Using Supervisory Signal Patents (Class 398/30)
  • Patent number: 10324429
    Abstract: A system having a utility, a communications intermediary and demand response resources. The utility may be connected to the communications intermediary via a network. The demand response resources may be connected to the communications intermediary via another network. A single dispatch destined for the demand response resources may be sent to the communications intermediary. The dispatch may be disaggregated at the communications intermediary into a multitude of dispatches which may be dispersed to their respective destined demand response resources. The demand response resources may send telemetries to the communications intermediary that aggregates the telemetries into a single telemetry. The single telemetry may be sent to the utility.
    Type: Grant
    Filed: May 22, 2017
    Date of Patent: June 18, 2019
    Assignee: Honeywell International Inc.
    Inventor: Edward Koch
  • Patent number: 10110301
    Abstract: Embodiments of the present invention disclose a method. The method includes determining, by an OLT, that an ONU goes offline, and sending to the ONU corresponding to an ONU identifier, a detection message that carries the ONU identifier, where the ONU identifier is an ONU identifier that is occupied before the ONU goes offline and that is not reassigned, and the detection message is used to instruct the ONU corresponding to the ONU identifier to report an identification code. The method also includes receiving, a response message, where the response message carries the identification code of the ONU that sends the response message. The method also includes and determining that the ONU corresponding to the identification code carried in the response message is a rogue ONU.
    Type: Grant
    Filed: June 14, 2017
    Date of Patent: October 23, 2018
    Assignee: HUAWEI TECHNOLOGIES CO., LTD.
    Inventors: Bo Qu, Baicheng Du, Dawei Lv
  • Patent number: 9680698
    Abstract: Communication of a module to a datapath node is disclosed. A controller node receives connection information identifying a first datapath node in communication with a network. The controller node obtains Operations, Administration, and Management (OAM) information including an OAM action set that identifies one or more OAM actions the first datapath node is capable of implementing at the first datapath node. A first OAM tool module is determined that is operative to perform at least one of the one or more OAM actions identified in the OAM action set to implement a first OAM tool function. The first OAM tool module is communicated to the first datapath node.
    Type: Grant
    Filed: August 1, 2012
    Date of Patent: June 13, 2017
    Assignee: Telefonaktiebolaget L M Ericsson (publ)
    Inventors: Wolfgang John, Meirosu Catalin
  • Patent number: 9665078
    Abstract: A system having a utility, a communications intermediary and demand response resources. The utility may be connected to the communications intermediary via a network. The demand response resources may be connected to the communications intermediary via another network. A single dispatch destined for the demand response resources may be sent to the communications intermediary. The dispatch may be disaggregated at the communications intermediary into a multitude of dispatches which may be dispersed to their respective destined demand response resources. The demand response resources may send telemetries to the communications intermediary that aggregates the telemetries into a single telemetry. The single telemetry may be sent to the utility.
    Type: Grant
    Filed: March 25, 2014
    Date of Patent: May 30, 2017
    Assignee: Honeywell International Inc.
    Inventor: Edward Koch
  • Patent number: 9647757
    Abstract: Systems and methods for optical modulation index calibration in a CATV network.
    Type: Grant
    Filed: February 18, 2015
    Date of Patent: May 9, 2017
    Assignee: ARRIS Enterprises, Inc.
    Inventors: Marcel F. Schemmann, Venkatesh G. Mutalik
  • Patent number: 9628183
    Abstract: The present invention relates to a transceiver element for an optical unit of a photoelectric barrier to such a photoelectric barrier. In particular, a transceiver element comprises at least one optical sender, at least one optical receiver and a control element, wherein said control element comprises a driver unit for driving said at least one optical sender to emit radiation and at least one receiver unit for sensing and evaluating electrical signals generated by said optical receiver.
    Type: Grant
    Filed: May 28, 2014
    Date of Patent: April 18, 2017
    Assignee: Rockwell Automation Safety AG
    Inventors: Carl Meinherz, James Edward Dogul, George E. Rollins, Martin Hardegger, Christopher Walther, Danilo Dorizzi
  • Patent number: 9236953
    Abstract: A method, a system, and a network for coordination between a data control plane and photonic control in a network include operating the data control plane with photonic control messaging included therein, wherein the data control plane is configured to at least establish end-to-end paths between a plurality of network elements at Layer 1; transmitting a photonic control message in or by the data control plane responsive to a requirement for photonic layer information; processing, via the data control plane, the photonic layer information received from photonic control responsive to the photonic control message, wherein the photonic control is configured to adjust photonic hardware responsive to a change at a photonic layer; and performing an action by the data control plane considering the photonic layer information.
