Power Patents (Class 398/38)
  • Patent number: 10439731
    Abstract: In some embodiments, an apparatus includes a processor configured to receive a set of digital samples associated with a set of optical signals received at a coherent optical receiver. The set of digital samples is associated with a set of optical channels. Each optical channel from the set of optical channels is spaced from at least one adjacent optical channel from the plurality of optical channels. The processor is configured to calculate, for each optical channel from the set of optical channels, a spacing between that optical channel and at least one adjacent optical channel from the set of optical channels based on digital signal processing of the set of digital samples. The processor is configured to send a signal indicating, for each optical channel from the set of optical channels, the spacing between that optical channel and the at least one adjacent optical channel.
    Type: Grant
    Filed: September 28, 2018
    Date of Patent: October 8, 2019
    Assignee: Juniper Networks, Inc.
    Inventors: Massimiliano Salsi, Xiaoxia Wu
  • Patent number: 10416040
    Abstract: Characterizing a first OLTS includes connecting a first test cable directly to a second power meter of the first OLTS, connecting the first test cable to a second test cable, and connecting the second test cable directly to a connection port of a second OLTS. The method also includes determining a first characterization power of the first OLTS by measuring an optical power of light transmitted from a light source of the second OLTS with the second power meter of the first OLTS. The method further includes disconnecting a first test cable from the second power meter of the first OLTS, connecting the first test cable directly to a connection port of the first OLTS, and determining a second characterization power of the first OLTS by measuring an optical power of light transmitted from the light source of the second OLTS with the first power meter of the first OLTS.
    Type: Grant
    Filed: July 5, 2018
    Date of Patent: September 17, 2019
    Assignee: AFL Telecommunications LLC
    Inventors: Scott Prescott, Bin Liu
  • Patent number: 10340979
    Abstract: In accordance with the present disclosure, a communication network includes a surface wave transceiver, mounted on a medium voltage power line, configured to bidirectionally communicate wireless network data via guided electromagnetic waves that propagate along a surface of the medium voltage power line. A plurality of analog surface wave repeater pairs, a plurality of digital surface wave regenerator pairs, are mounted on the medium voltage power line. A plurality of access points, supported by corresponding ones of a plurality of utility poles that also support the medium voltage power line, is configured to wirelessly transmit the wireless network data to a plurality of client devices in accordance with a wireless network protocol and to wirelessly receive client data from the plurality of client devices in accordance with the wireless network protocol. A plurality of surface wave add/drop multiplexer pairs, is also mounted on the medium voltage power line.
    Type: Grant
    Filed: March 26, 2018
    Date of Patent: July 2, 2019
    Assignee: AT&T Intellectual Property I, L.P.
    Inventors: Farhad Barzegar, Irwin Gerszberg, Thomas M. Willis, III, Paul Shala Henry, Robert Bennett, Donald J. Barnickel, Giovanni Vannucci
  • Patent number: 10333617
    Abstract: A data rate at which data can be transmitted is adapted in real-time to power fluctuations. Bits of data to be sent by a transmitter are mapped to physical symbols, where a first modulation uses a first number of bits per pulse and a second modulation uses a second number of bits per pulse. Both modulations are sent, with one nested inside the other. A receiver decodes one or both bit streams, depending on a signal to noise ratio (SNR). In this regard, the data rate traces the received power, and higher data rates may be used despite periods of power fluctuations. This technique enables rapid, or even instantaneous, changes by using nested modulation. Moreover, a fast feedback mechanism is used to inform the transmitter when to change its modulation and to retransmit bits lost during an initial transmission.
    Type: Grant
    Filed: June 26, 2017
    Date of Patent: June 25, 2019
    Assignee: X DEVELOPMENT LLC
    Inventors: Bruce Moision, Baris Erkmen, Devin Brinkley
  • Patent number: 10326495
    Abstract: In accordance with one or more embodiments, a communication network includes a surface wave transceiver, mounted on a coaxial cable of a broadband cable network, configured to bidirectionally communicate wireless network data via guided electromagnetic waves that propagate along a surface of the coaxial cable. A plurality of analog surface wave repeater pairs, and a plurality of digital surface wave regenerator pairs, are also mounted on the coaxial cable. A plurality of access points, supported by corresponding ones of a plurality of utility poles that also support the coaxial cable, is configured to wirelessly transmit the wireless network data to a plurality of client devices in accordance with a wireless network protocol and to wirelessly receive client data from the plurality of client devices in accordance with the wireless network protocol. A plurality of surface wave add/drop multiplexer pairs, is also mounted on the coaxial cable.
    Type: Grant
    Filed: March 26, 2018
    Date of Patent: June 18, 2019
    Assignee: AT&T Intellectual Property I, L.P.
