Patents Represented by Attorney, Agent or Law Firm George S. Indig
  • Patent number: 6386002
    Abstract: A silica-water dispersion suitable for use as a sol for sol-gel fabrication is produced from a silica-water mixture with addition of alkaline agent. The agent functions to increase viscosity so as to improve dispersing efficiency during shear mixing.
    Type: Grant
    Filed: November 17, 1997
    Date of Patent: May 14, 2002
    Assignee: Fitel USA Corporation
    Inventors: Suhas Dattatreya Bhandarkar, David Wilfred Johnson, Jr., John Burnette MacChesney, Thomas Edward Stockert
  • Patent number: 6191877
    Abstract: Pump depletion modulation crosstalk between WDM channels in Raman amplified systems is virtually eliminated by exclusive use of backward pumping.
    Type: Grant
    Filed: July 15, 1996
    Date of Patent: February 20, 2001
    Assignee: Lucent Technologies Inc.
    Inventors: Andrew R. Chraplyvy, Fabrizio Forghieri, Robert William Tkach
  • Patent number: 6165648
    Abstract: A thick holographic recording medium suitable for use in multiplex holography is prepared from a solution of a bi-functional oligomer and a mono-functional monomer. Precuring, possibly at the same radiation wavelength used for recording, cross-links the oligomer, thereby creating a host for the recording monomer.
    Type: Grant
    Filed: September 18, 1998
    Date of Patent: December 26, 2000
    Assignee: Lucent Technologies Inc.
    Inventors: Vicki L. Colvin, Alexander Lowe Harris, Howard Edan Katz, Marcia Lea Schilling
  • Patent number: 6011892
    Abstract: A fiber suitable for use in high capacity optical fiber network operative with wavelength division multiplexing. Contemplated systems can utilize span distances in excess of 100 km, signal amplification within spans, and provide plural multiplexed channels operative at multiple gigabits per second.
    Type: Grant
    Filed: July 16, 1998
    Date of Patent: January 4, 2000
    Assignee: Lucent Technologies Inc.
    Inventors: Andrew R. Chraplyvy, Robert William Tkach
  • Patent number: 5966491
    Abstract: A cladding-pumped fiber structure, suitable for use as a laser, provides for efficient clad-to-core energy transfer. The outside interface of the pump-clad is constructed from a rod-shaped preform by local melt-displacement using an open flame.
    Type: Grant
    Filed: May 15, 1997
    Date of Patent: October 12, 1999
    Assignee: Lucent Technologies Incorporated
    Inventor: David John DiGiovanni
  • Patent number: 5943145
    Abstract: Selection of individual holograms during read-out of a multiplexed array depends upon varying relative position of the recording medium in the direction orthogonal to the medium surface.
    Type: Grant
    Filed: May 5, 1995
    Date of Patent: August 24, 1999
    Assignee: Lucent Technologies Inc.
    Inventors: Kevin Curtis, William Larry Wilson
  • Patent number: 5914437
    Abstract: Cracking in thin sheets of sol-gel-produced material is avoided by use of a support liquid during gelation and drying. Silica glass, as well as other glass and ceramic bodies, is contemplated.
    Type: Grant
    Filed: June 23, 1997
    Date of Patent: June 22, 1999
    Assignee: Lucent Technologies Incorporated
    Inventors: Edwin Arthur Chandross, David Wilfred Johnson, Jr., John Burnette MacChesney, Eliezer M. Rabinovich, John Thomson, Jr.
  • Patent number: 5905838
    Abstract: Simultaneous dense WDM operation in both the 1310 nm and 1550 nm transparency windows of silica-based optical fiber, is enabled by a fiber design providing for nulled dispersion within a critically positioned wavelength range. Design provides for values of dispersion in both windows sufficiently low for desired per-channel bit rate, and, at the same time, sufficiently high to maintain effects of non-linear dispersion within tolerable limits for WDM operation. Fiber fabrication and system design are described.
    Type: Grant
    Filed: February 18, 1998
    Date of Patent: May 18, 1999
    Assignee: Lucent Technologies Inc.
    Inventors: Arthur F. Judy, David Kalish, Raymond Bradfield Kummer, David Wayne Peckham, William Alfred Reed
  • Patent number: 5892601
    Abstract: Use of an aperture in the reconstructed beam in reconstruction of multiple holograms increases selectivity beyond that realizable by spatial multiplexing so as to permit differentiation of overlapping images. "Aperturization" is suitably used for differentiation in the y-direction in shift holography, depending on Bragg selection in the x-direction.
    Type: Grant
    Filed: July 3, 1997
    Date of Patent: April 6, 1999
    Assignee: Lucent Technologies Incorporated
    Inventors: Kevin Curtis, William Larry Wilson
  • Patent number: 5887093
    Abstract: A module, for upgrading optical fiber systems, includes an appropriate length of Dispersion Compensating Fiber (DCF) for nulling chromatic dispersion, together with a pump, which uses Stimulated Raman Scattering for amplifying signal in the DCF, thereby compensating for power loss associated with the DCF.
