Including Subscribers Patents (Class 398/71)
  • Patent number: 10404373
    Abstract: Structures of a transmission apparatus and a reception apparatus using a mobile fronthaul that transmit and receive a frequency synchronization signal and a management control signal using at least one of in-band signaling and wavelength division multiplexing (WDM) in a single band or multiple bands of a mobile fronthaul using an intermediate frequency-over-fiber (IFoF) based analog transmission scheme.
    Type: Grant
    Filed: November 22, 2017
    Date of Patent: September 3, 2019
    Assignee: ELECTRONICS AND TELECOMMUNICATIONS RESEARCH INSTITUTE
    Inventor: Minkyu Sung
  • Patent number: 10305594
    Abstract: An optical fiber-based cable is formed to include pre-manufactured wireless access nodes included at spaced-apart locations along a length of the optical fiber cable. Each wireless access node is formed to include an antenna, a wireless radio transceiver, and an optical transceiver. The cable is formed to include an optical transmission fiber (or fibers) and an electrical power conductor. The optical fiber(s) couples to the optical transceiver within each wireless access node, and a power conductor from the cable terminates at the node and is used to energize both the wireless transceiver and the optical transceiver. The antenna is preferably formed as a sheathing member around at least a portion of components forming the node. Upon deployment, the wireless node portion of the cable is able to provide communication between the cable and wireless devices in its vicinity.
    Type: Grant
    Filed: January 16, 2018
    Date of Patent: May 28, 2019
    Assignee: OFS FITEL, LLC
    Inventors: Mark A Boxer, John E George
  • Patent number: 10097269
    Abstract: A Passive Optical Networks (PONs) structure and a remote node in such a structure constituting at least a part of a backhaul network for supporting a Radio Access Network, in which a number of radio base stations are connected to optical networks units (ONUs) of said PONs structure. The ONUs of said PONs structure are grouped between separate PONs of said PONs structure. The ONUs of a separate PON are interconnected passively through a remote node of the PON in order to separate inter base station traffic of X2 interfaces from uplink and downlink data traffic of S1 interface heading from/to a core network via an optical line terminal (OLT). The remote node comprises of power splitter for enabling interconnection between ONUs of different PONs of said PONs structure.
    Type: Grant
    Filed: September 8, 2014
    Date of Patent: October 9, 2018
    Assignee: Telefonaktiebolaget LM Ericsson (publ)
    Inventors: Mozhgan Mahloo, Jiajia Chen, Lena Wosinska
  • Patent number: 10063312
    Abstract: A low-level reset message having a reset level provides a mechanism for an optical line terminal (OLT) to remotely reset a dysfunctional optical network unit (ONU). The reset message includes a reset level field which allows the OLT to instruct the ONU to perform a reset of some or all of its hardware and software components.
    Type: Grant
    Filed: June 20, 2017
    Date of Patent: August 28, 2018
    Assignee: Futurewei Technologies, Inc.
    Inventors: Bo Gao, Yuanqiu Luo
  • Patent number: 10056972
    Abstract: A low-level reset message having a reset level provides a mechanism for an optical line terminal (OLT) to remotely reset a dysfunctional optical network unit (ONU). The reset message includes a reset level field which allows the OLT to instruct the ONU to perform a reset of some or all of its hardware and software components.
    Type: Grant
    Filed: June 21, 2017
    Date of Patent: August 21, 2018
    Assignee: Futurewei Technologies, Inc.
    Inventors: Bo Gao, Yuanqiu Luo
  • Patent number: 10050712
    Abstract: A method and a device for determining a location of an optical splitter are provided. With the method, optical network units in a PON network are classified into K clusters based on locations of the optical network units with a K-means clustering-based algorithm. Distances between multiple optical network units in the same cluster are small. If it is determined that the number of the optical network units in each of the clusters does not exceed a threshold, a central office is added into the K clusters to obtain K new clusters; and for each of the new clusters, a location of an optical splitter corresponding to the new cluster is determined, so as to ensure that a sum of distances between the location of the optical splitter and locations of all elements in the new cluster is minimized.
    Type: Grant
    Filed: November 2, 2015
    Date of Patent: August 14, 2018
    Assignee: SOOCHOW UNIVERSITY
    Inventors: Gangxiang Shen, Hao Chen, Yongcheng Li
  • Patent number: 9813184
    Abstract: The invention relates to a method for establishing a communication channel, preferably an embedded control channel, between a central network node and at least one network unit to be integrated in a communication network including the central network node and an arbitrary but limited number of network units. The central network node is adapted to create and output a wavelength-division multiplex (WDM) downstream signal including downstream channel signals to be transmitted to the network units and to receive a WDM upstream signal including upstream channel signals created by the network units.