    Inventors: Farhad Barzegar, Irwin Gerszberg, Thomas M. Willis, III, Paul Shala Henry, Robert Bennett, Donald J. Barnickel, Giovanni Vannucci
  • Patent number: 10298322
    Abstract: In some embodiments, a non-transitory processor-readable medium storing code representing instructions to be executed by a processor comprises code to cause the processor to determine, during a calibration of a coherent optical transmitter, a set of parameters associated with each tributary channel by sending a first signal to a digital signal processor (DSP) to adjust a scale factor of that tributary channel. The scale factor is associated with a tap characteristic of a finite impulse response (FIR) filter of the DSP. The code further causes the processor to determine a power imbalance between two tributary channels based on the set of parameters associated with each tributary channel. The code further causes the processor to send a second signal to the coherent optical transmitter to adjust a set of operational settings of the coherent optical transmitter based on the power imbalance and the set of parameters associated with each tributary channel.
    Type: Grant
    Filed: April 27, 2018
    Date of Patent: May 21, 2019
    Assignee: Juniper Networks, Inc.
    Inventors: Qiang Wang, Yang Yue, Xuan He
  • Patent number: 10281300
    Abstract: The disclosure relates to distributed optical fiber sensors arranged to detect coherent Rayleigh backscatter from a sensing optical fiber disposed in an environment, and to determine an infrasonic signal in the backscatter, or to determine a change in the environment within an infrasonic frequency range from the backscatter.
    Type: Grant
    Filed: April 26, 2016
    Date of Patent: May 7, 2019
    Assignee: Fotech Solutions Limited
    Inventor: Vincent Handerek
  • Patent number: 10250948
    Abstract: Systems and methods for using optical narrowcasting with social media applications are described herein. One system may include an optical receiver to receive optically narrowcast content extracted from an optical beam transmitted by an optical transmitter; and a first user device to capture a media representation of a real-world environment in which the optical beam is detected. The system may be configured to create an enhanced media dataset including the optically narrowcast content and the media representation; and post the enhanced media dataset on a social media platform. The system may set one or more filters to be applied to optically narrowcast content posted on the social media platform; and apply the one or more filters to the optically narrowcast content of the enhanced media dataset that is posted on the social media platform.
    Type: Grant
    Filed: February 9, 2018
    Date of Patent: April 2, 2019
    Assignee: ARON SUREFIRE, LLC
    Inventors: John C. Bortz, Narkis E. Shatz
  • Patent number: 10247601
    Abstract: A method for monitoring radiation by an optical sensor which generates a signal, such as a shut-off signal, which influences the radiation when subjected to radiation. A sensor with dark current pulses is used, which are assessed as a functional capability signal of the sensor.
    Type: Grant
    Filed: October 19, 2015
    Date of Patent: April 2, 2019
    Assignee: KUKA DETUSCHLAND GMBH
    Inventors: Ansgar Schäfer, Lars Soeren Ott, Klaus R Goebel
  • Patent number: 10197884
    Abstract: Electro-optical modulators and methods of fabrication are disclosed. An electro-optical modulator includes a Mach-Zehnder interferometer containing an intrinsic silicon layer semiconductor layer and a coplanar waveguide. Signals from the coplanar waveguide are capacitively coupled to the Mach-Zehnder interferometer through first and second dielectric layers.
    Type: Grant
    Filed: July 13, 2017
    Date of Patent: February 5, 2019
    Assignee: The Regents of the University of California
    Inventor: Nadir Dagli
  • Patent number: 10164708
    Abstract: A method for determining receiver coupling efficiency includes varying optical power inputted into a half active optical cable to determine a maximum optical power at which the TIA squelches and determining a receiver coupling efficiency by calculating a ratio of a threshold optical power to the maximum optical power at which the TIA squelches. A method of determining link loss in a channel includes varying optical power of a light source to determine the maximum optical power at which the TIA squelches and determining the link loss in the channel by subtracting the maximum optical power from the threshold optical power. A method of determining link topology includes selecting a pattern of optical powers and matching a pattern of squelched and non-squelched outputs with the pattern of optical power. An active optical cable includes memory storing a value related to an initial link loss of the active optical cable.
    Type: Grant
    Filed: September 26, 2018
    Date of Patent: December 25, 2018
    Assignee: SAMTEC, INC.
    Inventors: Joshua R. Cornelius, Eric J. Zbinden, William J. Kozlovsky, David A. Langsam
  • Patent number: 10153926
    Abstract: Disclosed are a frequency offset estimation method and apparatus in an optical transmission network and a storage medium. The method comprises: acquiring a data symbol to be frequency offset estimated, and eliminating a noise phase, a phase generated by a light source and an information phase in the data symbol to be frequency offset estimated; and performing a correlation operation on a data symbol with a set interval in the data symbol after the elimination processing and using a correlation operation result to determine a frequency offset estimation value.
    Type: Grant
    Filed: September 12, 2014
    Date of Patent: December 11, 2018
    Assignee: SANECHIPS TECHNOLOGY CO.,LTD.
