Including Electrical Oscillator Patents (Class 398/163)
  • Patent number: 10187143
    Abstract: In an example, the present invention includes an integrated system-on-chip device. The device is configured on a single silicon substrate member. The device has a data input/output interface provided on the substrate member. The device has an input/output block provided on the substrate member and coupled to the data input/output interface. The device has a signal processing block provided on the substrate member and coupled to the input/output block. The device has a driver module provided on the substrate member and coupled to the signal processing block. In an example, the device has a driver interface provided on the substrate member and coupled to the driver module and configured to be coupled to a silicon photonics device. In an example, a control block is configured to receive and send instruction(s) in a digital format to the communication block and is configured to receive and send signals in an analog format to communicate with the silicon photonics device.
    Type: Grant
    Filed: May 9, 2018
    Date of Patent: January 22, 2019
    Assignee: INPHI CORPORATION
    Inventor: Radhakrishnan L. Nagarajan
  • Patent number: 10014936
    Abstract: In an example, the present invention includes an integrated system-on-chip device. The device is configured on a single silicon substrate member. The device has a data input/output interface provided on the substrate member. The device has an input/output block provided on the substrate member and coupled to the data input/output interface. The device has a signal processing block provided on the substrate member and coupled to the input/output block. The device has a driver module provided on the substrate member and coupled to the signal processing block. In an example, the device has a driver interface provided on the substrate member and coupled to the driver module and configured to be coupled to a silicon photonics device. In an example, a control block is configured to receive and send instruction(s) in a digital format to the communication block and is configured to receive and send signals in an analog format to communicate with the silicon photonics device.
    Type: Grant
    Filed: February 23, 2018
    Date of Patent: July 3, 2018
    Assignee: INPHI CORPORATION
    Inventor: Radhakrishnan L. Nagarajan
  • Patent number: 9935706
    Abstract: In an example, the present invention includes an integrated system-on-chip device. The device is configured on a single silicon substrate member. The device has a data input/output interface provided on the substrate member. The device has an input/output block provided on the substrate member and coupled to the data input/output interface. The device has a signal processing block provided on the substrate member and coupled to the input/output block. The device has a driver module provided on the substrate member and coupled to the signal processing block. In an example, the device has a driver interface provided on the substrate member and coupled to the driver module and configured to be coupled to a silicon photonics device. In an example, a control block is configured to receive and send instruction(s) in a digital format to the communication block and is configured to receive and send signals in an analog format to communicate with the silicon photonics device.
    Type: Grant
    Filed: August 16, 2017
    Date of Patent: April 3, 2018
    Assignee: INPHI CORPORATION
    Inventor: Radhakrishnan L. Nagarajan
  • Patent number: 9774391
    Abstract: In an example, the present invention includes an integrated system-on-chip device. The device is configured on a single silicon substrate member. The device has a data input/output interface provided on the substrate member. The device has an input/output block provided on the substrate member and coupled to the data input/output interface. The device has a signal processing block provided on the substrate member and coupled to the input/output block. The device has a driver module provided on the substrate member and coupled to the signal processing block. In an example, the device has a driver interface provided on the substrate member and coupled to the driver module and configured to be coupled to a silicon photonics device. In an example, a control block is configured to receive and send instruction(s) in a digital format to the communication block and is configured to receive and send signals in an analog format to communicate with the silicon photonics device.
    Type: Grant
    Filed: January 13, 2017
    Date of Patent: September 26, 2017
    Assignee: INPHI CORPORATION
    Inventor: Radhakrishnan L. Nagarajan
  • Patent number: 9548809
    Abstract: In an example, the present invention includes an integrated system-on-chip device. In an example, a control block is configured to receive and send instruction(s) in a digital format to the communication block and is configured to receive and send signals in an analog format to communicate with the silicon photonics device.
    Type: Grant
    Filed: June 20, 2014
    Date of Patent: January 17, 2017
    Assignee: INPHI CORPORATION
    Inventor: Radhakrishnan L. Nagarajan
  • Patent number: 9520944
    Abstract: An optical communication device includes an optical fiber, two chips, a light emitter, a photoelectric conversion device, and a circuit board. The chips includes a substrate, and a polarizing beam splitter positioned on the substrate, the polarizing beam splitter includes a first coupling device, second coupling device, a Y-waveguide, and a TM filter coupling to the third channel. The chips, the light emitter, and the photoelectric conversion device are coupled to the circuit board, the light emitter, and the photoelectric conversion device are connected electrically with the circuit board.
    Type: Grant
    Filed: June 11, 2015
    Date of Patent: December 13, 2016
    Assignee: HON HAI PRECISION INDUSTRY CO., LTD.