    Type: Grant
    Filed: September 17, 2015
    Date of Patent: November 7, 2017
    Assignee: Adva Optical Networking SE
    Inventors: Mirko Lawin, Stephan Pachnicke
  • Patent number: 9788270
    Abstract: A method of operating an optical-wireless access system, wherein an ONU obtains information on dynamic scheduling control of the optical-wireless access system, information on discontinuous reception control of the optical-wireless access system, or both of them, and such information is used in the ONU or transferred to an OLT and used as parameters of scheduling in the PON and sleep control.
    Type: Grant
    Filed: December 17, 2013
    Date of Patent: October 10, 2017
    Assignee: NIPPON TELEGRAPH AND TELEPHONE CORPORATION
    Inventors: Noriko Ilyama, Jun-ichi Kani, Naotaka Shibata
  • Patent number: 9621295
    Abstract: Methods, systems, and apparatus for overlaying a passive optical network on a legacy optical access network are disclosed. In one aspect a system includes a legacy optical access network in a copper loop plant. The legacy optical access network provides access to customer premises. The system also includes a gigabit passive optical network (GPON) that is overlaid on the legacy optical access network. A fiber is shared by the GPON and the legacy optical access network. The GPON can provide a plurality of channels on the shared fiber at wavelengths that are separate and independent of wavelengths of the legacy optical access network.
    Type: Grant
    Filed: November 21, 2013
    Date of Patent: April 11, 2017
    Assignee: ADTRAN, Inc.
    Inventors: Leif Sandstrom, Darrell Brown, Kevin Gregory Givens
  • Patent number: 9445287
    Abstract: An electronic device, a method, and a computer-readable medium. The electronic device includes a circuitry configured to receive a radio communication signal for another device, configured to determine, based on the radio communication signal, one or more features that can reflect the difference between an uplink transmission mode and a downlink transmission mode, and configured to judge whether the radio communication signal is for the uplink transmission or the downlink transmission according to the one or more features.
    Type: Grant
    Filed: September 29, 2012
    Date of Patent: September 13, 2016
    Assignees: Sony Corporation, Tsinghua University
    Inventors: Yu Rao, Wei Chen, Zhigang Cao, Xin Guo, Ryo Sawai, Ryota Kimura
  • Patent number: 9391697
    Abstract: A network element is disclosed. In accordance with some embodiments of the present disclosure, a network element may comprise a network interface configured to communicatively couple to a network, and a controller communicatively coupled to the network interface. The controller may be configured to determine a delay-measurement interval, and to perform a plurality of delay measurements at a respective plurality of randomly determined times within the delay-measurement interval. Performing a delay measurement may comprise sending an outgoing signal, receiving an incoming signal, and determining a delay time based on the outgoing signal and the incoming signal.
    Type: Grant
    Filed: April 2, 2013
    Date of Patent: July 12, 2016
    Assignee: Fujitsu Limited
    Inventors: Catherine Yuan, Vikas Mittal, Serdar Kiykioglu
  • Patent number: 9356700
    Abstract: Embodiments enable a half-duplex Time Division Duplex (TDD) mode for Ethernet Passive Optical Network (EPON) or EPON over Coax (EPoC) networks. Specifically, embodiments provide systems and methods for enabling an Optical Line Terminal (OLT)/Coaxial Line Terminal (CLT) to share a physical medium spectrum in time with the Optical Network Units (ONUs)/Coaxial Network Units (CNUs) that it services. In an embodiment, the OLT/CLT includes an EPON scheduler that can schedule downstream and upstream transmissions over the same physical medium spectrum. In another embodiment, the OLT/CLT is equipped with a burst mode transmit physical layer (PHY) module, which can be controlled by an EPON Medium Access Control (MAC) module, to transmit in burst mode over the physical medium. In a further embodiment, there is provided an ONU/CNU with a burst mode receive PHY module. The burst mode receive PHY module can maintain clock timing even with non-continuous reception from the OLT/CLT.
    Type: Grant
    Filed: May 31, 2013
    Date of Patent: May 31, 2016
    Assignee: Broadcom Corporation
    Inventor: Edward Boyd
  • Patent number: 9287981
    Abstract: An OLT, which is a station-side apparatus in a PON system, is connected to an ONU via an optical fiber. The OLT includes: an optical receiver which receives a burst signal from an ONU; a burst header detection unit which detects a certain delimiter pattern included in a received burst signal so as to establish synchronization of the burst signal; and a control unit which allows the burst header detection unit to perform detection of a delimiter pattern during a predicted reception period of a burst signal.
    Type: Grant
    Filed: February 6, 2013
    Date of Patent: March 15, 2016
    Assignee: FUJITSU LIMITED
    Inventors: Motoyuki Takizawa, Tetsuya Yokomoto, Koichi Seki, Takashi Ohira
  • Patent number: 9106335
    Abstract: Provided are an automatic wavelength recognition apparatus and method. The automatic wavelength recognition apparatus includes: a division unit receiving a single optical signal and dividing the received optical signal into a plurality of optical signals; a plurality of filter units filtering the optical signals and having different and wavelength-dependent pass characteristics; a plurality of detection units detecting the filtered optical signals and measuring intensities of the detected optical signals; at least one comparison unit comparing outputs of any two of the detection units; and a wavelength determination unit receiving an output of the at least one comparison unit and determining a wavelength of the above single optical signal using a pre-stored look-up table.