    Inventor: Qiuyan Lu
  • Patent number: 10142027
    Abstract: A communication device of the disclosure includes: a first terminal that outputs a power supply voltage; a second terminal coupled directly or indirectly to the first terminal; a communication section that operates on a basis of the power supply voltage to communicate with a communication peer; and a communication controller that sets the communication section to be in an ON state or in an OFF state on a basis of a voltage on the second terminal.
    Type: Grant
    Filed: March 3, 2016
    Date of Patent: November 27, 2018
    Assignee: Sony Corporation
    Inventors: Toshihisa Hyakudai, Masanari Yamamoto
  • Patent number: 10122472
    Abstract: An optical receiver that recovers data is disclosed. The optical receiver includes a photodetector configured to convert an optical signal into a current signal, and a TIA (Transimpedance Amplifier) configured to operate according to a set of parameters to convert the current signal to a voltage signal. The optical receiver also includes an equalizer configured to process the voltage signal to produce a processed signal having recovered data from the optical signal, and to produce one or more equalization metrics. According to an embodiment of the disclosure, the optical receiver has a feedback processor configured to automatically tune operation of the TIA by adjusting at least one of the parameters of the TIA based on the one or more equalization metrics. This may effect a change in performance or power consumption of the optical receiver while receiving and recovering data. A corresponding method for recovering data is also disclosed.
    Type: Grant
    Filed: June 28, 2016
    Date of Patent: November 6, 2018
    Assignee: INPHI CORPORATION
    Inventors: Kevin Parker, Lawrence Tse, Kenji Suzuki, Brian Wall, Stephane Dallaire, Florin Pera
  • Patent number: 10116386
    Abstract: A method for determining receiver coupling efficiency includes varying optical power inputted into a half active optical cable to determine a maximum optical power at which the TIA squelches and determining a receiver coupling efficiency by calculating a ratio of a threshold optical power to the maximum optical power at which the TIA squelches. A method of determining link loss in a channel includes varying optical power of a light source to determine the maximum optical power at which the TIA squelches and determining the link loss in the channel by subtracting the maximum optical power from the threshold optical power. A method of determining link topology includes selecting a pattern of optical powers and matching a pattern of squelched and non-squelched outputs with the pattern of optical power. An active optical cable includes memory storing a value related to an initial link loss of the active optical cable.
    Type: Grant
    Filed: October 13, 2017
    Date of Patent: October 30, 2018
    Assignee: SAMTEC, INC.
    Inventors: Joshua R. Cornelius, Eric J. Zbinden, William J. Kozlovsky, David A. Langsam
  • Patent number: 10038498
    Abstract: Apparatus and method for transmitter alignment in an optical communication system are provided. In certain configurations, a method of correcting for transmitter skew is provided. The method includes generating an optical signal using a transmitter based on an in-phase (I) component and a quadrature-phase (Q) component of a transmit signal, the optical signal having a baud rate that is based on a timing tone. The method further includes receiving the optical signal as an input to a receiver, and generating a signal vector representing the optical signal using the receiver. The signal vector includes an I component and a Q component. The method further includes calculating a power of the timing tone based on processing the signal vector using a tone power calculator of the receiver, and correcting for a skew of the transmitter based on the calculated power.
    Type: Grant
    Filed: September 2, 2016
    Date of Patent: July 31, 2018
    Assignee: INPHI CORPORATION
    Inventors: Shu Hao Fan, Damian Alfonso Morero, Mario Rafael Hueda
  • Patent number: 9979472
    Abstract: In some embodiments, a non-transitory processor-readable medium storing code representing instructions to be executed by a processor comprises code to cause the processor to determine, during a calibration of a coherent optical transmitter, a set of parameters associated with each tributary channel by sending a first signal to a digital signal processor (DSP) to adjust a scale factor of that tributary channel. The scale factor is associated with a tap characteristic of a finite impulse response (FIR) filter of the DSP. The code further causes the processor to determine a power imbalance between two tributary channels based on the set of parameters associated with each tributary channel. The code further causes the processor to send a second signal to the coherent optical transmitter to adjust a set of operational settings of the coherent optical transmitter based on the power imbalance and the set of parameters associated with each tributary channel.
    Type: Grant
    Filed: December 29, 2016
    Date of Patent: May 22, 2018
    Assignee: Juniper Networks, Inc.
    Inventors: Qiang Wang, Yang Yue, Xuan He
  • Patent number: 9871582
    Abstract: A method for performing optical channel telemetry. The method may include generating various channel estimates of an optical channel, wherein the channel estimates are generated by an optical detector. The method may further include determining, from the channel estimates, various channel properties regarding the optical channel. The method may further include determining, using a summarization function and the channel properties, a channel summary that describes a portion of the optical channel during a predetermined period of time. The predetermined period of time corresponds to a processor interval of a computer processor. The method may further include transmitting, over a network, the channel summary to an optical network controller.
