Bidirectional Patents (Class 398/72)
  • Patent number: 10887025
    Abstract: A system for powering a network element of a fiber optic wide area network is disclosed. When communication data is transferred between a central office (CO) and a subscriber terminal using a network element to convert optical to electrical (O-E) and electrical to optical (E-O) signals between a fiber from the central office and twisted wire pair, coaxial cable or Ethernet cable transmission lines from the subscriber terminal, techniques related to local powering of a network element or drop site by the subscriber terminal or subscriber premise remote powering device are provided. Certain advantages and/or benefits are achieved using the present invention, such as freedom from any requirement for additional meter installations or meter connection charges and does not require a separate power network.
    Type: Grant
    Filed: August 16, 2020
    Date of Patent: January 5, 2021
    Inventors: Alexander Soto, Walter Soto
  • Patent number: 10873173
    Abstract: In conventional hybrid lasers large back refection may lead to a degradation of relative intensity noise (RIN), linewidth broadening, mode hopping, etc. To solve the aforementioned problem a hybrid laser includes a mode converter for converting a higher-back-reflection mode of the light to a mode providing less back reflection to the gain chip. The mode converter may comprise a polarization rotator, a waveguide converter, or high-order mode converter. A routing waveguide may be provided including a phase shifter, e.g. a doped waveguide, for adjusting a cavity length of the laser cavity.
    Type: Grant
    Filed: June 12, 2019
    Date of Patent: December 22, 2020
    Assignee: Elenion Technologies, LLC
    Inventors: Hang Guan, Yang Liu, Ran Ding, Andreas Weirich, Michael J. Hochberg
  • Patent number: 10854092
    Abstract: A method and system for time-based viewing to coordinate airport collaborative decision making (A-CDM) events between a pilot and ground personnel on a cockpit display of an aircraft of generating a time scale with a list of A-CDM events of the aircraft during inbound, turnaround and outbound flight operations to an airport based sensor data contributed by aircraft systems and data of A-CDM event related to airport operations to generate a current time moving window in the time scale for identifying A-CDM events; generating a graphic user interface using the sensor data for positioning the current time moving window on the time scale; and collaboratively communicating with ground personnel decisions based on an aircraft state and a current A-CDM event identified by the positioning of the current time moving window in the time scale to expedite completion of a particular A-CDM event.
    Type: Grant
    Filed: September 20, 2019
    Date of Patent: December 1, 2020
    Assignee: HONEYWELL INTERNATIONAL INC.
    Inventors: Muthusankar Subramaniyan, Sivakumar Kanagarajan, Visvanathan Thanigai Nathan, Kiran Gopala Krishna, Mohammed Ibrahim Mohideen
  • Patent number: 10841009
    Abstract: A network element (200) of a cable television (CATV) network, comprising an input (204) for upstream signal transmission; at least two diplex filters (210, 212, 214) configured to be connected to said input (204), a first diplex filter (210) comprising a bandpass filter for a first upstream frequency band and a second diplex filter (212) comprising a bandpass filter for a second upstream frequency band; a switch (208) for connecting one of said at least two diplex filters to said input; wherein the network element is configured to be remotely controlled by a headend of the CATV network for selecting the diplex filter.
    Type: Grant
    Filed: April 15, 2016
    Date of Patent: November 17, 2020
    Assignee: Teleste Oyj
    Inventors: Kari Mäki, Timo Lummejoki, Anssi Mäkiranta
  • Patent number: 10826602
    Abstract: Concepts and technologies for multi-lane optical transport network recovery are provided herein. In an embodiment, a system includes a multi-lane optical transceiver. The multi-lane optical transceiver can include a transmitter optical sub-assembly, a receiver optical sub-assembly, and a controller that includes a processor and a memory that stores computer-executable instructions that, in response to execution by the processor, cause the processor to perform operations. The operations can include detecting an optical interruption event corresponding to an optical lane within a multi-lane optical path. The operations can further include instantiating an optical protocol alarm based on the optical interruption event. The operations can further include generating an optical protocol message based on the optical protocol alarm. The operations can further include instructing a peer multi-lane optical transceiver to alter optical transmission along the multi-lane optical path based on the optical protocol message.
    Type: Grant
    Filed: March 27, 2020
    Date of Patent: November 3, 2020
    Assignee: AT&T Intellectual Property I, L.P.
    Inventors: Andrew Edwards, Martin Birk, Kathleen Tse, Gary Armiento
  • Patent number: 10819460
    Abstract: An optical network is provided that includes at least one strand of a plurality of strands of optical fiber optically connected to a first fiber distribution hub and an access terminal. The at least one strand optically is also connected to a second fiber distribution hub and the access terminal. The at least one strand thus provides a full duplex optical path in a first direction from the first fiber distribution hub to the access terminal and in a second direction from the second fiber distribution hub to the access terminal.
    Type: Grant
    Filed: June 11, 2019
    Date of Patent: October 27, 2020
    Assignee: FRONTIER COMMUNICATIONS CORPORATION
    Inventor: Jonathan Gordon Lawrence
  • Patent number: 10778364
    Abstract: An ONU comprises a receiver configured to receive a continuous-mode TDMA downstream signal from an OLT; a PD coupled to the receiver and configured to convert the continuous-mode TDMA downstream signal to an electrical signal or an RF signal; an ADC coupled to the PD and configured to convert the electrical signal or the RF signal to a digital signal; and a burst-mode data recovery stage coupled to the ADC and configured to perform data recovery on a segment of the digital signal corresponding to the ONU, the burst-mode data recovery stage comprises a synchronization stage configured to perform synchronization on the segment.