    Type: Grant
    Filed: June 29, 2012
    Date of Patent: August 11, 2015
    Assignee: Electronics and Telecommunications Research Institute
    Inventors: Sil-Gu Mun, Eun-Gu Lee, Dong-Min Seol, Eui-Suk Jung, Sang-Soo Lee, Jeong-Sik Cho
  • Patent number: 9100139
    Abstract: An optical system may include: a demultiplexer to receive an optical signal and to demultiplex the optical signal into a plurality of optical channels; a detector circuit to: receive the plurality of optical channels, and identify a predetermined channel identification trace tone frequency for an optical channel of the plurality of optical channels; and a receiver to: receive the optical channel with the identified predetermined channel identification trace tone frequency from the detector circuit, and process the optical channel.
    Type: Grant
    Filed: April 30, 2012
    Date of Patent: August 4, 2015
    Assignee: Juniper Networks, Inc.
    Inventors: Theodore J. Schmidt, Roberto Marcoccia
  • Patent number: 9094149
    Abstract: An arrangement is provided for transporting information from a central information distribution center (CIDC) to locations where such information is intended. Upon receiving a request for narrowcast information to be delivered to a node associated with a head end, the CIDC selects the requested information, generates an optical signal encoded with the requested information using information channels dedicated to narrowcast information transport for the node, and sends the optical signal to the head end via an optical fiber. When the head end receives the optical signal, the narrowcast information transport channels dedicated to the node are translated into subcarriers acceptable to the node before the requested narrowcast information is forwarded to the node.
    Type: Grant
    Filed: October 4, 2011
    Date of Patent: July 28, 2015
    Assignee: ARRIS Enterprises, Inc.
    Inventors: Irl N. Duling, Sandeep T. Vohra, Paul J. Matthews
  • Patent number: 9042728
    Abstract: An optical line termination node has a first connection arrangement for connecting a working fiber, a second connection arrangement for connecting a protection fiber, a transceiver arrangement having first primary link and a first secondary link, and protection switching means configured for being switched either in a working operating state or in a protection operating state.
    Type: Grant
    Filed: February 21, 2012
    Date of Patent: May 26, 2015
    Assignee: ADVA OPTICAL NETWORKING SE
    Inventor: Klaus Grobe
  • Patent number: 9031410
    Abstract: An optical network unit according to the present invention is provided as comprising a configuration that component units built therein are grouped for at least two sheets of substrate modules and arranged thereat. There are provided individual embodiments: (a) arranging an L2 layer and a part of the component unit of an L1 layer at a first substrate module, meanwhile, arranging the left part of the component unit of the L1 layer at a second substrate module; (b) arranging the component units of the L1 layer and of the L2 layer at the first substrate module and the second substrate module individually by grouping therefor; and (c) arranging the component units of the L2 layer and of the L1 layer at the first substrate module and the second substrate module respectively.
    Type: Grant
    Filed: March 6, 2013
    Date of Patent: May 12, 2015
    Assignee: Furukawa Electric Co., Ltd.
    Inventors: Kazutaka Shimoosako, Kunio Odaka, Katsuya Aboshi
  • Patent number: 9025956
    Abstract: A system for routing signals in a Distributed Antenna System includes a plurality of local Digital Access Units (DAUs) located at a Local location. Each of the plurality of local DAUs is coupled to each other and operable to route signals between the plurality of local DAUs. Each of the plurality of local DAUs includes one or more Base Transceiver Station (BTS) RF connections. Each of the plurality of BTS RF connections is operable to be coupled to one of one or more sectors of a BTS. The system also includes a plurality of remote DAUs located at a Remote location. The plurality of remote DAUs are coupled to each other and operable to transport signals between the plurality of remote DAUs.
    Type: Grant
    Filed: January 30, 2013
    Date of Patent: May 5, 2015
    Assignee: Dali Systems Co. Ltd.
    Inventors: Shawn Patrick Stapleton, Sasa Trajkovic
  • Patent number: 9020349
    Abstract: An arrangement at a Remote Node, a Remote Node, a Central Office, a WDM-PON and a method in an arrangement at a Remote Node, and a method in a Central Office are provided for supervision of the WDM-PON. The arrangement comprises at least one filter connected to the feeder fiber links and adapted to separate a data signal and an original OTDR signal received on either of the feeder fiber links. Further, the arrangement comprises a first splitter adapted to receive, from the at least one filter, the original OTDR signal, to split the original OTDR signal into a plurality of OTDR sub-signals and to output, to an N*M AWG, the plurality of OTDR sub-signals. The at least one filter is further adapted to output the original OTDR signal to the first splitter and to output the data signal to the AWG, thereby enabling supervision of the WDM-PON.