    Inventor: Hsin-Shun Huang
  • Patent number: 9184836
    Abstract: A data transmission system has a light-emitting transmitter, a light-receiving receiver and a data transmission channel based on incoherent light. A pre-equalization device connected upstream of the transmitter is provided for the purpose of pre-equalizing a data signal which is to be transmitted from the transmitter to the receiver via the data transmission channel. The data transmission channel has constant transmission conditions within prescribed limits. The data signal to be transmitted is transmitted using a prescribed maximum bandwidth of the transmitter.
    Type: Grant
    Filed: July 10, 2008
    Date of Patent: November 10, 2015
    Assignee: SIEMENS AKTIENGESELLSCAFT
    Inventors: Florian Breyer, Sebastian Randel, Joachim Walewski
  • Patent number: 8989596
    Abstract: An optical communication system has a receiver that includes a plurality of photon counting sensors that each receive photons and generate pulses based on the received photons, and an electronic circuit that aggregates the number of pulses from the plurality of photon counting sensors into a merged pulse count. A demodulator samples the merged pulse count at predetermined time intervals to determine a number of photons received by the plurality of photon counting sensors during different sampling time intervals.
    Type: Grant
    Filed: November 29, 2012
    Date of Patent: March 24, 2015
    Assignee: Northrop Grumman Systems Corporation
    Inventor: Oliver W. Saunders
  • Patent number: 8923705
    Abstract: One embodiment is a Poisson-based communication system. The system includes a receiver that comprises a photodetector that receives photons and generates pulses based on the received photons, a sampling event counter that counts the number of generated pulses by the photodetector and a demodulator. The demodulator samples the sampling event counter at predetermined time intervals to determine an occurrence of a first state when light pulse energy has been transmitted by a transmitter and received by the photodetector and an occurrence of a second state when light pulse energy has not been transmitted by the transmitter and received by the photodetector.
    Type: Grant
    Filed: March 6, 2012
    Date of Patent: December 30, 2014
    Assignee: Northrop Grumman Systems Corporation
    Inventors: Oliver W Saunders, Russell Kadota
  • Patent number: 8750717
    Abstract: A spread spectrum waveform generator has a photonic oscillator and an optical heterodyne synthesizer. The photonic oscillator is a multi-tone optical comb generator for generating a series of RF comb lines on an optical carrier. The optical heterodyne synthesizer includes first and second phase-locked lasers, where the first laser feeds the multi-tone optical comb generator and the second laser is a single tone laser whose output light provides a frequency translation reference. At least one photodetector is provided for heterodyning the frequency translation reference with the optical output of the photonic oscillator to generate a spread spectrum waveform. A receiver pre-processor may be provided to operate on the spread spectrum waveform.
    Type: Grant
    Filed: August 27, 2013
    Date of Patent: June 10, 2014
    Assignee: HRL Laboratories, LLC
    Inventors: Daniel Yap, Keyvan Sayyah
  • Patent number: 8615170
    Abstract: A method of controlling a timing state of a local oscillator (17) being synchronized by a timing signal (ST1) provided through one-way transmission from a remote master oscillator (6) through a dielectric waveguide (4).
    Type: Grant
    Filed: November 11, 2010
    Date of Patent: December 24, 2013
    Assignee: SP Svergies Tekniska Forskningsinstitut AB
    Inventors: Per Olof Hedekvist, Sven-Christian Ebenhag
  • Patent number: 8565609
    Abstract: A system for distributing a reference oscillator signal includes a clock having a reference oscillator and a femtosecond laser stabilized by the reference oscillator. The system also includes at least one beamsplitter configured to split the femtosecond laser. The system further includes one or more remote nodes that are spaced from the clock. The remote nodes are configured to generate reference signals based on the split femtosecond laser.
    Type: Grant
    Filed: December 15, 2010
    Date of Patent: October 22, 2013
    Assignee: Raytheon Company
    Inventors: Steven R. Wilkinson, Matthew T. Cashen, Todd O. Clatterbuck
  • Publication number: 20130236194
    Abstract: One embodiment is a Poisson-based communication system. The system includes a receiver that comprises a photodetector that receives photons and generates pulses based on the received photons, a sampling event counter that counts the number of generated pulses by the photodetector and a demodulator. The demodulator samples the sampling event counter at predetermined time intervals to determine an occurrence of a first state when light pulse energy has been transmitted by a transmitter and received by the photodetector and an occurrence of a second state when light pulse energy has not been transmitted by the transmitter and received by the photodetector.