    Type: Grant
    Filed: December 4, 2015
    Date of Patent: January 16, 2018
    Assignee: Cienna Corporation
    Inventors: Petar Djukic, David Cote
  • Patent number: 9847837
    Abstract: An optical line termination includes a detection circuit configured to detect a sleep request from a control apparatus to base stations; a determination circuit configured to determine, when the detection circuit detects the sleep request, whether processing of turning the base stations of requestees by the sleep request into a sleep state in accordance with the sleep request is approvable or not, based on a shortage bandwidth within a passive optical network in a different one of the base stations having a predetermined relationship with the requested base station; and a control circuit configured to discard the sleep request when the determination circuit determines that the processing is not approvable, or transfer the sleep request to the base station of the different requestee when the determination circuit determines that the processing is approval.
    Type: Grant
    Filed: December 2, 2016
    Date of Patent: December 19, 2017
    Assignee: FUJITSU LIMITED
    Inventors: Kyosuke Sone, Yasuhiko Aoki
  • Patent number: 9824055
    Abstract: A control method applied to an Operating-Mode Finite-State-Machine (OPFSM) arranged for deciding a behavior of a first port of an apparatus includes: controlling the OPFSM to enter a second local state from a first local state and controlling the first port to send a signal with a wakeup pattern to a link partner of the first port when the state of the OPFSM is the first local state, and a wakeup request bit is a first local value.
    Type: Grant
    Filed: March 12, 2015
    Date of Patent: November 21, 2017
    Assignee: Realtek Semiconductor Corp.
    Inventors: Hsuan-Ting Ho, Liang-Wei Huang, Ching-Yao Su, Sheng-Fu Chuang
  • Patent number: 9819413
    Abstract: A method for determining receiver coupling efficiency includes varying optical power inputted into a half active optical cable to determine a maximum optical power at which the TIA squelches and determining a receiver coupling efficiency by calculating a ratio of a threshold optical power to the maximum optical power at which the TIA squelches. A method of determining link loss in a channel includes varying optical power of a light source to determine the maximum optical power at which the TIA squelches and determining the link loss in the channel by subtracting the maximum optical power from the threshold optical power. A method of determining link topology includes selecting a pattern of optical powers and matching a pattern of squelched and non-squelched outputs with the pattern of optical power. An active optical cable includes memory storing a value related to an initial link loss of the active optical cable.
    Type: Grant
    Filed: February 17, 2017
    Date of Patent: November 14, 2017
    Assignee: SAMTEC, INC.
    Inventors: Joshua R. Cornelius, Eric J. Zbinden, William J. Kozlovsky, David A. Langsam
  • Patent number: 9722704
    Abstract: An optical transmission apparatus includes: an optical receiver configured to receive an optical signal; a variable optical attenuator configured to adjust a power of the optical signal to be input to the optical receiver according to a variable attenuation amount; and a controller configured to control the attenuation amount of the variable optical attenuator based on an electrical signal obtained by performing a coherent detection and a photoelectric conversion on the optical signal received by the optical receiver.
    Type: Grant
    Filed: February 1, 2016
    Date of Patent: August 1, 2017
    Assignee: FUJITSU LIMITED
    Inventors: Taku Saito, Kosuke Komaki, Taketo Endo, Shuzo Matsushita, Hirofumi Araki, Hiroshi Nishida, Makoto Shimizu
  • Patent number: 9698900
    Abstract: Disclosed herein are an optical network unit and a method for controlling the unit. In a passive optical network system, an optical transceiver of the optical network unit performs a wavelength change of an optical signal according to a wavelength setting command transferred from a media access control (MAC) unit and monitors a wavelength change state and reports the monitored wavelength change state to the MAC unit. When the wavelength malfunction occurs, the MAC unit blocks an uplink optical transmission of the optical transceiver.
    Type: Grant
    Filed: April 29, 2016
    Date of Patent: July 4, 2017
    Assignee: ELECTRONICS AND TELECOMMUNICATIONS RESEARCH INSTITUTE
    Inventors: Hark Yoo, Yongseok Yoo, Geun Yong Kim, Dongsoo Lee
  • Patent number: 9647793
    Abstract: A measuring device includes an identifying unit configured to identify a design value of a central frequency of spectrum of an optical signal for each of sub-channels, the optical signal being formed in Nyquist pulse, the sub-channels forming a super-channel in wavelength division multiplexing communication; and a measurer configured to measure the power of the optical signal in a band for each of the sub-channels, the identified design value of the central frequency of the band being a central frequency of the band, the band being narrower than a frequency band of a corresponding one of the sub-channels.
