Patents by Inventor Robert D. Feldman

Robert D. Feldman has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Patent number: 7957643
    Abstract: A method and apparatus for controlling the power level of an optical signal includes detecting the loss of a supervisory signal counter-propagating in an optical fiber.
    Type: Grant
    Filed: March 7, 2002
    Date of Patent: June 7, 2011
    Assignee: Alcatel-Lucent USA Inc.
    Inventors: Robert D. Feldman, Janet M. Greenberg, Mile Radovanovic, Singanallur R. Thangavelu, William A. Thompson
  • Patent number: 7822341
    Abstract: In one embodiment, a control method, according to which a cascade of control messages is propagated between nodes of an optically transparent network, with each message being sent from a node to an adjacent downstream node to inform the latter about a control operation scheduled to be performed at the message-sending node and/or an upstream node that impacts an optical communication signal received at that downstream node. The cascade of control messages effectively creates an ad hoc control domain, in which control operations performed at various nodes of that domain can be coordinated to reduce unfavorable interactions between those control operations. By repeatedly propagating appropriate cascades of control messages through the network, control domains can be changed dynamically and adaptively to reflect any changes to the network topology, equipment, and/or traffic distribution.
    Type: Grant
    Filed: September 28, 2006
    Date of Patent: October 26, 2010
    Assignee: Alcatel-Lucent USA Inc.
    Inventors: Robert D. Feldman, Daniel C. Kilper, Thomas A. Skrobala, Christopher A. White, Lili Yu
  • Publication number: 20080080858
    Abstract: In one embodiment, a control method, according to which a cascade of control messages is propagated between nodes of an optically transparent network, with each message being sent from a node to an adjacent downstream node to inform the latter about a control operation scheduled to be performed at the message-sending node and/or an upstream node that impacts an optical communication signal received at that downstream node. The cascade of control messages effectively creates an ad hoc control domain, in which control operations performed at various nodes of that domain can be coordinated to reduce unfavorable interactions between those control operations. By repeatedly propagating appropriate cascades of control messages through the network, control domains can be changed dynamically and adaptively to reflect any changes to the network topology, equipment, and/or traffic distribution.
    Type: Application
    Filed: September 28, 2006
    Publication date: April 3, 2008
    Applicant: LUCENT TECHNOLOGIES INC.
    Inventors: Robert D. Feldman, Daniel C. Kilper, Thomas A. Skrobala, Christopher A. White, Lili Yu
  • Patent number: 7161734
    Abstract: A method and apparatus for controlling transients in an optical signal propagating along an optical fiber path interconnecting a plurality of network elements employs a power threshold to determine an appropriate response given a change in optical signal power.
    Type: Grant
    Filed: May 26, 2004
    Date of Patent: January 9, 2007
    Assignee: Lucent Technologies Inc.
    Inventors: Robert D. Feldman, Mahan Movassaghi, David A. Sadler, William A. Thompson
  • Publication number: 20040218258
    Abstract: A method and apparatus for controlling transients in an optical signal propagating along an optical fiber path interconnecting a plurality of network elements employs a power threshold to determine an appropriate response given a change in optical signal power.
    Type: Application
    Filed: May 26, 2004
    Publication date: November 4, 2004
    Inventors: Robert D. Feldman, Mahan Movassaghi, David A. Sadler, William A. Thompson
  • Publication number: 20040208519
    Abstract: A method and apparatus for controlling the power level of an optical signal includes detecting the loss of a supervisory signal counter-propagating in an optical fiber.
    Type: Application
    Filed: March 7, 2002
    Publication date: October 21, 2004
    Applicant: LUCENT TECHNOLOGIES INC.
    Inventors: Robert D. Feldman, Janet M. Greenberg, Mile Radovanovic, S. R. Thangavelu, William A. Thompson
  • Patent number: 6798567
    Abstract: A method and apparatus for controlling transients in an optical signal propagating along an optical fiber path interconnecting a plurality of network elements employs a power threshold to determine an appropriate response given a change in optical signal power.
    Type: Grant
    Filed: March 7, 2002
    Date of Patent: September 28, 2004
    Assignee: Lucent Technologies Inc.