    Type: Grant
    Filed: September 12, 1997
    Date of Patent: March 23, 1999
    Assignee: Lucent Technologies Incorporated
    Inventors: Per Bang Hansen, Gloria Regina Jacobovitz-Veselka
  • Patent number: 5873923
    Abstract: A cladding-pumped fiber structure, suitable for use as a laser, provides for efficient clad-to-core energy transfer. The outside interface of the pump-clad is constructed from a rod-shaped preform by local melt-displacement using an open flame.
    Type: Grant
    Filed: October 27, 1997
    Date of Patent: February 23, 1999
    Assignee: Lucent Technologies Incorporated
    Inventor: David John DiGiovanni
  • Patent number: 5874187
    Abstract: A thick holographic recording medium suitable for use in multiplex holography is prepared from a solution of a bi-functional oligomer and a mono-functional monomer. Precuring, possibly at the same radiation wavelength used for recording, cross-links the oligomer, thereby creating a host for the recording monomer.
    Type: Grant
    Filed: August 15, 1996
    Date of Patent: February 23, 1999
    Assignee: Lucent Technologies Incorporated
    Inventors: Vicki L. Colvin, Alexander Lowe Harris, Howard Edan Katz, Marcia Lea Schilling
  • Patent number: 5847862
    Abstract: A significant part of signal-to-noise degradation in WDM optical fiber communications, due to Raman crosstalk, is found to be deterministic in nature. Shaping of amplifier output to offset depletion of high frequency channels improves signal capacity by an order of magnitude.
    Type: Grant
    Filed: November 29, 1997
    Date of Patent: December 8, 1998
    Assignee: Lucent Technologies Incorporated
    Inventors: Andrew R. Chraplyvy, Fabrizio Forghieri, Robert William Tkach
  • Patent number: 5831761
    Abstract: A high capacity optical fiber network operative with wavelength division multiplexing. Contemplated systems can utilize span distances in excess of 100 km, signal amplification within spans, and provide plural multiplexed channels operative at multiple gigabits per second.
    Type: Grant
    Filed: May 23, 1997
    Date of Patent: November 3, 1998
    Assignee: Lucent Technologies Incorporated
    Inventors: Andrew R. Chraplyvy, Robert William Tkach
  • Patent number: 5812288
    Abstract: Bit error rate in holographic storage/reconstruction is reduced by 2-dimensionally dispersing symbols constituting codewords so that no two codeword-common symbols occupy a single row or column on the SLM display.
    Type: Grant
    Filed: December 27, 1995
    Date of Patent: September 22, 1998
    Assignee: Lucent Technologies Inc.
    Inventors: Kevin Curtis, Clifford Eric Martin, Thomas J. Richardson, Michael C. Tackitt, Peter M. Winkler
  • Patent number: 5808998
    Abstract: Bit error rate of an output data stream, reconstructed from a holographic recording, is reduced by reducing the length of same-state pixels on the spatial light modulator.
    Type: Grant
    Filed: December 27, 1995
    Date of Patent: September 15, 1998
    Assignee: Lucent Technologies Inc
    Inventors: Kevin Curtis, Clifford Eric Martin, Thomas J. Richardson, Michael C. Tackitt, Peter M. Winkler
  • Patent number: 5703705
    Abstract: A system for high density holographic storage announced by Cal Tech is improved. The basic Cal Tech system records successive holograms by physically shifting the recording medium relative to the paired reference and signal beams. By depending on Bragg selectivity, successive holograms may be overlapped and still differentiated in the direction of overlap--in the "x-direction". The claimed system improves storage density by tilting the holographic plane to introduce a Bragg component in the y-direction, thereby enabling differentiation of overlapping holograms in that direction as well.
    Type: Grant
    Filed: May 5, 1995
    Date of Patent: December 30, 1997
    Assignee: Lucent Technologies Inc.
    Inventors: Kevin Curtis, William Larry Wilson
  • Patent number: 5633741
    Abstract: WDM optical fiber communications entails bidirectional transmission with at least two WDM channels in opposite transmission directions in a single fiber. As compared with unidirectional transmission, a number of capacity-limiting considerations are relaxed. Operation using in-ground dispersion-shifted fiber permits system capacities of conventional unidirectional WDM.
    Type: Grant
    Filed: February 23, 1995
    Date of Patent: May 27, 1997
    Assignee: Lucent Technologies Inc.
    Inventor: Clinton R. Giles
  • Patent number: 5623566
    Abstract: 1.times.2 and more complex switching operations use routing corresponding with guides produced by heating with a laterally-homogeneous layer. Strip heaters, in contact with a silica-based sandwich structure, thermally increase refractive index to define laterally-constrained cores within the center layer.
    Type: Grant
    Filed: May 19, 1995
    Date of Patent: April 22, 1997
    Assignee: Lucent Technologies Inc.
    Inventors: Hyung J. Lee, Weyl-kuo Wang
  • Patent number: 5596413
    Abstract: Through-the-lens alignment during deep UV lithographic processing in the manufacture of VLSI is accomplished without shifting the mask or wafer from the exposure position. Introduction and extraction of alignment light of actinic wavelength depends on beam routing due to diffraction from an interference grating. The path of alignment light is within the focusing system but does not impinge on the focused pattern.
    Type: Grant
    Filed: August 17, 1995
    Date of Patent: January 21, 1997
    Assignee: Lucent Technologies Inc.
    Inventors: Stuart Stanton, Donald L. White, George G. Zipfel, Jr.