    Type: Grant
    Filed: April 8, 2014
    Date of Patent: January 12, 2016
    Assignee: Ciena Corporation
    Inventors: Mohit Chhillar, Anurag Prakash, Rajagopalan Kannan, Dominic Richens, Hari Srinivasan
  • Patent number: 9184847
    Abstract: An optical line terminal (OLT) configured to receive transmission requests from a plurality of both network elements (NE) and customer premises equipment (CPE), allocate a timeslot to each NE for transmission on an optical distribution network (ODN), and a timeslot to each CPE for transmission on an electrical distribution network (EDN), wherein each NE intermediates between the OLT and the CPEs. Included is a NE configured to transmit a timeslot to a CPE for transmission on an EDN allocated by an OLT, receive data frames from the CPE during the timeslot, and forward the data frames to the OLT without rescheduling. Also included is a method comprising sending a transmission request to an OLT, receiving a timeslot from the OLT for transmission on an EDN in response, transmitting data frames to a NE during the timeslot, wherein the NE forwards the data frames to the OLT without rescheduling.
    Type: Grant
    Filed: May 17, 2013
    Date of Patent: November 10, 2015
    Assignee: Futurewei Technologies, Inc.
    Inventors: Yuanqiu Luo, Frank J. Effenberger, Meng Sui
  • Patent number: 9020340
    Abstract: An optical packet switching system includes a plurality of network elements for transmitting and receiving optical packet signals. Each network element includes an optical signal-to-noise ratio (OSNR) acquiring unit for acquiring the OSNR of each optical packet signal, an average value calculating unit for calculating the average value of the OSNRs of optical packet signals received within a predetermined time duration for each of the plurality of source network elements, and a difference information transmitter for calculating the difference between the calculated average value of the OSNRs and a target value of the OSNRs and then transmitting the difference to a network element corresponding to the difference. A source network element that has received the difference information adjusts the characteristics of an optical packet signal to be transmitted in a manner such that the difference is reduced.
    Type: Grant
    Filed: July 5, 2012
    Date of Patent: April 28, 2015
    Assignee: Fujitsu Telecom Networks Limited
    Inventor: Reiko Sato
  • Patent number: 9020341
    Abstract: An optical transmission system includes at least a first optical link to transmit a first data signal as a part of a multi-lane signal and a second optical link to transmit a second data signal as another part of the multi-lane signal; on the transmission side, a reference clock is constantly applied to the first data signal of the first optical link, and a delay clock is applied to the second data signal responsive to a control signal on the second optical link; on the receiving side, the phase of a first clock signal detected from the first data signal received on the first optical link and the phase of a second clock signal detected from the second data signal received on the second optical link are compared, and the control signal is detected from the comparison result.
    Type: Grant
    Filed: January 4, 2013
    Date of Patent: April 28, 2015
    Assignee: Fujitsu Limited
    Inventor: Tsuyoshi Yamamoto
  • Patent number: 9008130
    Abstract: A remote enclosure houses multiple subsystems. A first subsystem is coupled to a central office over a high-speed communication channel such as an OC-3 channel. The first subsystem extracts a downstream message from a first embedded operations channel included in the high-speed communication channel. The first subsystem also, when the downstream message is targeted to a first unit included in the first subsystem, forwards the message to a unit that processes the message for the first unit. When the message is not targeted to any unit included in the first subsystem, the first subsystem forwards the downstream message to another subsystem housed within the remote enclosure via a second embedded operations channel included in a second communication channel. The second subsystem is subtended from the first subsystem and is connected thereto by the second communication channel.
    Type: Grant
    Filed: August 15, 2003
    Date of Patent: April 14, 2015
    Assignee: ADC DSL Systems, Inc.
    Inventors: Donald J. Glaser, Carl E. Gabrjelson, Jr., Ashraf Nisar
  • Patent number: 8989571
    Abstract: According to an aspect of an embodiment, a method of modulating supervisory data onto an optical signal includes increasing a first power level of a first polarization component of an optical signal based on supervisory data. The method further includes decreasing a second power level of a second polarization component of the optical signal based on the supervisory data. The decrease in the second power level is substantially the same as the increase in the first power level such that a total power of the optical signal is substantially constant.
    Type: Grant
    Filed: September 14, 2012
    Date of Patent: March 24, 2015
    Assignee: Fujitsu Limited
    Inventors: Inwoong Kim, Olga Vassilieva, Paparao Palacharla, Motoyoshi Sekiya
  • Patent number: 8989572
    Abstract: An optical node apparatus that establishes an optical path between a first optical node and a second optical node in an optical network include a frequency modulation unit that superimposes a supervisory signal on a main signal by frequency-modulating the main signal, and a frequency demodulation unit that frequency-demodulates the supervisory signal superimposed on the received main signal.
