Spare Channel Or Standby Optical Fiber Patents (Class 398/5)
  • Patent number: 10439848
    Abstract: Systems, methods, and processor readable media for distributing digital data and electrical power to a plurality of devices over high-impedance cables are disclosed. Certain embodiments include a gateway device connected to a power source, a first device connected to the gateway device by a cable, the cable being a high-impedance cable having at least two conductive paths, and wherein the first device receives electrical power and digital data from the gateway device via the cable over the same conductive path of the cable, a second device connected to the gateway device by the cable wherein the second device receives power and digital data from the gateway device via the cable over the same conductive path, and wherein the power source provides power to the first and second devices via the cable, and wherein the second device is connected to the gateway device through the first device via a daisy-chain topology.
    Type: Grant
    Filed: October 5, 2012
    Date of Patent: October 8, 2019
    Assignee: Audinate Pty Limited
    Inventors: Aidan Williams, Christopher Graham Ware
  • Patent number: 10411991
    Abstract: Aspects of the subject disclosure may include, for example, a network device that accesses internet protocol addresses associated with a group of end point devices where the network device is a closest network device to the group of end point devices, and transmitting data to another network device responsive to a determination that an internet protocol address associated with the data from an end point device is one of the internet protocol addresses associated with the group of end point devices. Other embodiments are disclosed.
    Type: Grant
    Filed: April 2, 2018
    Date of Patent: September 10, 2019
    Assignee: AT&T Intellectual Property I, L.P.
    Inventors: David Gross, Joshua Lackey, Donald E. Levy, Roger Piqueras Jover, Jayaraman Ramachandran, Cristina Serban
  • Patent number: 10361776
    Abstract: A transceiver can include a transmitter and a receiver. The transmitter can include: a primary laser emitter; a primary monitor photodiode optically coupled with the laser emitter; a spare laser emitter; and a transmitter integrated circuit having a primary channel operably coupled with the primary laser emitter; a spare channel operably coupled with the spare laser emitter; a switch on the primary channel; and a secondary channel operably coupled with the switch and the spare channel. The receiver can include: a primary detector photodiode; a spare detector photodiode; and a receiver integrated circuit a primary receiver channel operably coupled with the at least one primary detector photodiode; a spare receiver channel operably coupled with the spare detector photodiode; a receiver switch on the spare receiver channel; and a secondary receiver channel operably coupled with the receiver switch and the primary receiver channel.
    Type: Grant
    Filed: February 20, 2018
    Date of Patent: July 23, 2019
    Assignee: FINISAR CORPORATION
    Inventor: Frank J. Flens
  • Patent number: 10341028
    Abstract: A method for transmitting and receiving a radio frequency (RF) signal over an optical channel is described, where a nonlinear optical harmonic generation device is used to increase the system performance. The RF signal is phase modulated onto an optical carrier. The received optical carrier propagates through a nonlinear optical harmonic generation device, which increases a phase modulation depth at the harmonic wavelength. This larger modulation depth can be used to achieve larger gain. By photo-detecting both the fundamental and the harmonic optical wavelengths, then properly scaling and subtracting the two photo-detected signals, the enhanced modulation depth at the harmonic optical wavelength can be used to cancel out unwanted nonlinear distortions thereby linearizing the measured RF signal.
    Type: Grant
    Filed: January 29, 2018
    Date of Patent: July 2, 2019
    Assignee: Nucript LLC
    Inventor: Gregory S. Kanter
  • Patent number: 10313046
    Abstract: Verifying a configuration of reconfigurable internal optical paths (970) in a wavelength selective optical switching WSS node (62) involves identifying which of several WSS subsystems (920, 950, 960) is coupled upstream of a first internal optical path based on detecting optical power distinctive of the upstream subsystem and carried to the downstream WSS subsystem. The detecting can be of a power of wavelengths used for traffic (110), or a power of optical noise when there is no traffic (120). A record is made of the identified configuration. The automated verification can be carried out without the conventional dedicated optical wavelengths or dedicated optical hardware for inserting such additional wavelengths dedicated to discovery, and without disrupting the traffic if upgrading a node. It can be controlled locally or by an NMS such as an SDN controller.
    Type: Grant
    Filed: June 17, 2015
    Date of Patent: June 4, 2019
    Assignee: Telefonaktiebolaget LM Ericsson (Publ)
    Inventors: Roberto Magri, Matteo Constantini
  • Patent number: 10257739
    Abstract: A monitoring and troubleshooting system to determine whether or not an antenna that is used for receiving wireless weak signals, like base station for cellular wireless communication, is operational. The antenna status condition is signaled over the Fiber Optic (FO) link without interfering the signal during normal operation. When a fault is detected the status at the FO receiver is determined. Then, an indication using special signaling allows a service technician to distinguish if the status fault is antenna failure or antenna disconnect. The present invention will also allow a service technician to determine if there is a FO link failure by use of light intensity monitoring. The present invention also includes a method of monitoring the status of a radio frequency antenna with the apparatus as discussed above.