    Type: Application
    Filed: March 6, 2012
    Publication date: September 12, 2013
    Inventors: Oliver W. Saunders, Russell Kadota
  • Patent number: 8503890
    Abstract: A signal processing device includes an amplifier, a filter module, a demodulation module and a band control module. When the band control module controls the filter module to output a specific single-channel signal, the resonator of the demodulator is switched to resonate the selected single-channel signal. Then the selected single-channel signal is demodulated. A signal processing method and an infrared multi-channel receiver are also described herein.
    Type: Grant
    Filed: September 17, 2010
    Date of Patent: August 6, 2013
    Assignee: RFlife Technology Inc.
    Inventor: Ko-Yu Hsia
  • Patent number: 8374514
    Abstract: A method includes modulating lightwaves to provide first and second OFDM signal sidebands at a first polarization direction and first and second OFDM signal sidebands at a second polarization direction, and combining sidebands that are oppositely positioned and joined from the first and second OFDM signal sidebands at each polarization direction to provide a polarization multiplexing OFDM signal.
    Type: Grant
    Filed: April 15, 2010
    Date of Patent: February 12, 2013
    Assignee: NEC Laboratories America, Inc.
    Inventors: Yue-Kai Huang, Ting Wang, Dayou Qian, Robert Saperstein
  • Patent number: 8351796
    Abstract: A low-noise block downconverter includes a first down-converting circuit for down-converting and filtering a first polarization signal for outputting a first intermediate-frequency signal, a second down-converting circuit for down-converting and filtering a second polarization signal for outputting a second intermediate-frequency signal, wherein a frequency band of the first intermediate-frequency signal is the same as that of the second intermediate-frequency signal, an oscillator for generating an oscillating signal, outputted to the first down-converting circuit and the second down-converting circuit, a first optical transmitter coupled to the first down-converting circuit for converting the first intermediate-frequency signal into a first optical signal, and a second optical transmitter coupled to the second down-converting circuit for converting the second intermediate-frequency signal into a second optical signal.
    Type: Grant
    Filed: June 17, 2010
    Date of Patent: January 8, 2013
    Assignee: Wistron NeWeb Corporation
    Inventor: Che-Ming Wang
  • Patent number: 8340530
    Abstract: A system and method implementing dual stage carrier frequency offset compensation (FOC) in a coherent receiver for an optical communication system. In the first stage, a feed forward FOC function compensates for relatively slowly drifting frequency offsets. In a second stage, a decision-feedback FOC function compensates for relatively quickly drifting frequency offsets. The feed forward frequency offset compensation may be implemented with a feed forward carrier phase estimation function and the decision-feedback frequency offset compensation may be implemented with a decision-feedback carrier phase estimation function.
    Type: Grant
    Filed: March 5, 2010
    Date of Patent: December 25, 2012
    Assignee: Tyco Electronics Subsea Communications LLC
    Inventor: Yi Cai
  • Patent number: 8335438
    Abstract: According to particular embodiments, a signal communicated from a transmitter to a receiver is received. A frequency offset estimate of the signal is determined. The frequency offset estimate indicates a frequency difference between the transmitter and the receiver. The frequency offset estimate is provided as feedback. A next frequency offset is compensated for according to the feedback.
    Type: Grant
    Filed: October 30, 2009
    Date of Patent: December 18, 2012
    Assignee: Fujitsu Limited
    Inventors: Inwoong Kim, Takao Naito
  • Patent number: 8311415
    Abstract: A frequency up-conversion system includes an optical splitter, an optical modulator, an optical phase-shifter, and an optical coupler. In one embodiment of the present disclosure, the optical splitter is configured to split an optical wave into a first optical wave and a second optical wave, the optical modulator is configured to modulate the first optical wave to form a modulation wave, the optical phase-shifter is configured to shift the phase of the second optical wave by a predetermined phase to form a shifting wave, and the optical coupler is configured to couple the modulation wave and the shifting wave. In one embodiment of the present disclosure, the optical modulator and the optical phase-shifter are connected in a parallel manner.
    Type: Grant
    Filed: April 15, 2010
    Date of Patent: November 13, 2012
    Assignee: Industrial Technology Research Institute
    Inventors: Chun Ting Lin, Wen Jr Jiang, Jyehong Chen, Sien Chi, Dar Zu Hsu
  • Patent number: 8306434
    Abstract: A signal-transmitting system includes a digital-to-analog converter, an optical modulator, first and second electrodes, an optical phase shifter, and an optical coupler. The digital-to-analog converter converts digital data into an electrical analog signal. The optical modulator includes a first optical waveguide configured to transmit a first optical carrier, a second optical waveguide configured to transmit a second optical carrier, a first electrode positioned on the first optical waveguide, and a second electrode positioned on the second optical waveguide. The first and second electrical couplers are configured to couple respective electrical analog signals and electrical carriers to electrodes to generate modulation waves. The modulation waves are different in phase. The optical phase shifter is configured to shift the second modulation wave by a predetermined phase, and the optical coupler is configured to couple the first and second modulation waves to generate an optical output signal.