    Type: Grant
    Filed: December 27, 2012
    Date of Patent: March 24, 2015
    Assignee: Fujitsu Limited
    Inventors: Takahito Tanimura, Takeshi Hoshida, Hisao Nakashima
  • Patent number: 8958702
    Abstract: In accordance with the present disclosure, disadvantages and problems associated with polarization dependent effects of a polarization multiplexed optical signal may be reduced through polarization scrambling. In accordance with an embodiment of the present disclosure a method for detecting polarization scrambling of a polarization multiplexed optical signal comprises receiving a polarization multiplexed optical signal associated with an optical network. The polarization multiplexed optical signal including a scrambled polarization orientation, the polarization orientation scrambled according to a scrambling frequency. The method further comprising receiving a polarization signal indicating the polarization scrambling of the received optical signal. The method additionally comprises descrambling the optical signal according to the polarization scrambling as indicated by the polarization signal.
    Type: Grant
    Filed: March 17, 2011
    Date of Patent: February 17, 2015
    Assignee: Fujitsu Limited
    Inventor: Futoshi Izumi
  • Patent number: 8958692
    Abstract: An optical transmission system includes a first node and a second node, the first node includes a first optical amplifier which outputs a signal to the second node through a first transmission line and a first monitoring unit, the second node includes a monitor which monitors a signal from the first transmission line, a second optical amplifier which outputs a signal to the first node through a second transmission line and a second monitoring unit, upon detecting disconnection from the first transmission line, the second monitoring unit transmits a notification for making power of the first optical amplifier reduced, upon receipt of the notification, the first monitoring unit reduces power of the first optical amplifier, and transmits a completion notification to the second monitoring unit, and upon not receiving the completion notification even after expiration of an allowed time, the second monitoring unit reduces power of the second optical amplifier.
    Type: Grant
    Filed: March 2, 2012
    Date of Patent: February 17, 2015
    Assignee: NEC Corporation
    Inventor: Yutaka Yano
  • Publication number: 20150043907
    Abstract: A supervisory channel is provided on an optical path (31) between nodes of an optical communication network. The nodes are arranged to use a set of wavelengths allocated for carrying traffic channels. An optical signal (16) which carries a supervisory channel is generated at a supervisory channel transmitter (15) and added (12) to the optical path (31) downstream of an optical amplifier (11). The optical signal (16) has a wavelength which is one of the set of wavelengths allocated for carrying traffic. The method is performed at a time when the wavelength is not being used to carry traffic. An impairment parameter of the received optical signal is measured at a supervisory channel receiver (15). The receiver is a coherent receiver and the impairment parameter is chromatic dispersion or polarisation mode dispersion.
    Type: Application
    Filed: November 9, 2011
    Publication date: February 12, 2015
    Applicant: Telefonaktiebolaget L M Ericsson, (publ)
    Inventors: Fabio Cavaliere, Giulio Bottari
  • Patent number: 8938165
    Abstract: An optical transmission device according to the present invention comprises: a Raman amplification means; a main signal light sending means which sends first main signal light; a communication interruption detection light monitoring means which sends a first signal if it cannot detect communication interruption detection light; a main signal light monitoring means which sends a second signal if it cannot detect second main signal light; a light monitoring signal analysis means which sends a result of its analysis of a light monitoring signal as a third signal in a predetermined period of time; and a control means which makes the Raman amplification means suspend the generation of the excitation light, if it cannot receive the third signal even after the elapse of the predetermined period of time in the state it has received the first signal and has not received the second signal, and stops sending of the first main signal light from the main signal light sending means when receiving the second signal further.
    Type: Grant
    Filed: January 20, 2012
    Date of Patent: January 20, 2015
    Assignee: NEC Corporation
    Inventor: Noboru Iijima
  • Publication number: 20150010301
    Abstract: In one embodiment, techniques are provided to generate a Border Gateway Protocol-Link State (BGP-LS) advertisement message comprising information configured to indicate topological information associated with a Layer 0 (L0) network, where the topological information includes information for connectivity within the L0 network that is available to a Layer 3 (L3) network. The advertisement message is sent to a node in the L3 network. The message sent from the L0 network is received at the node in the L3 network. The topological information in the message is analyzed in order to determine connections available to the L3 network, yet within the L0 network. A connection request is sent from the node in the L3 network to the L0 network and connections between the nodes in L3 network are established using available connections in the L0 network.
    Type: Application
    Filed: August 8, 2013
    Publication date: January 8, 2015
    Applicant: Cisco Technolgy, Inc.
    Inventors: Stefano B. Previdi, Clarence Filsfils, David Ward
  • Publication number: 20140341567
    Abstract: Opto-electronic measuring arrangement which is largely independent of extraneous light, comprising emitted and compensation light sources, which emit light time-sequentially and in a phased manner, wherein the emitted light is phase-shifted respectively by 180°. An optical receiver receives the light emitted by the emitted light source and reflected by the object being measured together with the light from the compensation light source. The actuation signals for the emitted and compensation light sources are controlled such that the synchronous signal difference occurring in the receiver between the different phases is reduced to zero. The optical coupling between the compensation light source and the receiver diode occurs mainly via an optical system in a printed circuit board on which the compensation light source and the receiver are arranged. The printed circuit board itself, i.e. the FR4 component thereof, may constitute the optical conductor between the compensation light source and receiver diode.
