Patents by Inventor Stewart D. Personick

Stewart D. Personick 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).

  • Publication number: 20020191588
    Abstract: An integrated packet switching and circuit switching network for transporting data received from a plurality of sources across the network as one of packet switched packets and circuit switched packets. The network comprises one or more input transitional switches, one or more output transitional switches, and one or more one core switches, including a packet router and a time divided-space switch, connected between the input transitional switch and the output transitional switch by time division multiplexed communication links. The communication links transport the received data in a plurality of fixed length time slots occurring within a periodically repeating cycle signal. Packet switched packets received at the core switch are switched by the router according to information within a header in each packet switched packet. Circuit switched packets received at the core switch are time-division-space switched according to an allocation of specific ones of the time slots.
    Type: Application
    Filed: October 3, 2001
    Publication date: December 19, 2002
    Applicant: Drexel University
    Inventor: Stewart D. Personick
  • Patent number: 4658394
    Abstract: An optical distribution architecture is disclosed wherein wavelength stabilized continuous wavelength lasers are centrally positioned in tandem with star couplers to distributed laser power among a plurality of lightguide paths. The laser power apportioned to each such path may then be locally or remotely modulated thereby reducing the number of lasers required to equip a network. Advantageously, lightguide fibres are single mode and polarization maintaining.
    Type: Grant
    Filed: December 12, 1984
    Date of Patent: April 14, 1987
    Assignees: Bell Communications Research, Inc., AT&T Bell Laboratories
    Inventors: Steven S. Cheng, Jan Lipson, Stewart D. Personick
  • Patent number: 4642804
    Abstract: An optical transmission network for transmitting information between two locations is disclosed. The transmission network comprises a collection of individual two-way links with all optical sources at one end.At a first location, the outputs of at least two lasers, operating at first and second wavelengths respectively, are multiplexed together, the resulting optical power being divided between a plurality of single mode optical fiber transmission paths. Each optical transmission path may include a wavelength selective modulator for modulating information onto the first wavelength for transmission from the first location to the second location.At the second location, the wavelengths are separated and the information modulated onto the first wavelength is detected. The second wavelength may be modulated with information to be transmitted back to the first location. No dedicated laser is required at the second location.
    Type: Grant
    Filed: May 10, 1985
    Date of Patent: February 10, 1987
    Assignee: Bell Communications Research, Inc.
    Inventor: Stewart D. Personick
  • Patent number: 4477725
    Abstract: A system for remote measurement of structural forces includes a plurality of microbend transducers mounted along the length of the structure for microbending an optical fiber in response to structural forces, such as stress acting upon an oil or gas pipeline or the like. An optical time domain reflectometer (OTDR) has a light source for launching a pulsed optical signal for passage through the fiber and a photodetector for sensing as a function of time the intensity of backscattered light reflected back through the fiber, wherein this sensed time function is correlated directly with discrete longitudinal positions along the length of the fiber and the structure. When one or more of the microbend transducers is activated to induce a microbend in the fiber in response to localized forces acting upon the structure, a portion of the backscattered light is lost at the microbend. This attenuation in backscattered light intensity is sensed quantitatively and positionally identified by the photodetector.
    Type: Grant
    Filed: August 27, 1981
    Date of Patent: October 16, 1984
    Assignee: TRW Inc.
    Inventors: Charles K. Asawa, Joseph W. Austin, Michael K. Barnoski, Allan R. Jackson, Stewart D. Personick, Shi-Kay Yao
  • Patent number: 4459477
    Abstract: A system for remote measurement of structural forces includes a plurality of microbend transducers mounted along the length of the structure for microbending an optical fiber in response to structural forces, such as stress acting upon an oil or gas pipeline or the like. An optical time domain reflectometer (OTDR) has a light source for launching a pulsed optical signal for passage through the fiber and a photodetector for sensing as a function of time the intensity of backscattered light reflected back through the fiber, wherein this sensed time function is correlated directly with discrete longitudinal positions along the length of the fiber and the structure. When one or more of the microbend transducers is activated to induce a microbend in the fiber in response to localized forces acting upon the structure, a portion of the backscattered light is lost at the microbend. This attenuation in backscattered light intensity is sensed quantitatively and positionally identified by the photodetector.
    Type: Grant
    Filed: August 27, 1981
    Date of Patent: July 10, 1984
    Assignee: TRW Inc.
    Inventors: Charles K. Asawa, Joseph W. Austin, Michael K. Barnoski, Stewart D. Personick, Shi-Kay Yao