Patents Examined by Merlin Brito Peguero
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Patent number: 8718481Abstract: A method and a device are provided for phase recovery of at least two channels comprising the steps of (i) a phase is estimated for each channel; (ii) the phase estimated of each channel is superimposed by a coupling factor with at least one other phase estimated. Further, a communication system is suggested comprising such a device.Type: GrantFiled: April 8, 2009Date of Patent: May 6, 2014Assignee: Xieon Networks S.A.R.L.Inventors: Fabian Hauske, Maxim Kuschnerov, Berthold Lankl, Kittipong Piyawanno, Bernhard Spinnler
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Patent number: 8705952Abstract: The present invention embraces an optical wavelength division multiplex (WDM) transmission system, especially a WDM passive optical network, typically including a central node having a first and a second WDM port and a remote node having a first and a second WDM port and a plurality of channel ports, the central node first WDM port being connected to the remote node first WDM port via a bidirectional single-fiber optical working path and the central node second WDM port being connected to the remote node second WDM port via a single-fiber bidirectional optical protection path, and a group of basic optical node units (ONU's) each of which is connected to a respective remote node channel port via a bidirectional optical ONU path, each ONU including an optical receiver for receiving a downstream optical channel signal and an optical tunable transmitter for creating an upstream channel signal.Type: GrantFiled: December 16, 2011Date of Patent: April 22, 2014Assignee: ADVA AG Optical NetworkingInventors: Klaus Grobe, Jörg-Peter Elbers, Michael Eiselt, Markus Roppelt
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Patent number: 8687983Abstract: A laser communication system and method are disclosed. The laser communication system includes a laser receiver system to receive a frequency-shift keyed (FSK) optical signal encoded with a plurality of data signals. The laser receiver system including an FSK differential detection system that includes a plurality of differential detection filters that can each receive the FSK optical signal and generate an output. The FSK differential detection system can demodulate the FSK optical signal into a multi-bit digital code corresponding to a frequency of the FSK optical signal based on the output of each of the plurality of differential detection filters.Type: GrantFiled: November 2, 2011Date of Patent: April 1, 2014Assignee: Hewlett-Packard Development Company, L.P.Inventors: Alexandre M Bratkovski, Jacob Khurgin
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Patent number: 8682161Abstract: An optical data transmission system for transmitting optical data in a flight vehicle, including a head end, optical splitter, N units of terminals that process optical data received from the optical splitter to display such as video, plural optical cables connected between the head end and the optical splitter and between the optical splitter and the terminals, and a seat group including N sets of passenger seats that transmit two-way optical data and are placed close to one another. The N units of terminals are placed in association with the respective N sets of seats. The optical splitter is placed in association with the seat group; sends optical data from the head end to the N units of terminals; and reversely unifies N-series optical data, different from one another, from the N units of terminals into one series and sends it to the head end.Type: GrantFiled: April 21, 2011Date of Patent: March 25, 2014Assignee: Panasonic CorporationInventors: Masaaki Higashida, Satoshi Ohyama
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Patent number: 8676055Abstract: A method of transmitting data using electromagnetic waves, comprising the steps of providing (101) a first electromagnetic signal (S1) having a first wavelength (?1) and a second electromagnetic signal (S2) having a second wavelength (?2) different from the first wavelength; dividing (102) each of the first (S1) and second (S2) electromagnetic signals into a first polarization component (S1x; S2x) having a first polarization direction and a second polarization component (S1y; S2y) having a second polarization direction orthogonal to the first polarization direction; modulating (103) the first polarization component (S1x) of the first electromagnetic signal (S1) to encode a first data stream (DS1); modulating (104) the second polarization component (S2y) of the second electromagnetic signal (S2) to encode a second data stream (DS2); and transmitting (105) a combined electromagnetic signal (Scomb) comprising the first and second polarization components of the first electromagnetic signal (S1) and the first andType: GrantFiled: October 29, 2010Date of Patent: March 18, 2014Assignee: Qamcom Technology ABInventors: Erik Agrell, Martin Sjodin
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Patent number: 8660425Abstract: There is provided an optical transmitting device including a detector to detect a transmission rate of a transmission signal, a transmission method selector to determine a transmission method of the transmission signal, based on the transmission rate detected by the detector, a modulation signal generator circuit to generate a modulation signal from the transmission signal, based on the transmission method determined by the transmission method selector, and an optical modulator to generate a modulated optical signal from the modulation signal generated by the modulation signal generator circuit.Type: GrantFiled: May 4, 2011Date of Patent: February 25, 2014Assignee: Fujitsu LimitedInventor: Yasuhiko Aoki
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Patent number: 8649687Abstract: The invention relates to a method in a transmitting node for transmitting a modulated optical carrier signal over an optical channel in an optical communications network to a receiving node. The method enables full use of the polarization domain within a Poincaré sphere when modulating the optical carrier signal.Type: GrantFiled: May 6, 2011Date of Patent: February 11, 2014Assignee: Telefonaktiebolaget L M Ericsson (publ)Inventor: Anders Djupsjöbacka