    Type: Application
    Filed: August 1, 2014
    Publication date: November 20, 2014
    Inventor: Erhard Schweninger
  • Publication number: 20140341566
    Abstract: A method may include determining a total data demand distribution for a plurality of subscribers associated with a link between a gateway router (GWR) and an optical line terminal (OLT) in a network. The method also includes identifying a maximum link capacity of the link between the GWR and the OLT. The method further includes identifying a speed tier for which a speed test is to be executed, and determining a speed test throughput distribution based on the speed tier, the total data demand distribution and the maximum link capacity in an identified time interval.
    Type: Application
    Filed: May 16, 2013
    Publication date: November 20, 2014
    Applicant: Verizon Patent and Licensing Inc.
    Inventor: Donald E. Smith
  • Patent number: 8886036
    Abstract: Disclosed is an optical line terminal for monitoring and controlling upstream and downstream optical signals, and more particularly, to an optical line terminal for monitoring and controlling upstream and downstream optical signals, which adds different low frequency monitoring signals to upstream and downstream wavelength division multiplexing optical signals in a bidirectional wavelength division multiplexing (WDM) optical network and senses and detects low frequency components of upstream and downstream optical signals to unite, monitor, and control optical outputs and wavelengths of the upstream and downstream wavelength division multiplexing optical signals into a single system.
    Type: Grant
    Filed: March 21, 2013
    Date of Patent: November 11, 2014
    Assignee: Electronics and Telecommunications Research Institute
    Inventors: Jong Sool Jeong, Hyun Soo Kim, Mi-Ran Park, Byungseok Choi, O-Kyun Kwon
  • Patent number: 8879905
    Abstract: One embodiment provides a system for performance monitoring in a passive optic network (PON). The system includes an optical line terminal (OLT) and an optical network unit (ONU). The OLT includes an optical transceiver configured to transmit optical signals to and receive optical signals from the ONU, and a performance monitoring mechanism configured to monitor performance of the PON based on received optical signals.
    Type: Grant
    Filed: May 13, 2013
    Date of Patent: November 4, 2014
    Assignee: Broadcom Corporation
    Inventors: Weidong Rick Li, Jaroslaw Wojtowicz
  • Patent number: 8873946
    Abstract: A system and method is disclosed that allows for the monitoring, analyzing and reporting on performance, availability and quality of optical network paths. The correlation of PM parameter metrics to client connections, coupled with threshold-based alarm generation provides a proactive and predictive management, reporting and analyzing of the health and effectiveness of individual path connections to alert Operational Support (OS) staff and/or customers to signal degradation and impending Network Element (NE) failures. The system and method performs in real-time processing intervals required for alarm surveillance in a telecommunications network.
    Type: Grant
    Filed: September 7, 2012
    Date of Patent: October 28, 2014
    Assignee: AT&T Intellectual Property II, L.P
    Inventors: David Mayo, Meei-Ling Chen
  • Patent number: 8867912
    Abstract: Optical service channel (OSC) systems and methods over high loss links are described utilizing redundant telemetry channels. A first telemetry channel provides a low bandwidth communication channel used when Raman amplification is unavailable on a high loss link for supporting a subset of operations, administration, maintenance, and provisioning (OAM&P) communication. A second telemetry channel provides a high bandwidth communication channel for when Raman amplification is available to support full OAM&P communication. The first and second telemetry operate cooperatively ensuring nodal OAM&P communication over high loss links (e.g., 50 dB) regardless of operational status of Raman amplification.
    Type: Grant
    Filed: September 7, 2012
    Date of Patent: October 21, 2014
    Assignee: Ciena Corporation
    Inventors: Balakrishnan Sridhar, Jun Bao
  • Patent number: 8861952
    Abstract: A multi-channel optoelectronic device is configured to establish a redundant status link with a remote device. The optoelectronic device can transmit N transmit optical signals to the remote device over a plurality of transmit channels and receive N receive optical signals from the remote device over a plurality of receive channels. The optoelectronic device includes one or more spare transmit and receive channels. When used with a remote device having spare transmit and receive channels, each device can establish a status link with the other and use the status link to switch out transmit and/or receive channels to identify and permanently switch out the worst transmit and/or receive channels. Alternately, the device can interoperate with a non-status-link enabled remote device by determining that the remote device is not status-link enabled, transitioning to a low transmit power mode, and transmitting and receiving over a plurality of default transmit and receive channels.