    Type: Grant
    Filed: April 15, 2010
    Date of Patent: November 6, 2012
    Assignee: Industrial Technology Research Institute
    Inventors: Chun Ting Lin, Wen Jr Jiang, Jyehong Chen, Sien Chi, Dar Zu Hsu
  • Publication number: 20120224855
    Abstract: An optical phase conjugator that can be deployed within a long-haul fiber-optic link of an optical WDM system to improve the system's tolerance to intra- and inter-channel nonlinear effects. In one embodiment, the optical phase conjugator has a digital signal processor configured to perform, in the digital electrical domain, a phase-conjugation transformation for various components of a WDM signal so that certain signal distortions imposed on that signal in the front portion of the fiber-optic link are reduced in the back portion of the link. Advantageously, the optical phase conjugator is flexibly configurable to employ an input-to-output carrier-frequency-mapping configuration that is most beneficial under particular operating conditions.
    Type: Application
    Filed: March 3, 2011
    Publication date: September 6, 2012
    Applicant: ALCATEL-LUCENT USA INC.
    Inventors: Xiang Liu, Chandrasekhar Sethumadhavan, Robert W. Tkach
  • Patent number: 8078061
    Abstract: The present invention discloses a wavelength-division multiplexing passive optical network (WDM-PON) capable of high-bandwidth transmission for optical signals by using modulation format having high spectral efficiency. The WDM-PON according to the present invention provides a larger capacity and higher bandwidth transmission economically (at lower costs) by using a modulation format where spectral efficiency (a transmission bit number per a unit band width) is high, while using a low noise part of a light source.
    Type: Grant
    Filed: November 14, 2006
    Date of Patent: December 13, 2011
    Assignee: Korea Advanced Institute of Science and Technology
    Inventors: Chang-Hee Lee, Ki-Man Choi, Sil-Gu Mun, Jung-Hyung Moon
  • Publication number: 20110299856
    Abstract: A photodetector receiver circuit for an optical communication system includes an optical photodetector which receives optical signals and converts them into an electrical current. In one illustrative embodiment, a dynamic impedance module which switches the receiver circuit between a high impedance state and a low impedance state and a buffer stage which receives the electrical current and converts the electrical current into a voltage signal compatible with a digital circuit. A method for receiving an optical signal includes, receiving the optical signal and converting it into an electrical pulse train, switching a dynamic impedance module between a high impedance state and a low impedance state, transforming the electrical pulse train into an output voltage signal using a buffer stage, and receiving the output voltage signal by a digital circuit.
    Type: Application
    Filed: February 23, 2009
    Publication date: December 8, 2011
    Inventors: Kyung Hoae Koo, Marco Fiorentino, David A. Fattal
  • Patent number: 8005374
    Abstract: An optical transmission system is provided in which the optimum operating point of a Mach-Zehnder interferometer, matched to the optical frequency of the light source on the transmitting side, can be set.
    Type: Grant
    Filed: March 12, 2010
    Date of Patent: August 23, 2011
    Assignee: Nippon Telegraph and Telephone Corporation
    Inventors: Kazushige Yonenaga, Mikio Yoneyama, Masahito Tomizawa, Akira Hirano, Shoichiro Kuwahara, Tomoyoshi Kataoka, Akihide Sano, Gentaro Funatsu
  • Patent number: 7937739
    Abstract: Embodiments of the invention provide a method, device and/or system for communicating over a wideband distribution network. The device may include, for example, a downstream conversion module for converting a legacy downstream electrical signal of a legacy downstream frequency band into an extended downstream optical signal of an extended downstream frequency band; and/or an upstream conversion module for converting an extended upstream optical signal of an extended upstream frequency band into a legacy upstream electrical signal of a legacy upstream frequency band. Other embodiments are described and claimed.
    Type: Grant
    Filed: March 29, 2005
    Date of Patent: May 3, 2011
    Assignee: Xtend Networks
    Inventors: Ron Shani, Yeshayahu Strull, Semion Kofman
  • Publication number: 20100196008
    Abstract: First and second transmitted optical waves having orthogonal polarization states are combined in a polarization multiplexed optical wave. At an optical receiver, an electrical field of the polarization multiplexed optical wave is measured. A plurality of polarization states of the polarization multiplexed optical wave is determined from the measured electrical field. From the plurality of polarization states, a transform that aligns the orthogonal polarization states of the first and second transmitted optical waves with respect to principal axes of the optical receiver is estimated. The first and second transmitted optical waves are recovered by applying the transform to one of i) the polarization multiplexed optical wave and ii) the measured electrical field of the polarization multiplexed optical wave.