    Type: Grant
    Filed: April 23, 2015
    Date of Patent: May 9, 2017
    Assignee: FUJITSU LIMITED
    Inventor: Takehiro Fujita
  • Patent number: 9638874
    Abstract: A method for determining receiver coupling efficiency includes varying optical power inputted into a half active optical cable to determine a maximum optical power at which the TIA squelches and determining a receiver coupling efficiency by calculating a ratio of a threshold optical power to the maximum optical power at which the TIA squelches. A method of determining link loss in a channel includes varying optical power of a light source to determine the maximum optical power at which the TIA squelches and determining the link loss in the channel by subtracting the maximum optical power from the threshold optical power. A method of determining link topology includes selecting a pattern of optical powers and matching a pattern of squelched and non-squelched outputs with the pattern of optical power. An active optical cable includes memory storing a value related to an initial link loss of the active optical cable.
    Type: Grant
    Filed: October 16, 2015
    Date of Patent: May 2, 2017
    Assignee: SAMTEC, INC.
    Inventors: Joshua R. Cornelius, Eric Jean Zbinden, William J. Kozlovsky, David A. Langsam
  • Patent number: 9596031
    Abstract: A system for powering a network element of a fiber optic wide area network is disclosed. When communication data is transferred between a central office (CO) and a subscriber terminal using a network element to convert optical to electrical (O-E) and electrical to optical (E-O) signals between a fiber from the central office and twisted wire pair, coaxial cable or Ethernet cable transmission lines from the subscriber terminal, techniques related to local powering of a network element or drop site by the subscriber terminal or subscriber premise remote powering device are provided. Certain advantages and/or benefits are achieved using the present invention, such as freedom from any requirement for additional meter installations or meter connection charges and does not require a separate power network.
    Type: Grant
    Filed: September 12, 2013
    Date of Patent: March 14, 2017
    Inventors: Alexander Ivan Soto, Walter Glen Soto
  • Patent number: 9577763
    Abstract: Spectrum control systems and methods are implemented to minimize power spectral density (PSD) offsets by adjusting gain of optical amplifiers in an optical section. The optical section is a logical boundary from one optical signal access point to a next adjacent optical signal access point. The systems and methods include estimating PSD offset from a given target for a peak channel at each span in the optical section, wherein the estimated PSD offset is divided at each span into two components including a self-introduced offset and an uncompensated offset from upstream; generating, for each span, a separate controller response for the self-introduced offset and the uncompensated offset from upstream; and controlling the gain of the optical amplifiers based on the separate controller response for the self-introduced offset and the uncompensated offset from upstream, for each span.
    Type: Grant
    Filed: April 22, 2015
    Date of Patent: February 21, 2017
    Assignee: Ciena Corporation
    Inventors: Choudhury A. Al Sayeed, David C. Bownass, David W. Boertjes, Shiyu Gao
  • Patent number: 9432113
    Abstract: An optical transmission device including a wavelength selective switch including plural output ports, an optical intensity monitoring device that receives each optical signal output from the plural output ports of the wavelength selective switch and monitors the optical intensity of the optical signals, and a controller that controls optical intensity of the optical signals from the plural output ports of the wavelength selective switch based on the optical intensities monitored by the optical intensity monitoring device.
    Type: Grant
    Filed: December 10, 2014
    Date of Patent: August 30, 2016
    Assignee: FUJITSU LIMITED
    Inventors: Hiroki Oi, Kosuke Komaki
  • Patent number: 9276694
    Abstract: A system and method for fault recovery in a branched optical network. In response to a fault, power distribution in channels on recovering digital line segments is adjusted to minimize a merit function based on one or more system parameters.
    Type: Grant
    Filed: March 15, 2013
    Date of Patent: March 1, 2016
    Assignee: TYCO ELECTRONICS SUBSEA COMMUNICATIONS LLC
    Inventors: Hongsheng Wang, Dmitriy Kovsh, Lutfur Rahman, Ruomei Mu
  • Patent number: 9246590
    Abstract: An optical transceiver includes an electric terminal that can receive power from a host equipment and provide a power supply voltage to the optical transceiver, and a power failure monitor circuit that can detect an imminent loss of the power supply voltage. The power failure monitor circuit can produce a dying-gasp control signal when such imminent loss of power supply voltage is detected or when a disabling control signal is received from the host equipment. A driver can receive the dying-gasp control signal. An optical transmitter is powered by the power supply voltage and can emit a first optical signal under the control of the driver. The driver can modulate an envelope of the first optical signal in response to the dying-gasp control signal to produce a modulated envelope comprising a first dying gasp signal.
    Type: Grant
    Filed: February 22, 2009
    Date of Patent: January 26, 2016
    Assignee: FINISAR CORPORATION
    Inventors: Wen Li, Fulin Pan, Jianhui Zhou
  • Patent number: 9197506
    Abstract: A system and method for Service Interoperability in Ethernet Passive Optical Network (SIEPON) energy saving statistics. Energy saving statistics can be collected from a plurality of subordinate nodes in a point-to-multipoint network through a mechanism that aggregates energy saving statistics as those energy saving statistics are reported upstream. Such aggregation of energy saving statistics can be advantageous in that the aggregated energy saving information can appear uncorrelated to individual subordinate nodes. Privacy concerns are thereby addressed.