    Type: Grant
    Filed: February 28, 2008
    Date of Patent: October 14, 2014
    Assignee: Finisar Corporation
    Inventors: Christopher R. Cole, Lewis B. Aronson, Darin James Douma
  • Patent number: 8855486
    Abstract: A remotely controlled fiber testing method has the steps of: building a fiber network system including a local fiber station and a remote fiber station; sending a modulated signal to the remote fiber station by the local fiber station; demodulating the modulated signal to obtain a control command by the remote fiber station; executing the control command to obtain a testing result by the remote fiber station; modulating the testing result and sending the testing result back to the local fiber station; and demodulating the testing result by the local fiber station. Only one technician appointed to the local fiber station is sufficient to do the testing action. Therefore, the personnel cost is effectively reduced.
    Type: Grant
    Filed: December 12, 2012
    Date of Patent: October 7, 2014
    Assignee: Polarlink Technologies, Ltd.
    Inventors: Shih-Tien Lin, Fu-Chun Hung, Yu-Shu Chen, Ching-Wen Hsiao, Chun-Hung Su
  • Patent number: 8837950
    Abstract: Embodiments of the present invention include systems and methods for accessing the digital diagnostic data and controller data of a remote transceiver module via the diagnostic port of a local transceiver. The invention involves modulating high-speed data and out-of-band data as a double modulated signal, wherein the out-of-band data includes the remote transceiver controller and digital diagnostic data, which is subsequently accessible by an external user device from the diagnostic port of the local transceiver.
    Type: Grant
    Filed: August 28, 2008
    Date of Patent: September 16, 2014
    Assignee: Finisar Corporation
    Inventor: Lucy G. Hosking
  • Patent number: 8831427
    Abstract: An adaptive signal processing method to achieve an increase in capacity of data transfer systems, in which control data is returned via a backward channel. The method provides signal processing using an electrical sub-carrier sub-division according to frequency, the electrical sub-carrier with the lowest carrier frequency being permanently used as the backward channel (RC) for transferring control information relating to the current transfer quality of each sub-carrier. An electrical modulation on N parallel sub-carriers takes place in the transmitter (Tx) and then an optical intensity modulation is carried out for a serial data transfer in the optical channel (IRWC). The discrete division of the information to be transferred to the sub-carriers in a real-time operation can take place by the implementation of specific bit-loading algorithms.
    Type: Grant
    Filed: April 26, 2006
    Date of Patent: September 9, 2014
    Assignee: Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V.
    Inventors: Jelena Grubor, Volker Jungnickel, Klaus-Dieter Langer, Clemens Von Helmolt
  • Patent number: 8824891
    Abstract: A method removes signal interference in a passive optical network. The passive optical network includes an optical line terminal, a splitting unit coupled with the optical line terminal, an optical network unit coupled with the splitting unit, and an identification signal uniquely associated with the optical network unit. The method includes the steps of sending a first signal, detecting the first signal, comparing the detected first signal with an identification signal and decoupling the optical network unit from the splitting unit if the comparing step results in a mismatch.
    Type: Grant
    Filed: December 17, 2010
    Date of Patent: September 2, 2014
    Assignee: Xieon Networks S.a.r.l
    Inventors: Lutz Rapp, Dario Setti
  • Publication number: 20140241711
    Abstract: A communications networking having reduced transmission latency and improved reliability is described. To reduce signal transmission latency, network management data is removed from a data stream to prioritize the transmission of payload data at higher transmission rates. Management data is returned to the data stream in such a way that it minimizes an impact to payload transmission rates. To improve communications network reliability, the network is configured to form a primary communication path and a redundant communication path. Upon failure of a transceiver at one node, the network engages redundant transceivers on a per-node basis thereby using a segment of the redundant communication path. The data stream is returned to the primary communication path upon circumvention of the failed transceiver.
    Type: Application
    Filed: March 13, 2013
    Publication date: August 28, 2014
    Applicant: AOPTIX TECHNOLOGIES, INC.
    Inventors: Eric Saint Georges, Joseph Shiran, Scott Alan Young
  • Patent number: 8811815
    Abstract: A method includes generating a test signal and modulating the test signal. The method may also include transmitting the test signal on an optical path, where the optical path may include a number of add-drop multiplexer devices and amplifiers. The method may also include receiving the test signal at a destination device and converting the received test signal into an electrical signal. The method may further include identifying a portion of the electrical signal that is associated with the modulated test signal.
    Type: Grant
    Filed: April 20, 2009
    Date of Patent: August 19, 2014
    Assignee: Verizon Patent and Licensing Inc.