    Type: Application
    Filed: January 30, 2009
    Publication date: August 5, 2010
    Inventors: Bogdan Szafraniec, Bernd Nebendahl
  • Patent number: 7751722
    Abstract: To provide an optical transmission system which cancels out noise components and whose construction cost is lower than that of the conventional system, the present invention is an optical transmission system for transmitting an optical signal from an optical transmitter to an optical receiver and outputting an output electrical signal after a noise canceling process is performed. The optical receiver and transmitter are connected by one optical fiber, through which an optical signal is transmitted before being intensity-modulated.
    Type: Grant
    Filed: February 6, 2004
    Date of Patent: July 6, 2010
    Assignee: Panasonic Corporation
    Inventor: Hiroyuki Sasai
  • Patent number: 7734194
    Abstract: An optical transmission system is provided in which the optimum operating point of a Mach-Zehnder interferometer, matched to the optical frequency of the light source on the transmitting side, can be set.
    Type: Grant
    Filed: March 17, 2005
    Date of Patent: June 8, 2010
    Assignee: Nippon Telegraph and Telephone Corporation
    Inventors: Kazushige Yonenaga, Mikio Yoneyama, Masahito Tomizawa, Akira Hirano, Shoichiro Kuwahara, Tomoyoshi Kataoka, Akihide Sano, Gentaro Funatsu
  • Patent number: 7715720
    Abstract: An optical device is provided with first and second inputs. A first coupler coupled is coupled to the first input and produces at least a first and second output. A second coupler is coupled to the second input and produces at least a first and second output. A third coupler is coupled to the first output of the first coupler and to the first output of the second coupler. A fourth coupler is coupled to the second output of the first coupler and to the second output of the second coupler. First and second crossing waveguides are provided with an angle selected to minimize crosstalk and losses between the first and second cross waveguides. The first crossing waveguide connects one of the first or second outputs from the first coupler with an input of the fourth coupler. The second crossing waveguide connects one of the first or second outputs from the second coupler with an input of the third coupler. A first phase shifter is coupled to the first and second waveguides.
    Type: Grant
    Filed: April 3, 2007
    Date of Patent: May 11, 2010
    Assignee: CeLight, Inc.
    Inventors: Isaac Shpantzer, Aviv Salamon, Pak Shing Cho
  • Publication number: 20100098421
    Abstract: An optical interface method includes producing a digital wrapper signal by synchronizing a client signal that is inputted via an optical transmission channel with an oscillating frequency of a fixed oscillator; returning the digital wrapper signal back into the client signal; and outputting the client signal obtained from the digital wrapper signal by the returning onto the optical transmission channel. The oscillating frequency of the fixed oscillator is set higher than a frequency of the client signal in the optical transmission channel.
    Type: Application
    Filed: December 15, 2009
    Publication date: April 22, 2010
    Applicant: FUJITSU LIMITED
    Inventor: Sunao Itou
  • Patent number: 7687791
    Abstract: Data signal isolation apparatus comprising a first media converter adapted to convert outgoing electrical data signals into outgoing optical data signals, an optical data signal transmission means adapted to transmit said outgoing optical data signals, a second media converter adapted to convert said outgoing optical data signals back into outgoing electrical data signals, and an intrinsically safe power supply, in which the optical data signal transmission means comprises an electrical isolation gap, and in which the second media converter is powered by the intrinsically safe power supply.
    Type: Grant
    Filed: April 30, 2007
    Date of Patent: March 30, 2010
    Assignee: Pepperl & Fuchs (DE)
    Inventors: Steffan Graber, Renato Kitchener
  • Patent number: 7634198
    Abstract: A distortion circuit is provided for correcting the distortion from a nonlinear circuit element by generating a frequency dependent signal having a sign opposite to the distortion signal produced by the nonlinear circuit and substantially the same magnitude. The distortion circuit includes an input signal and a first nonlinear device coupled to the input signal for generating a first signal and where the first nonlinear device has a first bias level. Also included is a second nonlinear device different from same first nonlinear device and coupled to the first nonlinear device for modifying the first signal to produce an output second signal, the second nonlinear device having a second bias level. A bias control means is provided for adjusting the first and said second bias levels so that the magnitude, phase and frequency of the output second signal can be adjusted.