    Type: Grant
    Filed: January 15, 2018
    Date of Patent: April 9, 2019
    Assignee: Optical Zonu Corporation
    Inventors: Meir Bartur, James Stephenson, Farzad Ghadooshahy
  • Patent number: 10229020
    Abstract: A rework re-timer with forward error correction handling is disclosed. An example first intermediate transceiver includes a first interface to communicatively couple the first intermediate transceiver with a first computing device, a second interface to communicatively couple the first intermediate transceiver to a second intermediate transceiver configured to be communicatively coupled with a second computing device, an auto-negotiation controller to: terminate a first auto-negotiation with the first computing device before the first auto-negotiation is completed, transmit, to the second transceiver, first capabilities of the first computing device determined during the first auto-negotiation, and perform a second auto-negotiation with the first computing device utilizing the first capabilities of the first computing device and second capabilities of the second computing device received from the second transceiver.
    Type: Grant
    Filed: April 29, 2016
    Date of Patent: March 12, 2019
    Assignee: Hewlett Packard Enterprise Development LP
    Inventors: David M. Olson, John Wastlick, Jason Jung, Kevin B. Leigh
  • Patent number: 10177840
    Abstract: A communication apparatus configured to communicate with a router included in a first network and a multiplexer that multiplexes a plurality of optical signals having different wavelengths transmitted from the communication apparatus, the communication apparatus comprising a memory, and a processor coupled to the memory and configured to transmit and receive a first signal to and from the router, transmit and receive a second signal to and from another communication apparatus in a second network through the multiplexer, the second signal having a transmission scheme different from the first signal, mutually convert the first signal and the second signal with each other, detect a first communication disabled state between the another communication apparatus and the communication apparatus, and transmit, to the router, a first detection signal for detecting adjacency relationship between the communication apparatus and the router when the first communication disabled state is detected.
    Type: Grant
    Filed: April 30, 2018
    Date of Patent: January 8, 2019
    Assignee: FUJITSU LIMITED
    Inventor: Masatake Miyabe
  • Patent number: 10171168
    Abstract: Embodiments herein relate to optoelectronic transceivers with power management. An optoelectronic device may include a photodetector, a loss of signal (LOS) detector coupled with the photodetector, and a re-timer coupled with the LOS detector, wherein a component of the re-timer is to be disabled in response to a detection by the LOS detector that an optical signal has not been received for a predetermined time period. In some embodiments, the LOS detector is coupled with a driver disable input of the re-timer and a driver component of the re-timer is to be disabled. In some embodiments, a clock data recovery circuit, a transmit module re-timer and modulator, and/or a laser may be disabled. In various embodiments, components may be re-enabled in response to detection that an optical signal is being received and/or an electrical signal is received for optical transmission. Other embodiments may be described and/or claimed.
    Type: Grant
    Filed: March 25, 2016
    Date of Patent: January 1, 2019
    Assignee: Intel Corporation
    Inventors: Rohit Mittal, David S. Dunning
  • Patent number: 10141959
    Abstract: Radio-frequency (RF) integrated circuit (RFIC) chip(s) allow for the integration of multiple electronic circuits on a chip to provide distributed antenna system functionalities. RFIC chips are employed in central unit and remote unit components, reducing component cost and size, increasing performance and reliability, while reducing power consumption. The components are also easier to manufacture. The RFIC chip(s) can be employed in distributed antenna systems and components that support RF communications services and/or digital data services.
    Type: Grant
    Filed: April 12, 2018
    Date of Patent: November 27, 2018
    Assignee: Corning Optical Communications Wireless Ltd
    Inventors: Ofer Saban, Isaac Shapira
  • Patent number: 10122616
    Abstract: A method of local path protection in a node on a shared alternative path of a network. The method comprising receiving a signal switched on a primary label switched path (LSP). The signal is switched by lambda-switching or time-division multiplex TDM switching. The method further comprises receiving identification information arranged to identify the signal, and forwarding the signal on the alternative path based on the identification information.
    Type: Grant
    Filed: July 19, 2013
    Date of Patent: November 6, 2018
    Assignee: TELEFONAKTIEBOLAGET LM ERICSSON (PUBL)
    Inventors: Daniele Ceccarelli, Giulio Bottari, Diego Caviglia
  • Patent number: 10027407
    Abstract: A network design device includes a processor. The processor determines a second wavelength allocation based on a first wavelength allocation that indicates a wavelength allocation for a plurality of optical lines established in a wavelength division multiplexing optical network. The processor searches for a disconnection target optical line that is requested to be disconnected in order to realize a transition from the first wavelength allocation to the second wavelength allocation from among the plurality of optical lines. The processor generates procedure information that indicates a procedure of the transition from the first wavelength allocation to the second wavelength allocation based on a difference between the first wavelength allocation and the second wavelength allocation and a searched disconnection target optical line.