    Inventors: Tiejun J. Xia, Glenn A. Wellbrock
  • Patent number: 8787757
    Abstract: An optical communication network includes a plurality of optical transmission devices, a communication path, an optical repeater, and a supervisory controller that includes a supervisory control information sender which is installed on at least one of one of the optical transmission devices and the optical repeater and controls a drive signal supplied to a semiconductor optical amplifier that amplifies and outputs input signal light onto the communication path on the basis of the supervisory control information, and a supervisory control information receiver that receives the light which has been output from a semiconductor optical amplifier and transmitted through the communication path, converts the received light to an electric signal and identifies the supervisory control information on the basis of an intensity-modulated component of the total power of the electric signal in at least the other of one of the optical transmission devices and the optical repeater.
    Type: Grant
    Filed: November 15, 2010
    Date of Patent: July 22, 2014
    Assignee: Fujitsu Limited
    Inventor: Yutaka Kai
  • Patent number: 8774624
    Abstract: An optical communication system, where in an optical transmission apparatus arranged on a transmission side of respective repeating sections, an OSC optical amplifier is provided on an OSC light optical path between from an OSC transmitter to a multiplexer, and the OSC optical amplifier is controlled so that the power of OSC light transmitted on the transmission path becomes a previously set target value. As a result the OSC light is amplified by a different amplifying device to that for the main signal lights at the time of transmission. Therefore even in the case where the span losses are large, OSC light can be reliably received by the optical transmission apparatus on the reception side.
    Type: Grant
    Filed: August 25, 2008
    Date of Patent: July 8, 2014
    Assignee: Fujitsu Limited
    Inventors: Miki Onaka, Yuichi Suzuki
  • Patent number: 8768165
    Abstract: The invention refers a method and an arrangement for in service Raman gain measurements and monitoring of a wavelength division multiplex system. By measuring the power level values of a transmitted WDM signal (WMS_TX) and an optical supervisory signal (OSS_TX) at the transmitter and the power level values of the received signals (WMS_RX; OSS_RX) the Raman gain can be calculated for the different channels.
    Type: Grant
    Filed: August 25, 2009
    Date of Patent: July 1, 2014
    Assignee: Xieon Networks S.a.r.l.
    Inventor: Benoit Clouet
  • Patent number: 8761598
    Abstract: A communication device may be operable to determine, in an optical module, a signal quality associated with each of one or more host transmitter filters in a host circuit. The signal quality may be communicated from the optical module to the host circuit via a management interface. The communication device may control, in the host circuit, configuration of each of the host transmitter filters based on the signal quality. The communication device may be operable to determine, in the host circuit, a signal quality associated with each of one or more module transmitter filters in the optical module. The signal quality associated with each of the module transmitter filters may be communicated from the host circuit to the optical module via the management interface. The communication device may control, in the optical module, configuration of each of the module transmitter filters based on the signal quality.
    Type: Grant
    Filed: March 31, 2011
    Date of Patent: June 24, 2014
    Assignee: Broadcom Corporation
    Inventors: Sudeep Bhoja, Ali Ghiasi
  • Patent number: 8761600
    Abstract: According to an aspect of an embodiment, a method of modulating supervisory data onto an optical signal includes receiving supervisory data and adjusting a characteristic of a carrier of the optical signal for at least one of a first polarization component of the optical signal and a second polarization component of the optical signal based on the received supervisory data. The characteristic may be adjusted such that there is a relative difference between the characteristic for the first polarization component and the second polarization component. The relative difference of the characteristic between the first polarization component and the second polarization component may indicate the supervisory data. Alternately, the characteristic may be adjusted such that there is a change in a polarization orientation of the carrier on a Poincaré sphere that indicates the supervisory data.
    Type: Grant
    Filed: September 14, 2012
    Date of Patent: June 24, 2014
    Assignee: Fujitsu Limited
    Inventors: Inwoong Kim, Olga Vassilieva, Paparao Palacharla, Motoyoshi Sekiya
  • Patent number: 8755685
    Abstract: A joint switching method for an aggregation node, an aggregation node, and an optical network protection system including an aggregation node are provided. By monitoring information transferred between an active optical line terminal (OLT) and a broadband network gateway (BNG), the aggregation node finds a fault in time according to the monitored information and when a fault occurs, the aggregation node starts a local protection solution, enables a corresponding backup port connected to a backup OLT corresponding to the active OLT, and disables an active port connected to the active OLT. Through the method, when the active OLT is switched to the backup OLT, the aggregation node performs joint switching, which ensures normal communication.
    Type: Grant
    Filed: February 3, 2012
    Date of Patent: June 17, 2014
    Assignee: Huawei Technologies Co., Ltd.
    Inventors: Ruobin Zheng, Chenghu Shen
  • Patent number: 8755689
    Abstract: A method for localizing an optical network termination in an optical access network including an optical line termination and a number of optical links.
    Type: Grant
    Filed: May 29, 2008
    Date of Patent: June 17, 2014
    Assignee: Telecom Italia S.p.A.