    Type: Grant
    Filed: March 28, 2012
    Date of Patent: April 28, 2015
    Assignee: Telefonaktiebolaget L M Ericsson (publ)
    Inventors: Jiajia Chen, Patryk Urban
  • Patent number: 9014561
    Abstract: A method and system for upgrading service to an optical network terminal among a plurality of optical network terminals on a passive optical network. The upgrade enables bidirectional communications between a central office and the optical network terminal over dedicated downstream and upstream wavelength channels outside the downstream and upstream wavelength bands associated with the passive optical network. The optical network terminal to receive upgraded service is disconnected from a passive optical splitter at a remote node serving the optical network terminal, and optically coupled to a port of the multi-port arrayed waveguide grating at the remote node. Wavelength taps are provided at the central office and the remote node to facilitate multiplexing and demultiplexing the dedicated downstream and upstream channels with the downstream and upstream wavelength bands associated with the passive optical network.
    Type: Grant
    Filed: February 1, 2007
    Date of Patent: April 21, 2015
    Assignee: AT&T Intellectual Property II, L.P.
    Inventors: Patrick P. Iannone, Mark D. Feuer, Kenneth C. Reichmann, Kent G. McCammon
  • Patent number: 9008513
    Abstract: The present invention proposes a wavelength division multiplexing-passive optical network (WDM-PON) system which transmits downstream data to an optical network unit (ONU) as an optical line termination (OLT) receives seed light from a spectrum-sliced external light source module. One characteristic of the proposed WDM-PON system is that optical transmitters of the OLT and ONU are operated regardless of optical wavelength. Another characteristic of the proposed WDM-PON system is that a conventional TDMA-PON (E-PON or G-PON) ONU can be accommodated without a change.
    Type: Grant
    Filed: October 16, 2008
    Date of Patent: April 14, 2015
    Assignee: Electronics and Telecommunications Research Institute
    Inventors: Byoung Whi Kim, Han Hyub Lee, Jie Hyun Lee, Bong Tae Kim
  • Patent number: 8995837
    Abstract: An ONU includes a CDR that regenerates a clock based on a signal from an OLT, an oscillator that generates an internal clock, a time stamp counter that manages a time of the ONU based on the clock in a period in which the CDR regenerates the clock and manages the time of the ONU based on the internal clock in a period in which the CDR does not regenerate the clock, an MPCP control unit that decides, when a Cyclic Sleep mode is set, a receiver-time synchronization time that is a period in which the receiver is normally operated within a sleep time, based on a difference between a time stamp value included in the signal transmitted from the OLT and a time stamp managed by the time stamp counter, and a power-saving control unit that controls the receiver to be normally operated in the receiver-time synchronization time.
    Type: Grant
    Filed: June 29, 2011
    Date of Patent: March 31, 2015
    Assignee: Mitsubishi Electric Corporation
    Inventors: Jun Mizuguchi, Fumihiko Tano
  • Patent number: 8995830
    Abstract: An ONU includes a power-interruption detecting unit configured to detect power interruption of the ONU, a transmitting and receiving unit capable of being set in a power saving state, and a PON-side control unit configured to notify an OLT of, as power saving return information, a power holding time during occurrence of the power interruption of the ONU and a startup time, which is time until the transmitting and receiving unit returns from the power saving state, and, when the power-interruption detecting unit detects the power interruption, transmit a power interruption notification to the OLT. The OLT includes the PON control unit configured to determine, based on the power saving return information, whether the ONU can transmit the power interruption notification when the power interruption occurs in the power saving state.
    Type: Grant
    Filed: February 25, 2011
    Date of Patent: March 31, 2015
    Assignee: Mitsubishi Electric Corporation
    Inventors: Takashi Kikuzawa, Hiroaki Mukai
  • Patent number: 8989580
    Abstract: The disclosure provides a long-distance box and a method for processing uplink light and downlink light of the long-distance box, uplink light and downlink light from different Passive Optical Network (PON) systems are split, the uplink light from the different PON systems is transmitted through a first optical path, and the downlink light from the different PON systems is transmitted through a second optical path; wherein the uplink light from the different PON systems is amplified by an Optical Amplifier (OA) and then output to Optical Line Terminals (OLT) of respective systems; the downlink light from different PON systems with the different wavelengths is transmitted through different optical sub-paths of the second optical path according to the wavelengths of the downlink light, and the downlink light is amplified by different Optical-Electrical-Optical (OEO) conversion devices on the different optical sub-paths and then output to Optical Network Units (ONUs) of the respective systems.
    Type: Grant
    Filed: December 2, 2010
    Date of Patent: March 24, 2015
    Assignee: ZTE Corporation
    Inventors: Jidong Xu, Dezhi Zhang
  • Patent number: 8983295
    Abstract: The inventive concept relates to an optical line terminal registering optical network terminals having overlapping serial numbers. The optical line terminal may include a memory storing serial number information of optical network terminals of which a registration is completed in a storage region; and a control part that if a serial number by a serial number request is received from optical network terminals, the received serial number is compared with the serial number information of the memory and if they overlap each other, a previously set preliminary identifier is allocated to the optical network terminal having an overlapping serial number.