    Type: Grant
    Filed: June 7, 2017
    Date of Patent: July 17, 2018
    Assignee: FUJITSU LIMITED
    Inventors: Yutaka Takita, Kazuyuki Tajima, Tomohiro Hashiguchi
  • Patent number: 10014945
    Abstract: Embodiments relate to providing simultaneous digital and analog services in optical fiber-based distributed radio frequency (RF) antenna systems (DASs), and related components and methods. A multiplex switch unit associated with a head-end unit of a DAS can be configured to receive a plurality of analog and digital downlink signals from one or more sources, such as a service matrix unit, and to assign each downlink signal to be transmitted to one or more remote units of the DAS. In one example, when two or more downlink signals are assigned to be transmitted to the same remote unit, a wave division multiplexer/demultiplexer associated with the multiplex switch unit can be configured to wave division multiplex the component downlink signals into a combined downlink signal for remote side transmission and to demultiplex received combined uplink signals into their component uplink signals for head-end side transmission.
    Type: Grant
    Filed: February 20, 2017
    Date of Patent: July 3, 2018
    Assignee: Corning Optical Communications Wireless Ltd
    Inventors: William Patrick Cune, Ofer Saban, Isaac Shapira
  • Patent number: 9998211
    Abstract: The present invention provides a protection switching method for a passive optical network. The method includes receiving, by an optical network unit ONU through each of two uplink passive optical network PON interfaces, an optical network terminal management and control interface OMCI message delivered by an OLT, where the OMCI message includes: configuration information on a work side and configuration information on a protect side; and processing, by the ONU by using each of two independent OMCI MIBs of the ONU, the OMCI message received by each of the two uplink PON interfaces, updating each of the two independent OMCI MIBs according to the OMCI message, and independently responding to the OMCI message.
    Type: Grant
    Filed: April 9, 2015
    Date of Patent: June 12, 2018
    Assignee: HUAWEI TECHNOLOGIES CO., LTD.
    Inventors: Binchao Lin, Wei Wang
  • Patent number: 9991985
    Abstract: There is provided an optical transmission control device includes a memory, and a processor coupled to the memory and the processor configured to aggregate information of candidacy sections having a possibility that communication is discontinued among wavelength-multiplexed transmission sections, classify, based on the aggregated information, optical paths set between optical transmission devices into a first optical path on which, when communication in the candidacy sections is discontinued, an optical signal is not transmitted, and a second optical path on which, when the communication in the candidacy sections is discontinued, an optical signal is transmitted, and determine a wavelength allocation in a first wavelength group of the first optical path and a second wavelength group of the second optical path so that a difference in gain wavelength characteristics of the first optical path and the second optical path is equal to or less than a predetermined level.
    Type: Grant
    Filed: May 12, 2017
    Date of Patent: June 5, 2018
    Assignee: FUJITSU LIMITED
    Inventors: Tatsuya Tsuzuki, Tomoaki Takeyama
  • Patent number: 9980237
    Abstract: Individualized gain control of uplink paths in remote units in a wireless communication system based on individual remote unit contribution to combined uplink power is disclosed. The gain level is reduced for uplink paths of individual remote units that provide higher power contribution to the combined uplink power of a combined uplink communications signal received in the central unit. This allows the initial uplink gain of all remote units to be set higher to increase sensitivity, because the gain of the remote units that provide higher power contributions to the combined uplink power in the central unit can be reduced if the combined uplink power exceeds the desired threshold power level. The gain of the remote units that provide higher power contributions to the combined uplink power in the central unit can be reduced without reducing the gain in the other remote units that would otherwise reduce their sensitivity.
    Type: Grant
    Filed: June 9, 2017
    Date of Patent: May 22, 2018
    Assignee: Corning Optical Communications Wireless Ltd
    Inventor: Dror Harel
  • Patent number: 9967173
    Abstract: Aspects of the subject disclosure may include, for example, a network device that accesses internet protocol addresses associated with a group of end point devices where the network device is a closest network device to the group of end point devices, and transmitting data to another network device responsive to a determination that an internet protocol address associated with the data from an end point device is one of the internet protocol addresses associated with the group of end point devices. Other embodiments are disclosed.
    Type: Grant
    Filed: July 31, 2015
    Date of Patent: May 8, 2018
    Assignee: AT&T Intellectual Property I, L.P.
    Inventors: David Gross, Joshua Lackey, Donald E. Levy, Roger Piqueras Jover, Jayaraman Ramachandran, Cristina Serban
  • Patent number: 9960879
    Abstract: An optical line terminal (OLT) coupled to a plurality of optical network units (ONUs) through a passive optical network (PON). The OLT includes a transceiver configured to communicate via a management channel of a communication network with a plurality of OLTs. The communication includes sending or receiving a notification, wherein the notification includes the following: a source OLT identifier associated with a source OLT sending the notification, wherein the source OLT is configured to communicate over a first channel at a first wavelength of the PON; a destination OLT identifier associated with a destination OLT receiving the notification, wherein the destination OLT is configured to communicate over a second channel at a second wavelength of the PON; and an ONU identifier associated with a first ONU associated with the notification.
    Type: Grant
    Filed: January 3, 2017
    Date of Patent: May 1, 2018
    Assignee: FUTUREWEI TECHNOLOGIES, INC.