    Inventors: Maurizio Valvo, Roberto Mercinelli, Paolo Solina
  • Patent number: 8724507
    Abstract: A system and method for implementing an automatic discovery function in a DWDM network are provided, wherein the system includes: an optical supervisory channel (OSC) being a bi-directional physical channel, configured to transmit information through multiplexing/de-multiplexing a wavelength independent of a master optical channel with the master optical channel; a first ASON control unit, being located in a first node, configured to interact with a second ASON control unit in an adjacent second node through the OSC channel so as to obtain the information of the second ASON control unit; and the second ASON control unit, being located in the second node, configured to interact with the first ASON control unit in the adjacent first node through the OSC channel so as to obtain the information of the first ASON control unit. Thereby, using the method and system of the present invention, the automatic discovery function can be implemented through the OSC channel transmission mechanism.
    Type: Grant
    Filed: February 4, 2008
    Date of Patent: May 13, 2014
    Assignee: ZTE Corporation
    Inventors: Zhihong Kang, Zhenyu Wang
  • Patent number: 8718467
    Abstract: Terminals of upstream and downstream sides of an in-service line and a detour line are connected by optical couplers. An optical oscilloscope is connected to one optical coupler, and a chirped pulse light source is connected to the other optical coupler to thereby form dualized lines. The detour line includes an optical line length adjuster for compensating for the phase difference of optical transmission signals that occurs because of the optical line length difference with the in-service line. Pulse light in which an optical frequency is chirped is transmitted from the chirped pulse light source. The pulse light is branched by the second optical coupler, passes through the in-service line and the detour line, is multiplexed again by the first optical coupler, and is measured by the optical oscilloscope.
    Type: Grant
    Filed: November 24, 2009
    Date of Patent: May 6, 2014
    Assignee: Nippon Telegraph and Telephone Corporation
    Inventors: Takeshi Tsujimura, Kuniaki Tanaka, Koichi Yoshida, Kazunori Katayama, Yuji Azuma, Masatoshi Shimizu
  • Patent number: 8705958
    Abstract: An optical packet switching apparatus includes (i) an optical packet switch for switching the route of an inputted optical packet signal and outputting the inputted optical packet signal, (ii) an input-side packet density monitoring unit for detecting the packet density of optical packet signals inputted to the optical packet switch, (iii) a first input-side optical amplifier provided on an input side of the optical packet switch, (iv) a first input-side variable optical attenuator (VOA) provided posterior to the optical amplifier, (v) a storage for storing the gain characteristics in relation to the packet density at the first input-side optical amplifier, and (vi) an input-side VOA control unit for controlling the attenuation by the first input-side VOA in such a manner as to compensate for the gain fluctuations due to the variations in the packet density at the first input-side optical amplifier, based on the packet density and the gain characteristics.
    Type: Grant
    Filed: March 11, 2011
    Date of Patent: April 22, 2014
    Assignee: Fujitsu Telecom Networks Limited
    Inventors: Shota Mori, Reiko Sato
  • Patent number: 8687959
    Abstract: A system and method for discovering configuration errors in an optical network is disclosed. The neighbors of each node are discovered. An information model of the optical network is formed, which may be used to determine configuration errors. In one embodiment, each node exchanges node identification messages with neighboring nodes to discover its neighbors, publishes the node neighbor information to the optical network, and forms its own information model from the node neighbor information published by the nodes.
    Type: Grant
    Filed: May 26, 2009
    Date of Patent: April 1, 2014
    Assignee: Ciena Corporation
    Inventors: Srinivasa Sesha Soma Sekhar Muppidi, Gopinath Ramanan
  • Patent number: 8682159
    Abstract: An optical communication system supporting detection and communication networks. A communication network transmission path and the detection network transmission path are provided as separate paths established by separate fibers or fiber pairs of the same optical fiber cable. All of the elements coupled to the communication network transmission path and the detection network transmission path may be powered by the same power feed equipment through the same optical fiber cable power conductor.
    Type: Grant
    Filed: July 9, 2008
    Date of Patent: March 25, 2014
    Assignee: Tyco Electronics Subsea Communications LLC
    Inventors: Dmitriy I. Kovsh, Ekaterina A. Golovchenko
  • Publication number: 20140079390
    Abstract: According to an aspect of an embodiment, a method of modulating supervisory data onto an optical signal includes increasing a first power level of a first polarization component of an optical signal based on supervisory data. The method further includes decreasing a second power level of a second polarization component of the optical signal based on the supervisory data. The decrease in the second power level is substantially the same as the increase in the first power level such that a total power of the optical signal is substantially constant.