    Type: Grant
    Filed: April 30, 2013
    Date of Patent: March 17, 2015
    Assignee: Electronics and Telecommunications Research Institute
    Inventors: Hark Yoo, Geun Yong Kim, Youngsuk Lee, Sung Chang Kim, Dongsoo Lee
  • Patent number: 8977120
    Abstract: In an apparatus for accommodating and multiplexing asynchronous client signals in which an idle signal is defined, the transmission side transmits client signals after synchronizing the client signals by inserting or removing, with reference to a specific client signal, an idle signal to/from the same type of another client signal, and in the receiving side, a PLL part is shared by recovering a clock from a client signal and distributing the clock for another client signal.
    Type: Grant
    Filed: March 11, 2011
    Date of Patent: March 10, 2015
    Assignees: Nippon Telegraph and Telephone Corporation, Fujitsu Limited
    Inventors: Takuya Ohara, Takashi Ono, Shigeki Aisawa, Masahito Tomizawa, Hiroyuki Honma, Satoru Saitoh, Masahiro Shioda
  • Patent number: 8958694
    Abstract: One or more overlay wavelengths are applied to a GPON architecture to provide sufficient, cost-effective forward bandwidth per home for targeted, unique narrowcast services to allow traditional HFC operators to use a PON architecture with their existing HFC equipment. A separate return path capability using a separate coaxial cable with RF signals to the GPON may also be used. This return capability may be provided either by a fiber optic link or coaxial link from the home.
    Type: Grant
    Filed: March 5, 2013
    Date of Patent: February 17, 2015
    Assignee: General Instrument Corporation
    Inventors: Philip Miguelez, Shawn M. Esser, Fred Slowik
  • Patent number: 8953941
    Abstract: Typical passive optical networks (PONs) employ several optical network terminals (ONTs) connected to an optical line terminal (OLT) via an optical splitter/combiner (OSC). Due to the passive nature of the OSC, determining a port assignment of an ONT may be difficult or impossible. Methods described herein provide for identifying a port in a passive optical network, optionally as corresponding to an ONT. A first subset of the ONTs is caused to transmit a first signal, such as a status signal, with a respective attribute having a first value, and a second subset of the ONTs is caused to transmit a second signal with the respective attribute having a second value. At the OSC, the signals are detected as a function of the attribute and the first and second values. Results of this detection are reported, from which an identification of a port and associated ONT can be determined.
    Type: Grant
    Filed: March 14, 2013
    Date of Patent: February 10, 2015
    Assignee: Tellabs Bedford, Inc.
    Inventors: Craig L. Lutgen, Mahlon D. Kimbrough
  • Patent number: 8948598
    Abstract: A method for communicating in a passive optical network (PON), includes receiving traffic from a plurality of optical network units (ONUs) transmitting in an upstream transmission channel, wherein each of the ONUs may transmit at any wavelength within a wavelength band associated with the upstream transmission channel. The method also includes dividing the upstream transmission channel into a plurality of sub-channels, that each include a subset of the wavelength band associated with the upstream transmission channel. The method further includes determining the identity of each of the plurality of ONUs transmitting in each of the sub-channels, assigning a plurality of ONUs transmitting in the upstream transmission channel to each of at least two of the sub-channels based on the determination of the ONUs transmitting in that sub-channel, and allocating transmission timeslots for time-shared transmission by the ONUs in one or more of the sub-channels.
    Type: Grant
    Filed: September 18, 2008
    Date of Patent: February 3, 2015
    Assignee: Fujitsu Limited
    Inventor: Martin Bouda
  • Patent number: 8942560
    Abstract: The present disclosure is directed to a method and apparatus for maintaining sub-queues at an ONU and for maintaining a count of an amount of data stored in each sub-queue or a count of an amount of data associated with elements stored in each sub-queue. The sub-queues represent partitions in a first in, first out (FIFO) queue used by the ONU to buffer packets, or elements that are associated with packets, to be sent upstream. The sub-queues are coupled in series such that the output of a first sub-queue feeds the input of a second sub-queue, the output of the second sub-queue feeds the input of a third sub-queue, etc. Each sub-queue has a defined threshold that sets a maximum amount of packet data it can buffer or the elements in which it buffers can be associated with.
    Type: Grant
    Filed: March 12, 2012
    Date of Patent: January 27, 2015
    Assignee: Broadcom Corporation
    Inventors: Ryan Edgar Hirth, Glen Kramer, Mitchell Gordon McGee
  • Publication number: 20150023665
    Abstract: Methods and systems for distributing multicast signals carried by an incoming light wave are disclosed. According to one aspect, the invention provides a method of controlling an optical device. The method includes dynamically controlling a plurality of optical attenuators of the optical device based on control signals indicative of changes to a multicast group.