    Inventors: Yuanqiu Luo, Bo Gao, Frank Effenberger
  • Patent number: 9929802
    Abstract: According to an aspect of an embodiment, a method may include receiving a digital data signal at an optical receiver. The method may further include measuring an eye quality of the received digital data signal. In addition, the method may include adjusting a decision threshold of the optical receiver based on the measured eye quality.
    Type: Grant
    Filed: June 15, 2015
    Date of Patent: March 27, 2018
    Assignee: FINISAR CORPORATION
    Inventor: Ziv Lipkin
  • Patent number: 9917638
    Abstract: A monitoring and troubleshooting system to determine whether or not an antenna that is used for receiving wireless weak signals, like base station for cellular wireless communication, is operational. The antenna status condition is signaled over the Fiber Optic (FO) link without interfering the signal during normal operation. When a fault is detected the status at the FO receiver is determined. Then, an indication using special signaling allows a service technician to distinguish if the status fault is antenna failure or antenna disconnect. The present invention will also allow a service technician to determine if there is a FO link failure by use of light intensity monitoring.
    Type: Grant
    Filed: October 4, 2016
    Date of Patent: March 13, 2018
    Assignee: Optical Zonu Corporation
    Inventors: Meir Bartur, James Stephenson, Farzad Ghadooshahy
  • Patent number: 9917642
    Abstract: A method is provided for establishing a communication path in an optical network, the communication path comprising a plurality of sections, wherein the power level of a section is controlled by a respective power control unit of a network node. The method comprises the steps of, in response to a request to establish a communication path, step 201, controlling at least one power control unit to perform a first power-up mode of operation. The first power-up mode of operation comprises the step of setting a power control factor of a respective section of the communication path directly to a value estimated to provide a target power level, step 203.
    Type: Grant
    Filed: February 28, 2014
    Date of Patent: March 13, 2018
    Assignee: Telefonaktiebolaget LM Ericsson (publ)
    Inventors: Matteo Costantini, Antonio Melis, Lorenzo Siri
  • Patent number: 9871581
    Abstract: A monitoring apparatus and method for an optical signal-to-noise ratio and a receiver, where the apparatus includes: a processing unit configured to perform nonlinear processing on a pilot signal in received signals, or on a pilot signal in received signals and data signals in a predefined range neighboring the pilot signal; and a calculating unit configured to calculate an optical signal-to-noise ratio of the received signals according to a result of the nonlinear processing. Complexity of calculation may be lowered and accuracy of calculation of an optical signal-to-noise ratio may be improved, thereby efficiently improving the performance of the system.
    Type: Grant
    Filed: January 28, 2016
    Date of Patent: January 16, 2018
    Assignee: FUJITSU LIMITED
    Inventors: Liang Dou, Zhenning Tao
  • Patent number: 9819572
    Abstract: A protocol identifies and configures rings in a network topology automatically in order to simplify and quicken the actions that need to be performed in response to addition, deletion and shuffle of network nodes in that topology. Such rings do not need to be identified and configured manually. The protocol involves two separate sequentially performed phases. In the first phase, the protocol can automatically identify all rings that are present within a Virtual Local Area Network (VLAN) topology. In the second phase, the protocol can automatically configure each node of each such ring in conformity with the Ethernet Ring Protection (ERP) protocol. After this ERP configuration has been performed, the failure of a link within the network will not require every network node to re-learn paths through the network; instead, the nodes that are required to re-learn such paths can be limited to those within the particular ring that contained the failed link.
    Type: Grant
    Filed: August 21, 2015
    Date of Patent: November 14, 2017
    Assignee: Brocade Communications Systems, Inc.
    Inventor: Mritiyunjay Kumar Singh
  • Patent number: 9813160
    Abstract: Proposed is a method of equalizing an optical signal that has an overall bandwidth formed on a number of adjacent spectral slots, wherein the signal comprises a set of non-overlapping subcarrier signals. A distribution of the subcarrier signals onto the slots is such, that at least one slot is occupied by more than one subcarrier signal. The signal is received and amplified. Respective power levels are measured for the subcarrier signals. Distribution data is provided, which indicates the distribution of the subcarrier signals onto the spectral slots. Power level data is provided, which indicates for the spectral slots respective desired power levels. For the spectral slots respective attenuation values are derived, using the measured power levels, the distribution data and the power level data. Finally, the optical transmission signal is attenuated within the spectral slots individually, using the derived attenuation values.
    Type: Grant
    Filed: February 3, 2015
    Date of Patent: November 7, 2017
    Assignee: Alcatel Lucent
    Inventors: Annalisa Morea, Jeremie Renaudier, Amirhossein Ghazisaeidi
  • Patent number: 9769021
    Abstract: Techniques are described for providing managed virtual computer networks that have a configured logical network topology with virtual networking devices, such as by a network-accessible configurable network service, with corresponding networking functionality provided for communications between multiple computing nodes of the virtual computer network by emulating functionality that would be provided by the virtual networking devices if they were physically present.
    Type: Grant
    Filed: December 21, 2015
    Date of Patent: September 19, 2017
    Assignee: Amazon Technologies, Inc.
