Patents Assigned to Opnext Subsystems, Inc.
  • Optical receivers with controllable transfer function bandwidth and gain imbalance
    Patent number: 8023833
    Abstract: Techniques, devices and systems based on optical receivers with controllable transfer function bandwidth and gain imbalance.
    Type: Grant
    Filed: March 26, 2010
    Date of Patent: September 20, 2011
    Assignee: Opnext Subsystems, Inc.
    Inventors: Christian Malouin, Theodore J. Schmidt, Brian L. Heffner, Yannick Keith Lize, Gordon Ries
  • Optical receiver having bandwidth control for intersymbol interference compensation
    Patent number: 7991300
    Abstract: Apparatus and techniques for receiving and processing an optical signal. In one implementation, an optical receiver is provided to include a delay line interferometer, an etalon, and a data estimator for estimating the data carried on a differentially modulated optical input signal. The delay line interferometer receives the input signal and issues differentially decoded constructive and destructive signals. The etalon filters the constructive signal with a transmission stopband imposed over the passband of the constructive signal. The bandwidth of the etalon stopband is selected based on the bandwidth of the modulation of the input signal in order to maximize received signal quality. The data estimator uses a difference between signals derived from the filtered constructive signal and the destructive signal for estimating data.
    Type: Grant
    Filed: November 5, 2007
    Date of Patent: August 2, 2011
    Assignee: Opnext Subsystems, Inc.
    Inventors: Brian L. Heffner, Christian Malouin, Theodore J. Schmidt
  • Adjustable bit rate optical transmission using programmable signal modulation
    Patent number: 7986878
    Abstract: Techniques, apparatus and systems to provide adjustable bit rate optical transmission using programmable signal modulation in optical communication systems.
    Type: Grant
    Filed: February 5, 2008
    Date of Patent: July 26, 2011
    Assignee: Opnext Subsystems, Inc.
    Inventors: Ross Alexander Saunders, Roberto Marcoccia, Steven Keck, Theodore J. Schmidt, Christian Malouin
  • Optical receiver having FSR phase compensation
    Patent number: 7983573
    Abstract: An optical receiver apparatus and methods for mitigating intersymbol interference (ISI) in a differentially-encoded modulation transmission system by controlling constructive and destructive transfer functions. The receiver includes a bandwidth control element for controlling transfer function bandwidth, a transfer phase controller for controlling transfer function phase and/or an imbalancer for imbalancing the transfer functions for compensating for intersymbol interference and optimizing the quality of the received optical signal.
    Type: Grant
    Filed: March 14, 2007
    Date of Patent: July 19, 2011
    Assignee: Opnext Subsystems, Inc.
    Inventors: Christian Malouin, Theodore J. Schmidt, Brian L. Heffner
  • GT decoder having bandwidth control for ISI compensation
    Patent number: 7970289
    Abstract: An optical receiver apparatus and methods for mitigating intersymbol interference (ISI) in a differentially-encoded modulation transmission system by controlling constructive and destructive transfer functions. The receiver includes a bandwidth control element for controlling transfer function bandwidth, a transfer phase controller for controlling transfer function phase and/or an imbalancer for imbalancing the transfer functions for compensating for intersymbol interference and optimizing the quality of the received optical signal.
    Type: Grant
    Filed: May 30, 2007
    Date of Patent: June 28, 2011
    Assignee: Opnext Subsystems, Inc.
    Inventors: Brian L. Heffner, Christian Malouin, Theodore J. Schmidt
  • Optical Receivers with Controllable Transfer Function Bandwidth and Gain Imbalance
    Publication number: 20100284702
    Abstract: Techniques, devices and systems based on optical receivers with controllable transfer function bandwidth and gain imbalance.
    Type: Application
    Filed: March 26, 2010
    Publication date: November 11, 2010
    Applicant: OPNEXT SUBSYSTEMS, INC.
    Inventors: Christian Malouin, Theodore J. Schmidt, Brian L. Heffner, Yannick Keith Lize, Gordon Ries