    Type: Grant
    Filed: December 31, 2012
    Date of Patent: November 24, 2015
    Assignee: BROADCOM CORPORATION
    Inventors: Wael William Diab, Ryan Hirth, Lowell D. Lamb, Glen Kramer
  • Patent number: 9190809
    Abstract: A method and apparatus for active voltage regulation in optical modules utilize a voltage regulator to change the supply voltage provided to laser diode driver and receiver electronics to optimize module performance over temperature. The ambient temperature of the module is monitored. The outputs of the voltage regulator are controlled to provide voltages that are optimized with respect to temperature for the integrated circuits in the optical module. This control is implemented via a temperature sensitive feedback or a control input from a microcontroller with a temperature monitor input. The supply voltage is optimized to minimize the voltage required to achieve acceptable performance at a given temperature. Minimizing the supply voltage lengthens the lifetime of the integrated circuit and the optical module. The voltage regulator provides higher than standard supply voltages to a laser diode driver to compensate for higher laser voltage at low temperatures.
    Type: Grant
    Filed: December 19, 2013
    Date of Patent: November 17, 2015
    Assignee: Zephyr Photonics Inc.
    Inventor: Duane Louderback
  • Patent number: 9071350
    Abstract: An optical receiver able to distinguish a failure occurred in one of multiplexed signals from a failure in the transmission medium is disclosed. The optical receiver includes an optical de-multiplexer, optical devices, a signal processor, and a controller. Each of the optical devices converts the de-multiplexed signal into an electrical signal. A clock is extracted from one of the electrical signals. The processor decides, based on the electrical signals and the clock, one of the multiplexed signals falls in a failure.
    Type: Grant
    Filed: April 19, 2013
    Date of Patent: June 30, 2015
    Assignee: Sumitomo Electric Industries, Ltd.
    Inventor: Hirotaka Oomori
  • Patent number: 9065663
    Abstract: The present invention provide a method for forwarding a multicast program includes: receiving a multicast join request message requesting an on-demand program from a user; obtaining forwarding decision information according to the multicast join request message; determining a decision result corresponding to the forwarding decision information according to the forwarding decision information and forwarding relation data, where the decision result is forwarding according to PON replication or forwarding according to user replication, the forwarding relation data includes data elements indicating correspondence between various types of forwarding decision information and various types of forwarding modes, and the various types of forwarding modes include the forwarding according to PON replication and the forwarding according to user replication; and forwarding the on-demand program to the user according to the decision result.
    Type: Grant
    Filed: January 28, 2014
    Date of Patent: June 23, 2015
    Assignee: HUAWEI TECHNOLOGIES CO., LTD.
    Inventors: Ming Wei, Bin Huang
  • Patent number: 9042685
    Abstract: This invention concerns real-time multi-impairment signal performance monitoring. In particular it concerns an optical device, for instance a monolithic integrated photonics chip, comprising a waveguide having an input region to receive a signal for characterization, and a narrow band CW laser signal. A non-linear waveguide region to mix the two received signals. More than one output region, each equipped with bandpass filters that extract respective discrete frequency bands of the RF spectrum of the mixed signals. And, also comprising (slow) power detectors to output the extracted discrete frequency banded signals.
    Type: Grant
    Filed: June 20, 2011
    Date of Patent: May 26, 2015
    Assignee: The University of Sydney
    Inventors: Trung Duc Vo, William Peter Corcoran, Mark David Pelusi, David James Moss, Benjamin John Eggleton, Jochen Bernhard Schroeder
  • Patent number: 9042737
    Abstract: In the present invention, wasted power consumption caused when a clock and data recovery unit in an optical network unit in a PON system is activated from a power-saving state is reduced and rapid, secure communication is performed. A clock and data recovery unit includes a phase-locked loop that can be set to normal mode or power-saving mode and that includes a voltage-controlled oscillator and recovers a clock signal and a data signal from input signals. The clock and data recovery unit includes a reference clock multiplier circuit that multiplies a reference clock signal and outputs the multiplied reference clock signal; and a frequency training loop that includes the same voltage-controlled oscillator and performs synchronous oscillation training by the voltage-controlled oscillator using the reference clock multiplier circuit before the phase-locked loop transitions from power-saving mode to normal mode.
    Type: Grant
    Filed: February 21, 2012
    Date of Patent: May 26, 2015
    Assignee: SUMITOMO ELECTRIC INDUSTRIES, LTD.