    Inventors: Kevin Christopher Miller, Eric Jason Brandwine, Andrew J. Doane
  • Patent number: 9762452
    Abstract: A network switch having one or more multi-endpoint (MEP) optical transceivers configured to provide an interface for optical data transport through the corresponding network. The use of MEP optical transceivers advantageously enables the network switch to be compatible with multiple network topologies. As a result, various embodiments of the disclosed network switch may be used to provide a builder and/or an operator of the corresponding network with a great deal of flexibility in choosing a network topology and/or degree of redundancy better suitable for the network's intended purpose and/or application without having to change some of the underlying hardware.
    Type: Grant
    Filed: October 1, 2015
    Date of Patent: September 12, 2017
    Assignee: Alcatel-Lucent USA Inc.
    Inventor: Joseph K. Kakande
  • Patent number: 9755969
    Abstract: Mechanisms are provided for tracing a route taken by a packet in a Software Defined Network (SDN). Each switch in the SDN is assigned a first color label, from a set of color labels, such that such that adjacent switches have different color labels. Rules are installed in each switch to forward a received data packet to the SDN controller in response to a second color label of the received data packet not matching the first color label assigned to the switch. A second color label, from the set of color labels, is assigned to a trace data packet. A route of the trace data packet is traced through the SDN based on the second color label and application of the one or more rules to the trace data packet at each of the switches in the SDN as the trace data packet is received by each of the switches in the SDN.
    Type: Grant
    Filed: March 4, 2014
    Date of Patent: September 5, 2017
    Assignee: International Business Machines Corporation
    Inventor: Kanak B. Agarwal
  • Patent number: 9705628
    Abstract: The present applies to digital wavelength converters that convert, independently of the format in which optical data may be encoded, an input waveform at a first wavelength to an output waveform at a second wavelength. When operating in an environment where an input waveform has a pilot tone associated thereto, the method and system of the present disclosure allows for the removal of the pilot tone from the input waveform, and also allows for the addition of another pilot to the output waveform.
    Type: Grant
    Filed: September 7, 2016
    Date of Patent: July 11, 2017
    Assignee: HUAWEI TECHNOLOGIES CO., LTD.
    Inventors: Zhiping Jiang, Zhuhong Zhang, Xuefeng Tang
  • Patent number: 9692585
    Abstract: Optimizing ripple reductions in equalizers shared between multiple interface ports in a distributed antenna system (DAS). In one aspect, a downlink equalizer is shared between a downlink simplex port and a duplex port in a radio interface module(s) (RIM(s)) in the DAS. In another aspect, to optimize ripple reduction in the downlink equalizer, the downlink equalizer is configured to go through a plurality of downlink equalizer states that each can generate a downlink equalizer frequency response affecting downlink ripple of the RIM(s). At each of the downlink equalizer states, a test signal is provided to the downlink equalizer and a corresponding downlink ripple of the RIM(s) is recorded. When all of the downlink equalizer states are evaluated based on the test signal, the downlink equalizer is configured to function based on the downlink equalizer state associated with the smallest downlink ripple of the RIM(s).
    Type: Grant
    Filed: May 18, 2016
    Date of Patent: June 27, 2017
    Assignee: Corning Optical Communications Wireless Ltd
    Inventor: Liav Moshe Daniel
  • Patent number: 9667371
    Abstract: A transmission apparatus includes: a first input-output unit; a second input-output unit; a third input-output unit located in a first direction that is a transmission direction from the first input output unit and the second input-output unit; and a switch coupled to the first input-output unit, the second input-output unit, and the third input-output unit, wherein the first input-output unit requests the third input-output unit via the switch to notify in a second direction opposite to the first direction of a defect upon detecting the defect, wherein the third input-output unit transmits defect information indicating the defect to one of the first input-output unit and the second input-output unit via the switch in response to a requesting from the first input-output unit.
    Type: Grant
    Filed: April 24, 2015
    Date of Patent: May 30, 2017
    Assignee: FUJITSU LIMITED
    Inventor: Hiroshi Nishida
  • Patent number: 9654851
    Abstract: An optical cross-connect apparatus optical nodes in an optical network, the optical nodes being mutually connected through internode connection optical fibers, the optical cross-connect apparatus having: optical cross-connect portions having internode connection input ports and internode connection output ports respectively connected to the internode connection optical fibers, and internal connection input and output ports, the optical cross-connect portions being connected such that an internal connection output port of a predetermined optical cross-connect portion is directly connected to an internal connection input port of another optical cross-connect portion and is indirectly connected via the another optical cross-connect portion to an internal connection output port of a further optical cross-connect portion, at least one optical cross-connect portion of the optical cross-connect portions including an internal connection input port and an internal connection output port for connecting to an optical cr
    Type: Grant
    Filed: June 30, 2014
    Date of Patent: May 16, 2017
    Assignee: JAPAN SCIENCE AND TECHNOLOGY AGENCY
    Inventors: Ken-ichi Sato, Hiroshi Hasegawa
  • Patent number: 9628172
    Abstract: A method, in a node operating in a network with a control plane, to optimize wavelength retuning on service redials, includes detecting a failure on a link associated with the node; and, for each affected connections on the link, sending a respective release message to an associated originating node via the control plane, the release message including a protect path and a wavelength, wherein the release message is utilized by the associated originating node to redial the affected connections with the protect path and the wavelength determined by the node, to minimize wavelength retuning on the affected connections.