    Type: Grant
    Filed: June 21, 2006
    Date of Patent: December 15, 2009
    Assignee: Emcore Corporation
    Inventor: Eva Peral
  • Patent number: 7634201
    Abstract: Tunable receivers and techniques for receiving an electrical oscillator signal in the RF, microwave or millimeter spectral range based on photonics technology to use both (1) photonic or optical components and (2) electronic circuit components.
    Type: Grant
    Filed: September 1, 2007
    Date of Patent: December 15, 2009
    Assignee: OEwaves, Inc.
    Inventors: Lutfollah Maleki, Danny Eliyahu, David Seidel
  • Patent number: 7616898
    Abstract: A method of operating an optical transmission system is described. The transmission system is provided with a bit-to-bit polarization interleaved bitstream having a given bitrate. The transmission system comprises a birefringent element and/or a decision circuit. The birefringent element and/or the decision circuit are triggered by a trigger signal having a frequency of half of the bitrate.
    Type: Grant
    Filed: March 29, 2005
    Date of Patent: November 10, 2009
    Assignee: Alcatel
    Inventors: Gabriel Charlet, Erwan Corbel
  • Patent number: 7574137
    Abstract: An optical communications transmitter includes a oscillator source, producing a clock signal, a data source, producing a data signal, a modulating circuit for modulating the clock signal using the data signal to produce modulating signals, optical drivers, receiving the modulating signals and producing optical driving signals based on the modulating signals and optical emitters, producing small numbers of photons based on the optical driving signals. The small numbers of photons are time-correlated between at least two separate optical transmission wavelengths and quantum states and the small number of photons can be detected by a receiver to reform the data signal.
    Type: Grant
    Filed: May 5, 2006
    Date of Patent: August 11, 2009
    Assignee: The United States of America as represented by the Administrator of the National Aeronautics and Space Administration
    Inventors: John Lekki, Quang-Viet Nguyen
  • Publication number: 20090052905
    Abstract: Signals can be superimposed on optical phase even when low-coherency light is used, and a bit rate and a signal coding format similar to those used in ordinary optical communications can be used. A transmitter includes an asymmetric interferometer or an antisqueezed light generator to convert a train of single pulses into a train of dual pulses. A receiver also includes an asymmetric interferometer that provides the same delay time as that between the dual pulses. The receiver allows pulses originating in the same light source to interfere, so that signals can be superimposed on the phase even when a low-coherency light source is used. The delay time (optical path length difference) provided in the asymmetric interferometer is set to be longer than half the period of the pulses outputted from the optical pulse source.
    Type: Application
    Filed: May 29, 2008
    Publication date: February 26, 2009
    Inventor: Tatsuya Tomaru
  • Patent number: 7447436
    Abstract: A transmitter subsystem generates an optical signal which contains multiple subbands of information. The subbands have different polarizations. For example, in one approach, two or more optical transmitters generate optical signals which have different polarizations. An optical combiner optically combines the optical signals into a composite optical signal for transmission across an optical fiber. In another aspect, each optical transmitter generates an optical signal containing both a lower optical sideband and an upper optical sideband (i.e., a double sideband optical signal). An optical filter selects the upper optical sideband of one optical signal and the lower optical sideband of another optical signal to produce a composite optical signal.
    Type: Grant
    Filed: August 31, 2006
    Date of Patent: November 4, 2008
    Assignee: Forster Energy LLC
    Inventors: Ting K. Yee, Peter H. Chang, Chin-Sheng Tarng, Gregory M. Cutler, Slava Yazhgur, Ji Li, Laurence J. Newell, James F. Coward, Michael W. Rowan, Norman L. Swenson, Matthew C. Bradshaw
  • Patent number: 7447437
    Abstract: An interface arrangement for opto-electronic data transfer which has an electrical plug connection part which includes at least one electrical contact used by a connected plug-in transceiver to provide information related to the data transfer rate at which the connected plug-in transceiver is able to transmit optical signals. An electrical control apparatus connected to this contact is used to set the data transfer rate of signals transferred from an electrical chip to a connected plug-in transceiver, the control apparatus taking several specified data transfer rates and setting that data transfer rate on the electrical chip which is the maximum at which a connected plug-in transceiver is able to transfer, provided that this data transfer rate is lower than the data transfer rate which has been set internally on the electrical chip. An opto-electronic transceiver which can be connected to an interface arrangement in plug-in fashion is also disclosed.
