David J Digiovanni, 6541 Lookout Rd, Mountain Lakes, NJ 07046

6363194, Mar 26, 2002

Apr 8, 1999

09/288201

David John DiGiovanni - Montclair NJ
Karsten Rottwitt - Basking Ridge NJ

Lucent Technologies Inc. - Murray Hill NJ

G02B 602

385123, 385126, 385127, 359154, 359173, 3593411

In accordance with the invention, an optical fiber communication system comprises one or more Nd doped fiber amplifiers for amplified transmission in the 1400 nm window. The amplifier is designed with a combination of waveguide effects and selective absorption to reduce amplified spontaneous emission to acceptable levels.

6381045, Apr 30, 2002

Jun 24, 1998

09/103925

David John DiGiovanni - Montclair NJ
Bernard Raymond Eichenbaum - Basking Ridge NJ
Mujibun Nisa Khan - Holmdel NJ

Lucent Technologies Inc. - Murray Hill NJ

H04J 1402

359114, 359116, 359173, 385127

Dual concentric core fiber is used for optical communication. Inbound messages lying in a first wavelength channel are received from a terminal portion of the fiber, and outbound messages lying in a second such channel are injected into the terminal portion. The optical fiber has at least one annular portion surrounding a central core portion. The inbound messages are received from the annular portion, and the outbound messages are injected into the central core portion. Alternatively, the inbound messages are received from the central core portion, and the outbound messages are injected into the annular portion.

6389186, May 14, 2002

Apr 30, 1999

09/303383

David John DiGiovanni - Montclair NJ
Jane Deborah LeGrange - Princeton NJ

Lucent Technologies Inc. - Murray Hill NJ

G02B 600

385 12, 385 39, 385 48, 372 6

In accordance with the invention, a pumped waveguide device comprising a pump waveguide and an active waveguide is provided with a pump power monitor by disposing between the pump source and the active waveguide, an indicator waveguide having a core doped with a material sensitive to the pump light. For example the material can fluoresce in response to pump light or absorb pump light and generate heat. Pump power is then accurately measured by the fluorescence or heat from the indicator waveguide. Since the fluorescence or heat is generated in the doped core, the measurement is sensitive to the pump power that will enter the active waveguide and is relatively insensitive to changes in mode distribution. Exemplary embodiments include monitored cladding pumped fiber lasers, amplifiers and light sources.

6397636, Jun 4, 2002

May 20, 1999

09/315631

David John DiGiovanni - Montclair NJ
Mikhail Fishteyn - Bridgewater NJ

Lucent Technologies Inc. - Murray Hill NJ

C03B 37028

65395, 65408, 65410, 65411, 65 43

Optical fiber bundles having high optical throughput can be produced with relatively high yield if gaps between fibers are eliminated by application of a particle-containing glass precursor material, exemplarily fumed silica in an aqueous medium. Manufacture of optical fiber bundles that comprise two or more fibers that each comprise a substantially planar surface (with the planar surfaces facing each other) is improved by application of a particle-free glass precursor material, e. g. , partially hydrolysed tetramethyl orthosilicate, to the fiber bundle. After drying of the applied glass precursor material the fiber bundle is heated to fuse the fibers together.

6422043, Jul 23, 2002

Nov 16, 1999

09/440763

David John DiGiovanni - Montclair NJ
Steven Eugene Golowich - New Providence NJ
Sean L. Jones - Clarkston GA
William Alfred Reed - Summit NJ

Fitel USA Corp.

C03B 37075

65402, 65403

Our method of making high bandwidth silica-based multimode optical fiber comprises provision of a non-circular preform, and drawing fiber of chiral structure from the preform. The non-circular preform can be made by maintaining the inside of the tubular preform under reduced pressure during at least part of the collapse, resulting in a non-circular core and cladding. It can also be made by removal (e. g. , by grinding or plasma etching) of appropriate portions of the preform, resulting in a circular core and non-circular cladding. In the latter case, fiber is drawn at a relatively high temperature such that, due to surface tension, the cladding assumes substantially circular shape and the core assumes a non-circular shape. The chiral structure is imposed on the fiber in any appropriate way, e. g. , by twisting during fiber drawing the fiber alternately in clockwise and couterclockwise sense relative to the preform.

6434172, Aug 13, 2002

Aug 6, 1999

09/369393

David John DiGiovanni - Montclair NJ
Daryl Inniss - Alpharetta GA
Ralph Stephen Jameson - Allentown PA
Sandra Greenberg Kosinski - Murray Hill NJ

Fitel USA Corp.

H01S 330

372 6, 372 3, 372 92, 372102, 385 37

The disclosed fiber Raman device comprises means for coupling pump radiation of a first wavelength and a second wavelength into a length of silica-based fiber, with being different from , and with both of and being less than an output radiation of the fiber Raman device. The Raman device further comprises at least a first and a second wavelength-selective element disposed to provide one or more optical cavities for Raman shifting of light in the fiber. At least one of the optical cavities is selected such that at least one of and is off resonance. Exemplarily, the Raman device is a topologically linear or circular Raman laser or amplifier, and the wavelength selective element is a fiber Bragg grating or a WDM. The Raman device is advantageously used in an optical fiber communication system.

6504973, Jan 7, 2003

Mar 16, 2002

10/099820

David J. DiGiovanni - Montclair NJ
William Alfred Reed - Summit NJ
Jeffrey W. Nicholson - Chatham NJ
Man Fei Yan - Berkeley Heights NJ
Bera Palsdottir - Copenhagen, DK

Fitel USA Corp. - Norcross GA

G02B 626

385 27, 385123, 359160, 359334, 372 6

A Raman amplified dispersion compensation module has a first dispersion compensating fiber (DCF) with an input end and an output end. The first DCF has a known Raman gain coefficient (g ()), Raman effective fiber area (A ), and dispersion characteristic. An input end of a second DCF is arranged to receive light signals from the output end of the first DCF. The second DCF has a known gain coefficient and effective area, and a dispersion characteristic selected to cooperate with that of the first DCF to produce a desired total module dispersion. The lengths of the DCFs are selected in a manner that optimizes the overall module gain.

6513994, Feb 4, 2003

Apr 28, 2000

09/561035

David John DiGiovanni - Montclair NJ
John Edwin Graebner - Short Hills NJ
Sun-Young John Kwak - Fort Lee NJ

Fitel USA Corp. - Norcross GA

G02B 6255

385 95, 385 52, 356 731

The specification describes a technique for evaluating optical fiber splices. The essence of the technique involves detecting thermal power emanating from the fiber splice as the result of absorption of the light carried by the fiber. The technique is particularly suited for cladding pumped lasers wherein the splicing operation may introduce excessive absorption of pump laser radiation and excessive heating at the splice locale.