    Type: Grant
    Filed: November 26, 2014
    Date of Patent: April 18, 2017
    Assignee: Ciena Corporation
    Inventors: Anurag Prakash, Mohit Chhillar, Gerard Leo Swinkels
  • Patent number: 9614638
    Abstract: Methods and systems for periodic optical filtering to identify tone modulated optical signals may enable relatively rapid scanning of an optical signal to identify individual optical channels. The optical signal having tone modulated optical channels may be scanned over a free spectral range of a periodic optical filter, such as a comb filter, to generate a filtered signal. Then, center optical frequencies for each of the optical channels in the filtered signal may be determined by demodulation and digital signal processing.
    Type: Grant
    Filed: July 2, 2015
    Date of Patent: April 4, 2017
    Assignee: Fujitsu Limited
    Inventors: Inwoong Kim, Olga Vassilieva, Paparao Palacharla, Motoyoshi Sekiya
  • Patent number: 9515766
    Abstract: The present invention provides a node apparatus, where two N×N wavelength selective switches are used to form a parallel-connected structure, and two ends of each power splitter are separately connected to input ends of the N×N wavelength selective switches, and two ends of each power combiner are separately connected to output ends of the N×N wavelength selective switches, thereby transferring route switching selection work originally performed between multiple 1×M wavelength selective switches to the inside of the N×N wavelength selective switch for implementation. Compared with an original structure using discrete components, the node apparatus is simplified, and when a traffic volume expands, the number of module slots on a line side does not need to be increased, thereby reducing usage costs eventually. The present invention is used for signal transmission in a node.
    Type: Grant
    Filed: October 13, 2015
    Date of Patent: December 6, 2016
    Assignee: Huawei Technologies Co., Ltd.
    Inventors: Han Zhao, Liangjia Zong, Ning Liu
  • Patent number: 9485552
    Abstract: Methods and systems for bias control in an optical switch fabric include monitoring optical power at outputs of a plurality of switch elements in an N×N switch fabric that has N inputs, N outputs, and M?2 stages. A bias control of a first of the plurality of switch elements is adjusted. It is determined whether the optical power at the outputs of the first switch element after bias control adjustment conform more closely to a predetermined criterion relative to the monitored optical power at the outputs of the first switch element prior to adjustment. The adjusting and determining steps are repeated for each of the remainder of the plurality of switch elements.
    Type: Grant
    Filed: January 28, 2016
    Date of Patent: November 1, 2016
    Assignee: INTERNATIONAL BUISNESS MACHINES CORPORATION
    Inventors: Nicolas Dupuis, Daniel M. Kuchta, Benjamin G. Lee, Alexander Rylyakov, Clint L. Schow
  • Patent number: 9473263
    Abstract: The present applies to digital wavelength converters that convert, independently of the format in which optical data may be encoded, an input waveform at a first wavelength to an output waveform at a second wavelength. When operating in an environment where an input waveform has a pilot tone associated thereto, the method and system of the present disclosure allows for the removal of the pilot tone from the input waveform, and also allows for the addition of another pilot to the output waveform.
    Type: Grant
    Filed: January 16, 2015
    Date of Patent: October 18, 2016
    Assignee: Huawei Technologies Co., Ltd.
    Inventors: Zhiping Jiang, Zhuhong Zhang, Xuefeng Tang
  • Patent number: 9420358
    Abstract: Method and arrangement for protecting optical network systems, the arrangement (20) is based on an optical electrical optical GPON repeater structure. The repeater structure contains two optical modules—a regular ONU transceiver module and a reset-less OLT transceiver module which are working back-to-back. For management purposes, an ONU MAC module comprised in the repeater structure is intercepting the electrical signals from the ONU transceiver. The arrangement comprising the two repeater structures can be used to relay data between two passive optical network (PON) systems thereby opening a way to implement dual homing via the PON domain. Moreover, the arrangement is configured to enabling switch-over of functionality from one PON to the other PON at a communication failure in the former PON.
    Type: Grant
    Filed: April 8, 2010
    Date of Patent: August 16, 2016
    Assignee: Telefonaktiebolaget L M Ericsson (publ)
    Inventors: Elmar Trojer, David Hood
  • Patent number: 9397755
    Abstract: An exemplary method and apparatus are provided for high efficiency wavelength division multiplexing (WDM) optical communication systems. An optical transmitter adapted to transmit an optical signal on an optical WDM transmission channel to a corresponding optical receiver is described. The optical transmitter comprises a symbol generation unit adapted to convert input data into a sequence of data symbols at a symbol rate B; with B being a real number greater zero; an amplitude modulation unit adapted to modulate an amplitude of every Nth data symbol in a sequence derived from the sequence of data symbols, thereby creating a modulated sequence of data symbols; wherein N is an integer; wherein N>2; and a digital-to-optical converter adapted to convert a sequence derived from the modulated sequence of data symbols into an optical signal to be transmitted to the optical receiver.