    Type: Application
    Filed: July 19, 2013
    Publication date: January 22, 2015
    Inventors: Suresh KRISHNAN, Robert BRUNNER, Stephane LESSARD
  • Patent number: 8938168
    Abstract: There is provided an office-side line concentration device that accommodates a plurality of passive optical networks, including a plurality of receiving means connected to each of the plurality of passive optical networks, and interface means for controlling a transmission timing of user data from the plurality of passive optical networks so that user data received by the plurality of receiving means can be arranged closely in an uplink, thus enabling effective use of bandwidth in the uplink.
    Type: Grant
    Filed: October 1, 2013
    Date of Patent: January 20, 2015
    Assignee: Sumitomo Electric Industries, Ltd.
    Inventor: Kazuhisa Yamashita
  • Patent number: 8917990
    Abstract: The present invention relates to a method and devices for fast protection of an optical network system, in particular for a Passive Optical Network (PON), such as a Gigabit-capable Passive Optical Network (GPON). In the method, it is detected that the communication from a first optical network device is lost. Switching of functionality is initiated from a first optical line termination device to a second optical line termination device, and a control message is sent from the second optical line termination device to the first optical network device such that the first optical network device is prevented from moving into initial state. Furthermore, the method comprises determining and setting timing settings for the first optical network device.
    Type: Grant
    Filed: August 14, 2013
    Date of Patent: December 23, 2014
    Assignee: Telefonaktiebolaget L M Ericsson (Publ)
    Inventor: Elmar Trojer
  • Patent number: 8917993
    Abstract: In general, techniques are described for monitoring downstream traffic in order to schedule delivery of upstream traffic in a computer network. The techniques may be implemented by an optical line terminal (OLT) comprising a control unit and an interface. The control unit determines an amount of upstream data that is waiting at one of a plurality of ONTs to be transmitted upstream to the OLT, and determines an amount of downstream data that is transmitted by the OLT to this ONT. The control unit increases the determined amount of upstream data based on the determined amount of downstream data transmitted by the OLT to the ONTs and, after increasing the determined amount of upstream data, generates an upstream grant map that grants time slots to the ONTs based on the determined amount of upstream data. The interface transmits the upstream grant map downstream to the ONTs.
    Type: Grant
    Filed: June 17, 2011
    Date of Patent: December 23, 2014
    Assignee: Calix, Inc.
    Inventors: Steven L. Timm, Mark R. Biegert
  • Patent number: 8909044
    Abstract: The present invention discloses a method for transmitting data and a gigabit-capable passive optical network system, which method comprises: a transmitter carrying indication information in an uplink or a downlink frame transmitted to a receiver for enabling the receiver to discard information which does not need to be processed by the receiver in the uplink or downlink frame according to the indication information. The data type transmitted by GPON systems is expanded and the idle bandwidth is effectively handled by the present invention.
    Type: Grant
    Filed: May 25, 2010
    Date of Patent: December 9, 2014
    Assignee: ZTE Corporation
    Inventors: Weiliang Zhang, Dan Geng
  • Patent number: 8886035
    Abstract: Proposed is an efficient method of configuration of a transmitter and a receiver for realizing an optical transmission/reception module apparatus including at least one transmission wavelength and two or more reception wavelengths over a time division multiple access passive optical network or an optical network using multiple transmission/reception wavelengths. Further, proposed is a method of configuration of an apparatus which enables optical alignment and assembly in a single package by using a single lens and three different WDM optical filters for a reception module capable of receiving four wavelengths.
    Type: Grant
    Filed: August 21, 2012
    Date of Patent: November 11, 2014
    Assignee: Electronics and Telecommunications Research Institute
    Inventors: Jong Deog Kim, Jong Jin Lee
  • Patent number: 8886043
    Abstract: The disclosure provides an optical network system, an Optical Line Terminal (OLT), an Optical Network Unit (ONU) and an Optical Distribution Network (ODN) apparatus. The system includes: an OLT configured to modulate and encode at least one line of time-division-multiplexed downlink signals, synthesize the downlink signals encoded into one line and then output it, receive uplink signals, and decode the uplink signals received and then output them; an ODN configured to separate the downlink signals received into multiple lines and then output them, synthesize the uplink signals received into one line, and then output it to the OLT; and ONUs configured to receive the downlink signals output from the ODN, decode the downlink signals received and output them, encode one line of time-division-multiplexed uplink signals, and output the uplink signals encoded to the ODN. Decoding of the downlink signals and encoding of the uplink signals can further be implemented by the ODN.