    Inventors: Robert D. Feldman, Mahan Movassaghi, David A. Sadler, William A. Thompson
  • Patent number: 6661946
    Abstract: Optical signal power levels for selected optical channels processed within an add/drop node in a wavelength division multiplexed (WDM) system are adjusted as a function of variations in signal power in an incoming WDM signal caused by gain ripple. In particular, a “ripple fitting” method is described whereby the optical signal power of individual optical channels being added at the add/drop node are adjusted to levels that correspond to the ripple profile of other optical channels being routed through the add/drop node. In this manner, the gain ripple in the WDM signal being output from the add/drop node approximately corresponds to the gain ripple in the incoming WDM signal at the node.
    Type: Grant
    Filed: July 9, 2001
    Date of Patent: December 9, 2003
    Assignee: Lucent Technologies Inc.
    Inventors: Carl A Caroli, Robert D. Feldman, Scott D Young
  • Patent number: 6650840
    Abstract: A method for identifying faults in a branched optical network having a central office optically connected to a plurality of optical network units by a plurality of optical paths. The method involves transmitting an optical signal from the central office to the optical network units reflecting a portion of the transmitted optical signal back to the central office. This reflected signal is then used to determine whether a fault exists in the branched optical network.
    Type: Grant
    Filed: March 26, 1999
    Date of Patent: November 18, 2003
    Assignee: Lucent Technologies Inc.
    Inventor: Robert D. Feldman
  • Publication number: 20030169487
    Abstract: A method and apparatus for controlling transients in an optical signal propagating along an optical fiber path interconnecting a plurality of network elements employs a power threshold to determine an appropriate response given a change in optical signal power.
    Type: Application
    Filed: March 7, 2002
    Publication date: September 11, 2003
    Applicant: LUCENT TECHNOLOGIES INC.
    Inventors: Robert D. Feldman, Mahan Movassaghi, David A. Sadler, William A. Thompson
  • Patent number: 6577414
    Abstract: A passive optical network is provided that integrates signals carrying broadcast CATV services into a FTTH/C network that also provides high-speed Internet access and telephony. Essentially all residential telecommunications services are provided in a single network, based on a single fiber and a single simple transceiver in an optical network unit. Multiple services (e.g., analog video, digital video, cable-modem based Internet access) are multiplexed using separate rf subcarriers (subcarrier multiplexing or SCM) and the delivered signals are compatible with existing consumer appliances (e.g., TVs, VCRs, cable modems, etc.).
    Type: Grant
    Filed: February 19, 1999
    Date of Patent: June 10, 2003
    Assignee: Lucent Technologies Inc.
    Inventors: Robert D. Feldman, John A. Stiles, Gordon C. Wilson, Thomas H. Wood
  • Publication number: 20030007722
    Abstract: Optical signal power levels for selected optical channels processed within an add/drop node in a wavelength division multiplexed (WDM) system are adjusted as a function of variations in signal power in an incoming WDM signal caused by gain ripple. In particular, a “ripple fitting” method is described whereby the optical signal power of individual optical channels being added at the add/drop node are adjusted to levels that correspond to the ripple profile of other optical channels being routed through the add/drop node. In this manner, the gain ripple in the WDM signal being output from the add/drop node approximately corresponds to the gain ripple in the incoming WDM signal at the node.
    Type: Application
    Filed: July 9, 2001
    Publication date: January 9, 2003
    Inventors: Carl A. Caroli, Robert D. Feldman, Scott D. Young
  • Publication number: 20030002104
    Abstract: A WDM input signal received at an add/drop node is coupled onto both a “drop” transmission path and a “through” transmission path within the node. Optical channels to be dropped are then processed within the “drop” path, such as by optical demultiplexing. Because a copy of the same WDM input signal is routed on the “through” path, a dynamically configurable and programmable wavelength blocker selectively blocks the optical channels that are being dropped from the WDM input signal and passes through those optical channels not being dropped onto the “through” path. In an “add” path within the node, optical channels are selectively added, such as by using optical multiplexing. Those optical channels from the multiplexed optical signal that are not designated for “add” (e.g., “unused” channels) are selectively blocked within the “add” transmission path.