    Inventor: Naruto Tanaka
  • Patent number: 9042725
    Abstract: The present invention refers to a method for adjusting power levels of channels (15) in an optical link (7) of an optical network comprising at least one optical amplifier (9) wherein the power distribution among the channels (15) of the optical link (7) is achieved in function of: target power levels based on the features of corresponding connections and of link physical features, total available power in said at least one amplifier (9), features of control means allowing the power distribution, and wherein for a channel corresponding to a connection having a higher vulnerability characterizing parameter, the tolerated difference between an actual channel power level and the target power level is lower than for a channel corresponding to a connection having a lower vulnerability characterizing parameter.
    Type: Grant
    Filed: May 6, 2010
    Date of Patent: May 26, 2015
    Assignee: Alcatel Lucent
    Inventors: Pierre Peloso, Eric Fabre, Pascal Pecci
  • Patent number: 9025953
    Abstract: The present invention discloses a method and a device for detecting a signal power, and belongs to the field of communications. The method includes: when a receiver converts a received receive signal and outputs an output signal, separating a direct current signal and an alternating current signal from the output signal; converting the direct current signal into a first analog voltage signal; converting the alternating current signal into a second analog voltage signal through a transimpedance amplifier TIA; and obtaining a power of the receive signal according to the first analog voltage signal and the second analog voltage signal. The device includes: a first separating module, a first converting module, and an obtaining module. The present invention can improve accuracy of detecting a signal power.
    Type: Grant
    Filed: February 6, 2013
    Date of Patent: May 5, 2015
    Assignee: Huawei Technologies Co., Ltd.
    Inventors: Zhenwei Cui, Zongwang Wang, Min Lian, Jing Wang
  • Publication number: 20150117858
    Abstract: A method, a controller, and an optical section include performing an analysis to determine an amount of power offset on any in-service channels in an optical section due to a capacity change with a channel; defining a step size to ensure the capacity change does not exceed an offset limit based on the analysis; performing the capacity change in one or more iterations using the step size to limit the capacity change; and performing an optimization between each of the one or more iterations to adjust amplifier gains in the optical section to compensate for offsets on the in-service channels caused by a previous iteration.
    Type: Application
    Filed: October 31, 2013
    Publication date: April 30, 2015
    Applicant: CIENA CORPORATION
    Inventors: Choudhury A. AL SAYEED, Mohammad Mehdi Mansouri Rad, Dave C. BOWNASS, Loren S. BERG
  • Patent number: 9020337
    Abstract: A local oscillation light source outputs locally-oscillated light. An light receiving unit phase-separates an input optical signal by making the optical signal interfere with the locally-oscillated light and outputs an analog electric signal corresponding to the phase-separated optical signal. An analog-to-digital converting unit converts the analog electric signal into a digital signal. A processing unit performs digital signal processing by using the digital signal. A failure detection unit determines whether or not the optical signal is being input to the light receiving unit, or detects a failure in the light receiving unit, the analog-to-digital converting unit or the processing unit based on light intensity of the optical signal, whether or not the analog electric signal can be generated in the light receiving unit, and an amplitude of the analog electric signal output from the light receiving unit.
    Type: Grant
    Filed: June 14, 2013
    Date of Patent: April 28, 2015
    Assignee: NEC Corporation
    Inventor: Takashi Tsubouchi
  • Patent number: 9021086
    Abstract: System and methods for inferring network topology are described, including a method comprising determining a normalized transmit power of a first device, identifying a second device based upon a parameter of the second device and the normalized transmit power of the first device, and generating a topology including the first device and the second device based upon at least one of the normalized transmit power of the first device and the parameter of the second device.
    Type: Grant
    Filed: October 21, 2011
    Date of Patent: April 28, 2015
    Assignee: Comcast Cable Communications, LLC
    Inventors: Lawrence Wolcott, Justin Riggett, Bryan Johnston
  • Patent number: 9014555
    Abstract: A method for receiving optical signals and a device using the same method are provided herein. The method includes the elements of receiving an input signal which includes a signal component and an interference component, wherein the interference component is subcarrier to subcarrier intermixing interference (SSII). The input signal is first converted into a frequency domain signal. The interference component of the input signal is estimated based on a mathematical model according to at least a dynamic chirp component and a static chirp component. The interference component is then cancelled from the input signal to obtain an output signal.
    Type: Grant
    Filed: December 24, 2012
    Date of Patent: April 21, 2015
    Assignee: Industrial Technology Research Institute
    Inventors: Chia-Chien Wei, Hsing-Yu Chen, Dar-Zu Hsu, Jye-Hong Chen
  • Patent number: 9014556
    Abstract: The present invention discloses an optical power monitoring method and apparatus.
    Type: Grant
    Filed: October 11, 2013
    Date of Patent: April 21, 2015
    Assignee: Huawei Technologies Co., Ltd.