    Type: Grant
    Filed: January 26, 2005
    Date of Patent: November 4, 2008
    Assignee: Infineon Technologies Fiber Optics GmbH
    Inventor: Nikolaus Schunk
  • Publication number: 20080240729
    Abstract: A data transmission system comprising a transmitter and a receiver. The transmitter comprises a phase encoder for partitioning consecutive bit data to be input in data in units of X bits; and converting a 2x value indicated by the data of X bits in unique association with an (N/2-1)Y value of a Y symbol, and for confining use of signal points, from among the signal points of N-ary phase, only to a signal point P1 (at a phase angle 0) and N/2-2 signal points P(2n+2) (where 1?n<N/2-2). The receiver comprises a phase decoder for notifying an error detection when a signal point other than a signal point that are permitted to be used is received, and performing an error correction by changing the signal point to a signal point which has a smaller hamming distance.
    Type: Application
    Filed: January 16, 2008
    Publication date: October 2, 2008
    Inventors: Hidehiro Toyoda, Kenro Sekine, Shinya Sasaki, Shinji Nishimura
  • Patent number: 7424228
    Abstract: A communication system includes an optical transmitter which is differentially driven and an optical receiver that outputs a differential signal. The optical transmitter creates the differential drive signal from an input signal and delivers the differential drive signal to a laser. The differential drive signal is generated with a transformer and RF chokes for floating the laser above ground. The signal detected by the receiver is input as a differential signal to a transformer which then passes the signal through amplifiers and a filter. The optical communication system provides an increased spurious-free dynamic range which is well suited for RF signals and other analog signals.
    Type: Grant
    Filed: March 31, 2003
    Date of Patent: September 9, 2008
    Assignee: Lockheed Martin Corporation
    Inventors: Wilber Andrew Williams, Michael Gregory Abernathy
  • Patent number: 7379672
    Abstract: The present photonic RF generation and distribution system provides a system and method for distributing an RF output signal. The photonic RF distribution system includes two optical sources for generating optical signals. A first optical source (42) is operable to generate a first optical signal having an operating frequency. A second optical source (44) is operable to generate a second optical signal having an operating frequency. A modulator (46) is operable to impress an RF modulation signal on a tapped portion of the first optical signal such that a modulated signal is generated. A first coupler (52) combines the modulated signal with a tapped portion of the second optical signal, thereby forming a combined signal having a difference frequency component. A control photodetector (50) is responsive to the combined signal to generate a tone signal.
    Type: Grant
    Filed: February 10, 2005
    Date of Patent: May 27, 2008
    Assignee: Northrop Grumman Corporation
    Inventors: Wenshen Wang, David C. Scott, Thomas Jin-Ming Jung, Joseph Morais
  • Patent number: 7373091
    Abstract: The inventors propose herein a switch fabric architecture that allows broadcasting and fast channel access in the ns-range. In various embodiments of the present invention, 10 Gb/s receiver modules are based on a novel heterodyne receiver and detection technique, which is tolerant to moderate wavelength drifts of a local oscillator. A gain clipped electrical amplifier is used in the novel receiver as a rectifier for bandpass signal recovery.
    Type: Grant
    Filed: September 25, 2003
    Date of Patent: May 13, 2008
    Assignee: Lucent Technologies Inc.
    Inventor: Lothar Benedict Erhard Josef Moeller
  • Patent number: 7369771
    Abstract: An optical network terminator of the present invention includes an optical wavelength division multiplexer for receiving an optical signal and incoherent light. An optical detection unit converts a downstream high speed and low speed optical signals into electrical signals. A laser diode converts an upstream signal into an optical signal. A high speed driving unit is supplied with power from a power supply unit to drive a forward-biased laser diode and establish a data and video channel. A high speed reception unit is supplied with the power to receive a downstream data and video channel. A charging unit outputs charged power at the time of a power failure. A low speed driving unit is supplied with the charged power to reverse-bias the laser diode to establish a voice channel. A low speed reception unit is supplied with the charged power to receive a voice channel.
    Type: Grant
    Filed: March 23, 2006
    Date of Patent: May 6, 2008
    Assignee: Korea Advanced Institute of Science and Technology
    Inventors: Chang Hee Lee, Kwang Pyo Hong, Jin Serk Baik, Sung Man Kim, Sang Mook Lee, Sil Gu Mun
  • Patent number: 7363018
    Abstract: Described are a method and a device for high speed transmission of a data signal across an electrical interconnect in an integrated circuit. An optical carrier is modulated with a local oscillator signal at a modulation frequency substantially greater than the data signal to generate an optical local oscillator signal. Phototransducers at the ends of the interconnect illuminated by the optical local oscillator signal generate electrical local oscillator signals. At the transmit end of the interconnect, the data signal is mixed with an electrical local oscillator signal to generate an upconverted data signal. After transmission across the interconnect to the receive end, the upconverted data signal is mixed with the electrical local oscillator signal to retrieve the original data signal.