    Type: Application
    Filed: June 29, 2001
    Publication date: January 2, 2003
    Inventors: Carl A. Caroli, Christopher Richard Doerr, Robert D. Feldman
  • Publication number: 20020075534
    Abstract: A method for identifying faults in a branched optical network having a central office optically connected to a plurality of optical network units by a plurality of optical paths. The method involves transmitting an optical signal from the central office to the optical network units reflecting a portion of the transmitted optical signal back to the central office. This reflected signal is then used to determine whether a fault exists in the branched optical network.
    Type: Application
    Filed: March 26, 1999
    Publication date: June 20, 2002
    Inventor: ROBERT D. FELDMAN
  • Patent number: 6137607
    Abstract: A method and apparatus for substantially reducing OBI on optical networks in which a number of source lasers operate simultaneously and the output from the lasers is subsequently combined in the network. The method involves operating the laser in burst mode such that the laser is operational only during transmission periods.
    Type: Grant
    Filed: February 23, 1998
    Date of Patent: October 24, 2000
    Assignee: Lucent Technologies Inc.
    Inventors: Robert D. Feldman, Gordon Cook Wilson, Thomas Huntington Wood
  • Patent number: 6137611
    Abstract: Low-noise, bidirectional communications in a fiber optic cable is achieved by coupling a first end of the cable to an optical power source having an inherently broad spectral width. A second end of the cable is coupled to an optical detector having a detector bandwidth, such that the bandwidth of the optical power source is greater than the detector bandwidth. When the bandwidth of the optical power source is large compared to the bandwidth of the detector, the beat frequencies resulting from coherent Rayleigh noise fall outside the bandwidth of the detector and are not detected.
    Type: Grant
    Filed: September 27, 1997
    Date of Patent: October 24, 2000
    Assignee: Lucent Technologies Inc.
    Inventors: Luc Boivin, Robert D. Feldman, Martin C. Nuss
  • Patent number: 5864413
    Abstract: A passive optical network for the downstream dense wavelength division multiplexing communication of data between a host terminal complex (HTC) and a plurality of optical network units (ONUs), and for the upstream communication of data from the ONUs to the HTC. The network includes a routing device for distributing downstream data signals contained in a common frequency band among a plurality of fiber drop lines for providing a corresponding wavelength to a corresponding ONU. The routing device also combines upstream data signals contained in a frequency band other than the downstream common frequency band, which are input to the routing device on the plurality of fiber drop lines, to a multi-wavelength signal which is provided to the HTC. In a preferred embodiment, the upstream data signals are output by the routing device to a broadcast port.
    Type: Grant
    Filed: February 23, 1996
    Date of Patent: January 26, 1999
    Assignee: Lucent Technologies, Inc.
    Inventors: Robert D. Feldman, Clinton R. Giles, Thomas H. Wood
  • Patent number: 5661585
    Abstract: A lightwave communication system includes an optical distribution system for routing optical signals and a plurality of optical transmitters coupled to the optical distribution system. At least one of the optical transmitters has an amplified light emitting diode for generating an optical spectrum. At least one optical receiver is optically coupled to the optical distribution system.
    Type: Grant
    Filed: February 27, 1995
    Date of Patent: August 26, 1997
    Assignee: Lucent Technologies Inc.
    Inventors: Robert D. Feldman, Kang-Yih Liou
  • Patent number: 4999694
    Abstract: In this invention, there is disclosed a new photodiode which comprises a semimetal/semiconductor junction. Distortion of the bands associated with this type of junction result in current flow when an electron hole pair is formed by, for example, a photon impinging upon the junction. The photodiode operates in the photovoltaic mode. However, rather than relying on impurity doping to fabricate a p-n junction, the semimetallic nature of HgTe and its large conduction band offsets with Hg.sub.1-x Cd.sub.x Te are used to create a rectifying Schottky like structure.
    Type: Grant
    Filed: August 18, 1989
    Date of Patent: March 12, 1991
    Assignee: AT&T Bell Laboratories
    Inventors: Richard F. Austin, Robert D. Feldman, James W. Sulhoff, John L. Zyskind