    Inventor: Ning Liu
  • Patent number: 9008510
    Abstract: Embodiments provide a methodology for designing a large-scale non-blocking OCS using a multi-stage folded CLOS switch architecture for use in datacenter networks and fiber-rich backbone network POPs. One aspect employs a folded CLOS architecture because of its ease of implementation, enabling the topology to scale arbitrarily with increasing number of stages. The fraction of ports allocated for internal switch wiring (overhead) also increases with the number of stages. Design decisions are made to carefully optimize the insertion loss per module, number of ports per module, number of stages and the total scale required. Other embodiments include folded CLOS switch architectures having at least two stages. In one example, power monitoring may be included only on the leaf switches.
    Type: Grant
    Filed: January 17, 2014
    Date of Patent: April 14, 2015
    Assignee: Google Inc.
    Inventors: Xiaoxue Zhao, Amin Vahdat, Hong Liu
  • Patent number: 9008500
    Abstract: The invention discloses a system, a method and an apparatus for optical network protection. The system includes: an output control apparatus for obtaining protection mode information configured by a system and controlling an input signal to be output from a set line corresponding to said protection mode information; and a detection control apparatus for detecting powers of signals transmitted on an active line and on a standby line, if it is determined that the active line is abnormal and the standby line is normal according to detection results, then controlling the input signal to be output from a protection line corresponding to the protection mode information; if it is determined that the active line is normal, or that the active line and the standby line are abnormal according to the detection result, then controlling the input signal to be output from a set line corresponding to the protection mode information.
    Type: Grant
    Filed: September 28, 2009
    Date of Patent: April 14, 2015
    Assignee: ZTE Corporation
    Inventor: Hongbing Zou
  • Patent number: 9008509
    Abstract: A system, a device, and a method include a network interface device that measures optical power of a passive optical device; generates optical power data, and stores the optical power data. The system, the device, and the method, also includes generating alarms based on the optical power data and communication with remote network interface devices via the passive optical device.
    Type: Grant
    Filed: August 29, 2011
    Date of Patent: April 14, 2015
    Assignee: Verizon Patent and Licensing Inc.
    Inventors: Michael B. Freiberger, Evan L. Klassen
  • Patent number: 9008514
    Abstract: Example embodiments of the present invention relate to An optical node comprising of at least two optical degrees; a plurality of directionless add/drop ports; and at least one wavelength equalizing array, wherein the at least one wavelength equalizing array is used to both select wavelengths for each degree, and to perform directionless steering for the add/drop ports.
    Type: Grant
    Filed: June 22, 2013
    Date of Patent: April 14, 2015
    Inventors: Mark E. Boduch, Kimon Papakos
  • Patent number: 9007228
    Abstract: An Ethernet-based transmission system using a dying gasp according to the present invention includes an SMPS for supplying power to an Ethernet-based lower level system, detecting a state of a power fault, and outputting a dying gasp alarm signal. A CPU receives the dying gasp alarm signal, and generates and transmits an alarm packet. A PHY chip receives the alarm packet, and uplinks the alarm packet so that the alarm packet is transferred to a higher level stage. An L3 switch receives the alarm packet and determines whether a power fault has occurred in the lower level system. Accordingly, the present invention applies a dying gasp to an Ethernet-based or EPON-based transmission system and is then capable of generating and transmitting an alarm packet so that when a power fault occurs, a device in a higher level network can rapidly determine the occurrence of the power fault.
    Type: Grant
    Filed: July 2, 2013
    Date of Patent: April 14, 2015
    Assignee: UBIQUOSS Inc.
    Inventors: Dong Il Song, Min-kyu Cho
  • Publication number: 20150098696
    Abstract: An optical transmission device including a wavelength selective switch including plural output ports, an optical intensity monitoring device that receives each optical signal output from the plural output ports of the wavelength selective switch and monitors the optical intensity of the optical signals, and a controller that controls optical intensity of the optical signals from the plural output ports of the wavelength selective switch based on the optical intensities monitored by the optical intensity monitoring device.
    Type: Application
    Filed: December 10, 2014
    Publication date: April 9, 2015
    Applicant: FUJITSU LIMITED
    Inventors: Hiroki OI, Kosuke KOMAKI
  • Patent number: 9002201
    Abstract: For testing an optical network, a transmission module transmits a first optical power level on a first optical port of an optical assembly. The optical assembly includes the first optical port, one or more of an optical cable and an optical waveguide, and a second optical port. The optical assembly is installed in an assembled computer in a state suitable for an end user. A measurement module measures a second optical power level on the second optical port, and a determination module determines a quality level by determining if the second optical power level is below a quality threshold value. The transmission module, the measurement module, and the determination module function within an assembled computer in a state suitable for an end user.
    Type: Grant
    Filed: January 3, 2013
    Date of Patent: April 7, 2015
    Assignee: International Business Machines Corporation
    Inventors: Alan F Benner, Richard B Finch, Jason Thomas Hirst, Peter Paul Lai, Gerald Glen Stanquist