    Type: Grant
    Filed: March 21, 2013
    Date of Patent: July 19, 2016
    Assignee: Alcatel Lucent
    Inventors: Jeremie Renaudier, Gabriel Charlet
  • Patent number: 9391693
    Abstract: The invention relates to a distributed radio access network communicatively coupled to a core network, and a method for upholding a service in case of a failure in the distributed radio access network. The distributed radio access network comprises a main radio equipment controller communicatively coupled to at least one remote radio unit over a main optical path, a backup radio equipment controller communicatively coupled to the main radio equipment controller for synchronization, and a protection optical path for communicatively coupling the at least one remote radio unit to the backup radio equipment controller in case of a failure in communication between the main radio equipment controller and the at least one remote radio unit over the main optical path such that a service remains running when the failure occurs.
    Type: Grant
    Filed: August 24, 2011
    Date of Patent: July 12, 2016
    Assignee: Telefonaktiebolaget L M Ericsson (publ)
    Inventors: Einar In De Betou, Jacob Österling, Niklas Johansson
  • Patent number: 9350446
    Abstract: A method (10) of selecting an optical signal power for an optical signal carrying traffic encoded on the optical signal in a modulation format. The optical signal is for transmission across an optical path in an optical communications system. The method (10) comprises: a. providing a probe optical signal at a probe signal power (12). The probe optical signal carries test traffic encoded on the probe optical signal in said modulation format (14). b. transmitting the probe optical signal across the optical path (16); and c. receiving the probe optical signal at an end of the optical path (18) and measuring an indicator of the quality of the received probe optical signal (20). The method comprises implementing steps a. to c. for each of a plurality of different probe signal powers (22, 26).
    Type: Grant
    Filed: March 15, 2011
    Date of Patent: May 24, 2016
    Assignee: TELEFONAKTIEBOLAGET LM ERICSSON (PUBL)
    Inventor: Gianmarco Bruno
  • Patent number: 9325446
    Abstract: A method of configuring an optical path, comprising: selecting a path from a first to a second node in an optical communications network; identifying each wavelength that may be used continuously across the path and selecting a transmission wavelength for the optical path one of the identified wavelengths for which: a fixed wavelength direction-bound add/drop transponder add operable at said wavelength is available at each node; if that first requirement is not met, a fixed wavelength direction-bound add/drop transponder or a fixed wavelength directionless add/drop transponder operable at said wavelength is available at each node; and if that second requirement is not met, a tunable wavelength direction-bound add/drop transponder or a tunable wavelength directionless add/drop transponder operable at said wavelength is available at each node.
    Type: Grant
    Filed: March 21, 2011
    Date of Patent: April 26, 2016
    Assignee: Telefonaktiebolaget L M Ericsson (publ)
    Inventors: Nicola Sambo, Giulio Bottari, Piero Castoldi, Filippo Cugini, Paola Iovanna
  • Patent number: 9325413
    Abstract: Apparatus for enabling recovery from failures in up to M working paths of a set of N working paths that are allocated N frequency slots of L different slot widths, where M, N and L are positive integers, N?L>1, and N>M>1. The apparatus includes a processor and a control plane interface. The processor is operative to allocate protection frequency slots to M protection paths in different manners depending on whether M is greater than L, equal to L or less than L. The control plane interface is operatively associated with the processor and is operative to effect provisioning of the M protection paths for supporting recovery from the failures. Related network, apparatus and methods are also disclosed.
    Type: Grant
    Filed: June 8, 2015
    Date of Patent: April 26, 2016
    Inventor: Doron Handelman
  • Patent number: 9261538
    Abstract: An electrical circuit and method includes a transmitter in a first power domain with a first supply voltage referenced to a first voltage reference. The transmitter has an oscillator generating a first carrier signal, and an analog modulator receiving an input sensor signal and the first carrier signal and generating a modulated carrier signal. A receiver is in a second power domain with a second supply voltage referenced to a second voltage reference. The second voltage reference is different from the first voltage reference. The receiver includes a demodulator that receives and demodulates the modulated carrier signal and generates an output sensor signal. At least one coupler includes a pair of galvanically isolated elements with one galvanically isolated element in each of the first and second power domains. The modulated carrier signal couples from the first power domain to the second power domain through the at least one coupler.
    Type: Grant
    Filed: June 6, 2014
    Date of Patent: February 16, 2016
    Assignee: Solantro Semiconductor Corp.
    Inventors: Christain Cojocaru, Igor Miletic, Gerald Augustoni
  • Patent number: 9154220
    Abstract: A highly reliable optical switching device and optical switching method ensure restoration of the failure in the large-capacity high density wiring of the multicore fiber with the general number of cores (7 cores, 19 cores and the like). An optical transmission system which transmits a supervisory control signal concerning a transmission path switching to one or more cores of a single or multiple multicore fibers, an active signal to one or more cores, and a standby signal to one or more cores includes optical switching devices connected to respective ends of the optical transmission system. Upon detection of the transmission failure of the active signal based on the signal transmission condition and information from the supervisory control signal, it is switched to the standby signal. The supervisory control signal is transmitted to the center core of the multicore fiber.
