; it is particularly useful for drawing polarization retaining single-mode optical fibers having azimuthal inhomogeneities. There is applied to the fiber, during the drawing thereof, a coating having a non-circular cross-section, the azimuthal inhomogeneity of the fiber being positioned in a substantially constant orientation with respect to the non-circular cross-section of the coating. In another embodiment, a plurality of fibers having azimuthal inhomogeneities are drawn from a plurality of preforms that are properly oriented in the draw furnace. The fibers are drawn through the same coater so that the azimuthal inhomogeneity of each fiber is oriented in a substantially constant relationship with respect to the azimuthal inhomogeneities of the remaining fibers in the coating.