    Type: Application
    Filed: September 14, 2012
    Publication date: March 20, 2014
    Applicant: FUJITSU LIMITED
    Inventors: Inwoong KIM, Olga VASSILIEVA, Paparao PALACHARLA, Motoyoshi SEKIYA
  • Publication number: 20140079391
    Abstract: According to an aspect of an embodiment, a method of modulating supervisory data onto an optical signal includes receiving supervisory data and adjusting a characteristic of a carrier of the optical signal for at least one of a first polarization component of the optical signal and a second polarization component of the optical signal based on the received supervisory data. The characteristic may be adjusted such that there is a relative difference between the characteristic for the first polarization component and the second polarization component. The relative difference of the characteristic between the first polarization component and the second polarization component may indicate the supervisory data. Alternately, the characteristic may be adjusted such that there is a change in a polarization orientation of the carrier on a Poincaré sphere that indicates the supervisory data.
    Type: Application
    Filed: September 14, 2012
    Publication date: March 20, 2014
    Applicant: FUJITSU LIMITED
    Inventors: Inwoong KIM, Olga VASSILIEVA, Paparao PALACHARLA, Motoyoshi SEKIYA
  • Patent number: 8670664
    Abstract: A system and method for managing the selection of ghost channels in an optical communication system, including components configured to collect one or more first data values indicating the validity of an optical communication channel within a first degree of a node in the optical communication system, collect one or more second data values indicating the optical power level of the optical communication channel, transmit the first and second data values to a second degree of the node, receive the first and second data values at the first degree, and aggregate the first and second data values for the first degree and the second degree at the first degree.
    Type: Grant
    Filed: February 26, 2010
    Date of Patent: March 11, 2014
    Assignee: Fujitsu Limited
    Inventors: Denis Daniel Leclair, Sean D. L. McVeigh, Kevan P. Jones, Jean V. E. Ouellet, Douglas J. Greenwood, John B. Mills, Robert W. Keys
  • Publication number: 20140023362
    Abstract: An apparatus including a polarization controller is described. The polarizer controller is communicatively coupled via a feedback loop to an evaluation module located near an optical receiver. The evaluation module is configured to measure polarization dependent loss (PDL) of an optical signal received at the optical receiver. The polarization controller is configured to receive feedback control data regarding the PDL from the evaluation module. Additionally, the polarization controller is configured to modify a state of polarization of the optical signal at an optical transmitter, which is communicatively coupled to the optical receiver, based on the feedback control data.
    Type: Application
    Filed: July 18, 2012
    Publication date: January 23, 2014
    Applicant: FUJITSU LIMITED
    Inventors: Olga VASSILIEVA, Inwoong KIM, Motoyoshi SEKIYA
  • Patent number: 8625987
    Abstract: The invention relates to a method for monitoring a passive optical network having a tree-like structure with a main line and a plurality of branches. The method includes transmitting a wake-up signal from an optical line termination (OLT) arranged in the main line to a plurality of monitoring units arranged in the branches. The method also includes detecting the wake-up signal and listening to information requests from the OLT in the monitoring units during a listening time interval after the detection of the wake-up signal. The method further includes transmitting an information request to be received in the listening time interval from the OLT to the monitoring units. The method additionally includes receiving the information request in the monitoring units during the listening time interval, one of the monitoring units which is addressed by the information request transmitting a response message back to the OLT.
    Type: Grant
    Filed: March 10, 2009
    Date of Patent: January 7, 2014
    Assignee: Alcatel Lucent
    Inventors: Thomas Pfeiffer, Michael Straub, Harald Schmuck, Jörg Hehmann
  • Patent number: 8615167
    Abstract: A WDM optical transmission system includes a plurality of optical nodes optically coupled by a transmission line, a processor that is operative to calculate an amount of adjustment of a reception level capable of increasing an optical signal-to-noise ratio for each channel of the WDM light reaching the optical node positioned at a receiving end of the unit section based on information on amplification operation of the WDM light in at least one optical-amplification repeating node disposed on the optical transmission line in the unit section, and to adjust a power level corresponding to each channel of the WDM light transmitted on the transmission line from the optical node positioned at a transmission end of the unit section in accordance with a calculation result of the calculation.
    Type: Grant
    Filed: September 12, 2011
    Date of Patent: December 24, 2013
    Assignee: Fujitsu Limited
    Inventors: Yasushi Sugaya, Takehiro Fujita, Satoru Okano
  • Patent number: 8606115
    Abstract: An optical transmission apparatus is provided with an optical filter on a transmission line between a reception end of a transmission line and an OSC receiver. The optical filter has transmission characteristics such as to pass main signal light and optical supervisory channel light (OSC light), and to cut off noise light contained in at least one end portion band on a short wavelength side and a long wavelength side of an OSC transmission band used for reception of OSC light. By such a configuration, even in a case where the OSC light is Raman amplified and transmitted, the influence of noise light due to Raman amplification can be reduced, and OSC light can be received reliably, enabling high dependability to be realized.
    Type: Grant
    Filed: March 19, 2009
    Date of Patent: December 10, 2013
    Assignee: Fujitsu Limited
    Inventor: Miki Onaka