Patents by Inventor Hercules Avramopoulos

Hercules Avramopoulos 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: 10996401
    Abstract: An optical coupler and method of assembly are described that provide efficient coupling from the photonic integrated circuit (PIC) waveguide layer to external components, such as optical fibers, VCSELs, photodetectors, and gain blocks, among others. The optical coupler includes a PIC that can be supported by a printed circuit board, an optoelectronic transducer supported by the PIC that can convert between optical signals and corresponding electrical signals, and a coupled waveguide assembly. The coupled waveguide assembly includes a low-index waveguide, a high-index waveguide, and a reflective surface that changes a pathway of the optical signals to direct the optical signals from the optoelectronic transducer into the low-index waveguide or from the low-index waveguide into the optoelectronic transducer.
    Type: Grant
    Filed: June 30, 2016
    Date of Patent: May 4, 2021
    Assignee: Mellanox Technologies, Ltd.
    Inventors: Elad Mentovich, Itshak Kalifa, Sylvie Rockman, Anna Sandomirsky, Giannis Poulopoulos, Dimitrios Kalavrouziotis, Paraskevas Bakopoulos, Hercules Avramopoulos, Xin Yin, Geert Van Steenberge
  • Patent number: 5369520
    Abstract: An optical regenerator includes a clock recovery circuit which recovers an optical clock signal from a received deteriorated optical data signal. The recovered optical clock signal is used to generate a new optical clock signal. The new optical clock signal and the received deteriorated optical data signal are applied as an input signal and control signal, respectively, to a Sagnac switch which encodes the new optical clock signal with the encoded information of the deteriorated optical data signal thereby regenerating a clean optical data signal.
    Type: Grant
    Filed: May 22, 1992
    Date of Patent: November 29, 1994
    Assignee: AT&T Corp.
    Inventors: Hercules Avramopoulos, Norman A. Whitaker, Jr.
  • Patent number: 5208705
    Abstract: An optical linear feedback shift register arrangement includes an optical encoding means implemented using a modified Sagnac switch. The encoding means encodes a received optical clock signal with a value derived from an exclusive-or of a first and second delayed version of an encoded signal received, respectively, at a first and second control ports. The resulting encoded clock signal, appearing at an output port, is then coupled through a first delay means to said first control port and coupled through a second delay means to said second control port. In another arrangement, an optical communication system utilizes the above-described linear feedback shift register to encode a data signal at a transmitter location and uses an identical linear feedback shift register at the receiver location to decode the encoded data signal.
    Type: Grant
    Filed: November 5, 1991
    Date of Patent: May 4, 1993
    Assignee: AT&T Bell Laboratories
    Inventors: Hercules Avramopoulos, Alan Huang, Norman A. Whitaker, Jr.
  • Patent number: 5155779
    Abstract: An all-optical circulating shift register encodes a received optical clock signal with a value derived from an encoded optical signal received at a control port thereof. A data input to the shift register is used to modify an encoded optical signal. The resulting encoded clock signal, appearing at an output port, is coupled back to the control port. The shift register uses the encoded clock signal at the control port to encode a subsequently-received clock signal. In one embodiment, the optical shift register is implemented using a Sagnac switch having a feedback path coupled between an output port and a control port of the Sagnac switch.
    Type: Grant
    Filed: November 5, 1991
    Date of Patent: October 13, 1992
    Assignee: AT&T Bell Laboratories
    Inventors: Hercules Avramopoulos, M. Christina Gabriel, Alan Huang, Norman A. Whitaker, Jr.
  • Patent number: 5146517
    Abstract: Transmission capabilities of optical fibers are enhanced with all-optical means for removing noise from signal pulses and for creating clean output pulses with specified characteristics. This is accomplished with a nonlinear interferometer that is designed to operate on an amplified optical signal in the manner of a threshold device. More specifically, the nonlinear interferometer is designed to have a relatively level region in its input/output transfer function in the neighborhood of the low input signal and in the neighborhood of the high input signal. Depending on the input signal characteristics, it is sometimes beneficial to design the interfereometer so that the nominal high level of the input signal falls approximately in the middle of its corresponding flat region. In another embodiment, a bandpass filter is included at the output of the interferometer to remove the excess bandwidth that is created by the preceding amplifiers and the interferometer itself.
    Type: Grant
    Filed: July 5, 1991
    Date of Patent: September 8, 1992
    Assignee: AT&T Bell Laboratories
    Inventors: Hercules Avramopoulos, Paul M. William French, M. Christina Gabriel, Norman A. Whitaker, Jr.