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Patent number: 8644715Abstract: A method and a device for monitoring and controlling a phase difference based on DQPSK modulation are provided, and the method includes: performing the nth power multiplication operation respectively on a first differential current signal and a second differential current signal output after DQPSK demodulation to correspondingly obtain a first monitor signal and a second monitor signal, where, n is a positive integral multiple of 4; monitoring phase differences between respectively two arms of a first demodulator according to the first monitor signal and two arms of a second demodulator according to the second monitor signal; adjusting the phase differences between respectively two arms of the first demodulator and two arms of the second demodulator using the monitor result, so that the differences can meet demodulation requirements and a receiver can obtain transmitted information.Type: GrantFiled: June 9, 2010Date of Patent: February 4, 2014Assignee: ZTE CorporationInventor: Gong Li
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Patent number: 8611749Abstract: A reconfigurable optical switching device comprising a Tunable Filters Array (TFA) unit incorporating tunable optical filters, wherein the arrangement is such that one and the same TFA unit is utilized both for performing a drop function of the device in a colorless and reconfigurable manner, and a through function of the device in a reconfigurable manner.Type: GrantFiled: November 2, 2011Date of Patent: December 17, 2013Assignee: ECI Telecom Ltd.Inventors: Avi Levy, Eyal Lichtman
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Patent number: 8611743Abstract: Methods and systems for optical signal grooming that include providing one or more input signals, each having one or more modulated subcarriers, to a grooming processor; and grooming the input signals at a subcarrier level with the grooming processor to produce one or more output signals by arranging the modulated subcarriers in the output signals according to a grooming operation such that the modulated subcarriers are not demodulated or decoded prior to grooming.Type: GrantFiled: December 6, 2011Date of Patent: December 17, 2013Assignee: NEC Laboratories America, Inc.Inventors: Philip N. Ji, Dayou Qian, Ankitkumar N. Patel, Ting Wang, Yoshiaki Aono
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Patent number: 8577225Abstract: Provided is an optical receiver which accurately demodulates an optical signal obtained by the differential phase shift modulation method. The optical receiver includes: an interferometer which branches the inputted optical signal into two parts and gives a one-bit phase difference to the resultant two optical signals so that the two optical signals after addition of the phase difference are made to interfere each other to output two output lights; reflection means which reflects one of the output lights from the interferometer so as to return to the interferometer; detection means which detects the return light which has been reflected by the reflection means and propagates through the interferometer in the different direction from the inputted optical signal, for output; and phase difference control means which adjusts the phase difference given by the interferometer according to the intensity of the return light detected by the detection means.Type: GrantFiled: March 25, 2009Date of Patent: November 5, 2013Assignee: Sumitomo Osaka Cement Co., Ltd.Inventors: Masahito Mure, Norikazu Miyazaki, Toshio Kataoka, Kaoru Higuma
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Patent number: 8565615Abstract: An optical modulation apparatus includes a first modulator, a second modulator, a multiplexer, a detector and an adjustor. The first modulator modulates light emitted by a light source using a first input signal and outputs a first modulated signal. The second modulator modulates the light using a second input signal and outputs a second modulated signal. The multiplexer multiplexes the first and second modulated signals and outputs a multiplexed signal. The detector is configured to detect a dip where power in a waveform of the multiplexed signal is equal to or smaller than a predetermined value. The adjustor is configured to adjust a delay of the first and second input signals based on power at the dip.Type: GrantFiled: March 15, 2011Date of Patent: October 22, 2013Assignee: Fujitsu LimitedInventors: Masato Nishihara, Tomoo Takahara, Takeshi Hoshida
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Patent number: 8543006Abstract: A method is provided for reducing polarization dependent loss experienced by an optical signal comprises monitoring a power level of a polarization multiplexed optical signal. The method further comprises detecting a power spike based on the monitored power. The power spike is induced by misalignment of a polarization component axis of the optical signal with a polarization dependent loss (PDL) axis of one or more network elements. The method further comprises rotating the polarization orientation of the optical signal such that the power spike is reduced.Type: GrantFiled: September 10, 2010Date of Patent: September 24, 2013Assignee: Fujitsu LimitedInventors: Olga I Vassilieva, Youichi Akasaka
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Patent number: 8543004Abstract: In one aspect, the present invention embraces a wavelength locking method for causing a narrow-band wavelength spectrum of an optical transmit signal of an optical transceiver device to track a narrow-band wavelength spectrum of an optical receive signal received by the optical transceiver device Further, the present invention embraces a wavelength lockable optical transceiver device, especially for a passive optical transmission network, using this wavelength locking method.Type: GrantFiled: December 16, 2011Date of Patent: September 24, 2013Assignee: ADVA Optical Networking SEInventor: Michael Eiselt
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Patent number: 7380708Abstract: A method for providing secure document distribution is disclosed.Type: GrantFiled: March 18, 2005Date of Patent: June 3, 2008Assignee: Pisafe, Inc.Inventor: Han Kiliccote
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Patent number: 7344077Abstract: The present invention has been made to adequately and quickly adjust the spherical aberration and focus bias in an optical pickup. In the present invention, evaluation values are measured on a plurality of respective measurement points each determined by a combination of a spherical aberration correction value and focus bias value and a two-variable function having the spherical aberration correction value and focus bias value as variables is approximated to the evaluation values. Based on the two-variable function obtained by the approximation, the optimal value of the spherical aberration correction value and focus bias value on which the evaluation value becomes optimal is calculated. As a result, it is possible to adequately and quickly adjust the spherical aberration and focus bias in an optical pickup.Type: GrantFiled: December 30, 2005Date of Patent: March 18, 2008Assignee: Sony CorporationInventors: Seiichi Sagara, Atsushi Ishimaru