    Type: Grant
    Filed: August 24, 2010
    Date of Patent: November 11, 2014
    Assignee: ZTE Corporation
    Inventors: Biao Chen, Liang Cheng, Dawei Wang, Songlin Zhu, Dan Geng
  • Patent number: 8879913
    Abstract: The invention relates to a piece of customer premises equipment (CPE) comprising a physical connector (21) for linking to a broadband network and a distributing structure (NTU, 24) that is connected to said physical connector for distributing broadband elements over one or more service modules (RGUs A, B, C, D) for associated customer modules (CUEs E, F, G, H). According to the invention, said distributing structure (NTU, 24) comprises a plurality of mechanically modularly arranged connector facilities (25) at an interface between the distributing structure and the service modules so as to provide a repeatedly mechanically exchangeable connection for a service module (RGU) belonging to one service provider from a range of mutually distinct service providers each time. The distributing structure (NTU, 24) is further provided with means (26, 27) for making said mutually distinct service providers indiscriminately exchangeable among said connector facilities (25).
    Type: Grant
    Filed: January 13, 2011
    Date of Patent: November 4, 2014
    Assignee: Genexis B.V.
    Inventors: Maarten Egmond, Gerard Nicolaas Van Den Hoven, Paulus Ferdinand Joseph Schepers, Maurice Martinus De Laat, Jori Pieter Andre Spaa, Jacob Hendrik Martin Berends
  • Patent number: 8879914
    Abstract: A method and apparatus for controlling traffic in an optical network having a plurality of OLTs for communicating with a plurality of PONs. A traffic controller receives traffic information concerning current traffic volume and, preferably with reference to a rules database, calculates the number of OLTs required to support the current traffic volume. A separate determination may be made whether a network reconfiguration is permitted at this time. If a reconfiguration is permitted, the traffic controller configures a traffic control switch to route the PON traffic to an from only the calculated number of OLTs. The traffic control switch may be implemented using a voltage-controlled optical fiber coupling or electronically, routing the traffic as electrical signals to and from electro-optical converters associated with each PON. The OLTs to be used may be selected by the traffic controller.
    Type: Grant
    Filed: February 23, 2011
    Date of Patent: November 4, 2014
    Assignee: Alcatel Lucent
    Inventors: Dusan Suvakovic, Doutje Van Veen
  • Patent number: 8873960
    Abstract: A method for detecting faults and their locations in an optical path between an optical line terminal (OLT) of and optical network units (ONUs) of a passive optical network (PON). The method comprises forming a maintenance optical link through the PON between the OLT and a collocated ONU, the OLT and its collocated ONU are each connected to an optical splitter; sending a ranging request from the OLT to the collocated ONU; in response to the ranging request, receiving, over the maintenance optical line, a ranging burst signal including at least a fault analysis detection pattern (FADP); and analyzing the FADP in the received signal by auto-correlating the FADP signal with an expected FADP signal, an uncorrelated event measured through the auto-correlation is indicative of a fault in the optical path of the PON and occurrence times of such events are indicative of the fault's location in the optical path.
    Type: Grant
    Filed: July 25, 2011
    Date of Patent: October 28, 2014
    Assignee: Broadcom Corporation
    Inventors: Amiad Dvir, Eli Elmoalem
  • Patent number: 8861962
    Abstract: A method for enabling alternating current (AC) coupling of high-speed burst data signals transmitted by an optical network unit (ONU). The method comprises generating a first data pattern to be sent to an optical transceiver through an AC coupling circuit, wherein the first data pattern is a direct current (DC) balanced pattern; generating a second data pattern to be sent to the optical transceiver through the AC coupling circuit, wherein the second data pattern is output prior to transmission of a high-speed burst data signal; and generating a third data pattern to be sent to the optical transceiver through the AC coupling circuit, wherein the third data pattern is output posterior to the transmission of the high-speed burst data signal.
    Type: Grant
    Filed: April 4, 2013
    Date of Patent: October 14, 2014
    Assignee: Broadcom Corporation
    Inventors: Amiad Dvir, Asaf Koren, David Avishai
  • Patent number: 8861964
    Abstract: Methods and arrangements for time distribution in an optical network system in the upstream direction. The information of a selected time reference frame and a calculated time stamp value of the frame based on a real-time clock of the optical line terminal (OLT) is sent from the OLT to the optical network unit (ONU) via the optical distribution network (ODN). When the time reference frame is sent to the ONU from the OLT via the ODN, the ONU records the arrival time of the frame based on a time reference made by the real-time clock of the ONU. The time difference between the arrival time and the time stamp value is calculated whereupon the OLT is informed of the calculated time difference. The OLT adjusts the real-time clock of the OLT in accordance with the time difference.
    Type: Grant
    Filed: March 29, 2010
    Date of Patent: October 14, 2014
    Assignee: Telefonaktiebolaget L M Ericsson (publ)
    Inventors: Ling Chen, Shuyou Dong
  • Patent number: 8855491
    Abstract: A method for performing a protection in passive optical networks. The method comprises forming a protection maintenance link between an active optical line terminal (OLT) and a standby OLT; forming a synchronization link between the active OLT and the standby OLT; computing a base differential distance value; continuously measuring round trip time (RTT) values by the active OLT using the protection maintenance link; periodically sending at least RTT values calculated by the active OLT to the standby OLT over the synchronization link; and computing, by the standby OLT, a new RTT value based on at least a RTT value measured by the active OLT and a standby differential distance value, when a switch-over action is triggered, thereby allowing the standby OLT to serve optical network units (ONUs) in the PON without performing a ranging process.