    Type: Grant
    Filed: February 20, 2014
    Date of Patent: October 6, 2015
    Assignee: HITACHI, LTD.
    Inventors: Toshiki Sugawara, Hidehiro Toyoda, Kenichi Tanaka
  • Patent number: 9136903
    Abstract: There is provided a method for resizing a network connection in an optical transport network that supports protection switching and receives a flexible Optical channel Data Unit (ODUflex(GFP)) signal. In addition, at nodes located on a protection path for protection switching, only a Link Connection Resize (LCR) protocol, except for a Bandwidth Resize (BWR) protocol, of Hitless Adjustment of ODUflex(GFP) (HAO) procedure is executed. On the other hand, both the LCR protocol and the BWR protocol are executed at nodes located on a working path for protection switching.
    Type: Grant
    Filed: August 13, 2013
    Date of Patent: September 15, 2015
    Assignee: ELECTRONICS AND TELECOMMUNICATIONS RESEARCH INSTITUTE
    Inventor: Ji-Wook Youn
  • Patent number: 9136940
    Abstract: There is provided a method for resizing a network connection in an optical transport network that supports protection switching and receives a flexible Optical channel Data (ODUflex(GFP)) signal. In addition, Hitless Adjustment of ODUflex(GFP) (HAO) procedure includes Suppress Bandwidth Resize (SBR) information that prevents a Bandwidth Resize (BWR) protocol from being initiated. Based on the SBR information, only the LCR protocol is executed at nodes located on a protection path for protection switching, except for the BWR protocol. On the other hand, both the LCR protocol and the BWR protocol are executed at nodes located on a working path.
    Type: Grant
    Filed: August 13, 2013
    Date of Patent: September 15, 2015
    Assignee: ELECTRONICS AND TELECOMMUNICATIONS RESEARCH INSTITUTE
    Inventor: Ji-Wook Youn
  • Patent number: 9124383
    Abstract: A reconfigurable electrical add/drop multiplexing node, a network, and optoelectronic integrated circuit form a novel high capacity fiber-optic integrated transmission and switching system with a baseline target capacity in excess of 1 Tbps. The node, network, and circuit can leverage optoelectronic integration of transmission and switching components along with using the full “transparency” window of modern optical fibers from about 1270 nm to about 1670 nm for a large number of relatively low-rate wavelengths. The electrical switching fabric can be part of a Reconfigurable Electrical Add/Drop Multiplexer (READM) with similar functionality as a Reconfigurable Optical Add/Drop Multiplexer (ROADM) except in a highly integrated fashion with the transmission components. The electrical switching fabric can implement flow switching on a composite signal to provide comparable functionality to optical components in electrical circuitry such as in Complementary metal-oxide-semiconductors.
    Type: Grant
    Filed: December 11, 2012
    Date of Patent: September 1, 2015
    Assignee: Ciena Corporation
    Inventors: Michael Y. Frankel, John P. Mateosky, Michael H. Shahine, Joseph Berthold
  • Patent number: 9083542
    Abstract: The invention provides for a method for using a computer network (10) comprising a number of switches (18, 20) each having ports for receiving and sending streams, wherein the streams are sent from a router (14) via the ports of switches (18, 20), that have shown interest, to at least one receiver (24, 26), whereby in case of a link failure at least one of the at least one receiver (24, 26) sends back a message to the router.
    Type: Grant
    Filed: February 9, 2009
    Date of Patent: July 14, 2015
    Assignee: Robert Bosch GmbH
    Inventors: Marc Smaak, Stephan van Tienen
  • Patent number: 9053298
    Abstract: A data transmission system using an optical fiber includes an optical fiber, a first light-emitting device, a second light-emitting device, a first photo-detecting device and a second photo-detecting device. Each of the first light-emitting device and the second light-emitting device is optically coupled to the input facet of the optical fiber, respectively. Each of the first photo-detecting device and the second photo-detecting device is optically coupled to the output facet of the optical fiber, respectively. In particular, the first light-emitting device and the second light-emitting device are packaged into a first optical subassembly, and the first photo-detecting device and the second photo-detecting device are packaged into a second optical subassembly.
    Type: Grant
    Filed: January 19, 2012
    Date of Patent: June 9, 2015
    Assignee: AmTRAN TECHNOLOGY CO., LTD
    Inventor: Wen-Ping Yu
  • Patent number: 9054955
    Abstract: Apparatus for enabling recovery from failures in up to M working paths of a set of N working paths that are allocated N frequency slots of L different slot widths, where M, N and L are positive integers, N?L>1, and N>M>1. The apparatus includes a processor and a control plane interface. The processor is operative to allocate protection frequency slots to M protection paths in different manners depending on whether M is greater than L, equal to L or less than L. The control plane interface is operatively associated with the processor and is operative to effect provisioning of the M protection paths for supporting recovery from the failures. Related network, apparatus and methods are also disclosed.
    Type: Grant
    Filed: December 30, 2012
    Date of Patent: June 9, 2015
    Inventor: Doron Handelman