    Type: Grant
    Filed: January 18, 2005
    Date of Patent: April 22, 2008
    Assignee: Massachusetts Institute of Technology
    Inventors: Brian Tyrrell, Robert Reich
  • Patent number: 7349635
    Abstract: Method and apparatus for routing messages in a network includes first filters to provide frequency-based message signals converted from an optically-based signal and mixers adapted to mix the frequency-based message signals with sub-carriers to generate frequency-based sub-carrier modulated message signals. A frequency generator connected to the mixers provides the sub-carriers to the mixers and a combiner connected to the mixers combines the frequency-based sub-carrier modulated message signals. Second filters connected to the combiner receive and group the frequency-based sub-carrier modulated message signals. Optical transmitters connected to second filters optically convert and transmit the frequency-based sub-carrier modulated message signals. The frequency generator generates and applies a particular sub-carrier frequency to one of the mixers according to information contained in the frequency-based message signal.
    Type: Grant
    Filed: December 1, 2003
    Date of Patent: March 25, 2008
    Assignee: Lucent Technologies Inc.
    Inventors: Mooi Choo Chuah, Randy C. Giles, Xiang Liu, Muhammad A. Qureshi
  • Patent number: 7340181
    Abstract: A semiconductor device of the invention includes an integrated circuit formed on a semiconductor substrate having first and second surfaces and a notch region along the edges. The first surface includes electrical contact pads electrically connected with the integrated circuit. The first surface of the semiconductor substrate includes a top protective layer that has a surface portion extending beyond the edges of the semiconductor substrate. The second surface of the semiconductor substrate includes a bottom protective layer with electrical connectors. The surface portion of the top protective layer includes electrical contact pads that are electrically interconnected with electrical contact pad extensions. The electrical contact pad extensions are interconnected with electrical connectors via a backside electrical connector that overlaps the electrical contact pad extensions forming a lap connection. Methods for constructing such devices and connections are also disclosed.
    Type: Grant
    Filed: May 13, 2002
    Date of Patent: March 4, 2008
    Assignee: National Semiconductor Corporation
    Inventors: Ashok Prabhu, Sadanand R. Patil, Shaw Wei Lee, Alexander H. Owens
  • Patent number: 7340186
    Abstract: The discrimination phase margin monitor circuit (10) of the present invention comprises a first discrimination circuit (11 and 12) discriminating an input data signal using a clock signal extracted from the input data signal, a second discrimination circuit (13 and 14) discriminating the input data signal using a clock signal with a frequency different from that of the clock and an operation circuit (15 and 16) calculating the exclusive OR of the output signal of the first discrimination circuit and that of the second discrimination circuit and obtaining a phase margin monitor output signal by averaging the exclusive ORs.
    Type: Grant
    Filed: September 9, 2004
    Date of Patent: March 4, 2008
    Assignee: Fujitsu Limited
    Inventor: Naoki Kuwata
  • Patent number: 7340171
    Abstract: A broadcast/communication convergence system, and an FTTH (Fiber To The Home) system that can accommodate broadcast signals of various channels and variable band signals by converging broadcast and communication signals and transmitting the converged broadcast and communication signals using an IEEE 1394 transmission method serving as a standard interface in the FTTH system for broadcast/communication convergence. An OLT (Optical Line Terminal) transfers a plurality of broadcast signals and a communication signal received from external broadcast and communication providers through a single optical signal (A).
    Type: Grant
    Filed: September 9, 2004
    Date of Patent: March 4, 2008
    Assignee: Samsung Electronics Co., Ltd.
    Inventors: Kwan-Woong Song, Jeong-Rok Park, Jae-Hun Cho, Jun-Ho Koh
  • Patent number: 7302190
    Abstract: In an optical transmitting or receiving apparatus, a plurality of replaceable electro-optic converters or a plurality of replaceable opto-electric converters are provided in correspondence with optical transmission lines.
    Type: Grant
    Filed: May 29, 2002
    Date of Patent: November 27, 2007
    Assignee: Nec Corporation
    Inventors: Masataka Goto, Kenji Sato
  • Patent number: 7286767
    Abstract: A method, apparatus, and system for optical communications. An optical transmit signal is generated in response to an electrical transmit signal. The optical transmit signal is coupled into a single communication link for transmission there over. An optical receive signal is received from the single communication link, and in response an electrical receive signal is generated.
    Type: Grant
    Filed: September 30, 2003
    Date of Patent: October 23, 2007
    Assignee: Intel Corporation
    Inventors: Thorkild Franck, Eivind Johansen, Benny Christensen, Martin Lobel