    Type: Grant
    Filed: December 29, 2009
    Date of Patent: October 7, 2014
    Assignee: Broadcom Corporation
    Inventors: Eli Elmoalem, Amiad Dvir
  • Patent number: 8849122
    Abstract: Apparatus and methods for providing content to devices in a content distribution network. In one embodiment, a hybrid fiber/coax network provides optical signals to an amplification and combination node, the signals which are converted to radio frequency (RF) signals and transmitted to a series of cascading amplification and combination apparatus. The converted signals are combined with legacy RF signals at the combination apparatus, and distributed further downstream to serviced premises as well as other portions of the network cascade. Time division techniques are used to mitigate interference between the various amplification and combination nodes within the cascade. The programmable time division devices allow for rapid spectrum reallocation, and for insertion of different content at each different node of the network.
    Type: Grant
    Filed: April 19, 2012
    Date of Patent: September 30, 2014
    Assignee: Time Warner Cable Enterprises, LLC
    Inventor: Paul D. Brooks
  • Patent number: 8849120
    Abstract: Consistent with the present disclosure, an optical communication system, such as a passive optical network (PON), is provided that includes an optical line terminal (OLT) and a plurality of optical network units (ONUs). The OLT includes a plurality of photonic integrated circuits that have both optical transmitters and receivers provided therein. Accordingly, the OLT may have fewer components and a simpler, more reliable and cost-effective design than a conventional OLT including discrete components. In addition, various ONU configurations are provided that also have a simple design and fewer components. Thus, ONUs consistent with the present disclosure may also have reduced costs.
    Type: Grant
    Filed: January 10, 2011
    Date of Patent: September 30, 2014
    Assignee: Infinera Corporation
    Inventors: Radhakrishnan L. Nagarajan, Christopher C. Liou, Masaki Kato
  • Patent number: 8842990
    Abstract: A method performed in an optical line terminal (OLT) in a passive optical network (PON) for detecting a rogue optical network unit (ONU) operating among a plurality of ONUs in the PON. The OLT receives a plurality of bursts of light from a plurality of ONUs, each burst being separated from other bursts by an inter-burst gap containing a minimum dark interval during which the OLT expects to receive no optical power. The OLT measures the received optical power during one or more of the minimum dark intervals of the inter-burst gaps and determines whether the inter-burst gaps were anomalous. In response to determining that an inter-burst gap was anomalous, the OLT increments an anomaly count that indicates a rogue ONU has been detected when the anomaly count exceeds an anomaly count threshold. When the anomaly count is exceeded, the OLT declares an alarm associated with the presence of a rogue ONU, and may also initiate rogue isolation diagnostics.
    Type: Grant
    Filed: December 29, 2010
    Date of Patent: September 23, 2014
    Assignee: Telefonaktiebolaget L M Ericsson (Publ)
    Inventor: David Hood
  • Patent number: 8831425
    Abstract: A Data Over Cable Service Interface Specifications (DOCSIS) Passive Optical Network (PON) system (DPON) makes optical subscribers appear as cable subscribers. In one embodiment, a Cable Modem (CM) proxy is located in an Optical Line Termination (OLT). The OLT implements a cable modem protocol stack that operates as the CM proxy and communicates with a back office system. The OLT translates the data retrieved by the CM proxy into Optical Network Unit (ONU) recognizable commands, and sends the translated data to the ONU. In a second embodiment, the CM proxy is located in the ONU. The ONU implements the cable modem protocol stack that operates as the CM proxy and communicates with the back office system. The ONU translates the data retrieved by the CM proxy into ONU recognizable commands and sends the translated data to the ONU.
    Type: Grant
    Filed: January 9, 2008
    Date of Patent: September 9, 2014
    Assignee: Cisco Technology, Inc.
    Inventors: Alon Bernstein, John Chapman
  • Patent number: 8824890
    Abstract: The present invention relates to an open optical access network system in which one optical access network is open to enable a plurality of service providers and a plurality of subscribers to simultaneously use the optical access network, to thereby improve the efficiency of using the optical access network, wherein each subscriber can be provided with a plurality of different services from the plurality of service providers, thereby enabling the flexible selection of services and the flexible change in services, thus improving the efficiency of using an optical infrastructure.
    Type: Grant
    Filed: August 18, 2010
    Date of Patent: September 2, 2014
    Assignee: Electronics and Telecommunications Research Institute
    Inventors: Han-Hyub Lee, Seung-Hyun Cho, Eui-Suk Jung, Eun-Gu Lee, Jong-Hoon Lee, Jie-Hyun Lee, Sang-Soo Lee
  • 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