    Type: Grant
    Filed: March 8, 2018
    Date of Patent: September 15, 2020
    Assignee: Futurewei Technologies, Inc.
    Inventors: Xiang Liu, Frank Effenberger, Huaiyu Zeng, Guozhu Long, Haixiang Liang
  • Patent number: 10775580
    Abstract: The present disclosure relates to a ruggedized/hardened fiber optic connection system designed to reduce cost. In one example, selected features of a fiber optic adapter are integrated with a wall (24) of an enclosure (22). The adapter comprises a sleeve port (26) into which an optical adapter subassembly is inserted. The subassembly comprises a sleeve part (44) which is inserted into the sleeve, a ferrule alignment sleeve (48) which is inserted into the sleeve part, a ferrule (55) with hub which is inserted into the alignment sleeve, and fixing clip (46) securing the ferrule with hub into the alignment sleeve and the sleeve part.
    Type: Grant
    Filed: March 7, 2019
    Date of Patent: September 15, 2020
    Assignee: CommScope Connectivity Belgium BVBA
    Inventor: Philippe Coenegracht
  • Patent number: 10756841
    Abstract: The present disclosure relates to passive optical network (PON) systems, optical line terminals (OTLs), and optical network units (ONUs). One example PON system includes an OLT and at least two ONUs. The OLT and the ONUs exchange data on one downstream channel and two upstream channels. The OLT sends downstream data to each ONU on the downstream channel, where the downstream data includes an upstream bandwidth grant used to control each ONU to send upstream data. Each ONU receives the downstream data on the downstream channel, and sends the upstream data on a first upstream channel or a second upstream channel based on the upstream bandwidth grant included in the downstream data. The OLT receives, on the first upstream channel and the second upstream channel, the upstream data sent by each ONU, where a registration function is disabled on the first upstream channel, and enabled on the second upstream channel.
    Type: Grant
    Filed: May 21, 2019
    Date of Patent: August 25, 2020
    Assignee: Huawei Technologies Co., Ltd.
    Inventors: Huafeng Lin, Jinrong Yin, Dianbo Zhao, Xifeng Wan, Shiwei Nie, Gang Zheng, Zhijing Luo, Xiaofei Zeng, Jun Luo
  • Patent number: 10735836
    Abstract: The present invention discloses a passive optical network communications method, apparatus and system. The method includes: receiving, by an optical network unit, a first message sent by an optical line terminal, where the first message carries backup wavelength channel ID information; switching, by the optical network unit, following the optical network unit detects a fault, an operating wavelength channel of the optical network unit to a backup wavelength channel identified by the backup wavelength channel ID information; and performing, by the optical network unit, data communication over the switched-to backup wavelength channel. In this way, fast protection switching of a passive optical network system is implemented and reliability of the system is improved.
    Type: Grant
    Filed: February 4, 2019
    Date of Patent: August 4, 2020
    Assignee: Huawei Technologies Co., Ltd.
    Inventor: Bo Gao
  • Patent number: 10638208
    Abstract: An intelligent subsystem includes/couples a radio transceiver, a voice processing module/voice processing algorithm and an intelligent learning algorithm. The intelligent subsystem can respond to a user's interests and/or preferences. Furthermore, the intelligent subsystem is sensor-aware or context-aware.
    Type: Grant
    Filed: August 5, 2019
    Date of Patent: April 28, 2020
    Inventor: Mohammad A. Mazed
  • Patent number: 10608745
    Abstract: A system that utilizes data over cable service interface specification (DOCSIS) over passive optical networks is disclosed. An example system includes core system in a passive optical network (PON), comprising a memory; and one or more processors configured to generate a downlink (DL) data stream comprising optical signals, in compliance with a data over cable service interface specification (DOCSIS); and provide the optical signals containing DL data to a network component in the PON over an optical fiber coupled between the core system and the network component. In some embodiments, the core system is located at a head end equipment at the internet service provider's facility. However, in other embodiments, the core system can have a distributed architecture, with a part of the core system located at the internet service provider's facility and a different part of the core system located at a different location.
    Type: Grant
    Filed: November 28, 2016
    Date of Patent: March 31, 2020
    Assignee: Intel Corporation
    Inventors: Shaul Shulman, Guy Ray, Amos Klimker, Avi Priev
  • Patent number: 10574378
    Abstract: A device and method for optical power measurement in an optical network supporting upstream and downstream signal propagation along an optical transmission path. An upstream wavelength analyzer receives upstream light extracted from the optical transmission path and is configured to determine an upstream spectral characteristic of the extracted upstream light. A downstream optical power meter assembly receives downstream light extracted from the optical transmission path and is configured to measure an optical power parameter of a downstream signal. A processing unit is configured to determine, based on the upstream spectral characteristic, at least one pass/fail threshold associated with the measured optical power parameter of the downstream signal.
    Type: Grant
    Filed: April 18, 2019
    Date of Patent: February 25, 2020
    Assignee: EXFO Inc.
    Inventors: Bernard Ruchet, Mario L'Heureux, Daniel Gariepy, Etienne Morin-Drouin
  • Patent number: 10541753
    Abstract: A hybrid optical-RF device, called a “stamp cell” herein, may be a small, passive repeating device that is designed to be placed close to User Equipment (UE) such that the UE only needs to reach a few meters using high frequency RF signals. The stamp cell may directly convert the received RF signal to an optical signal which may be transmitted to an optical receiver mounted on a traditional cell tower. Similarly, in the downlink direction, the stamp cell may receive optical signals from the cell tower and convert the optical signals to high frequency RF signals, which may be received by the UE.
    Type: Grant
    Filed: September 10, 2019
    Date of Patent: January 21, 2020
    Assignee: Verizon Patent and Licensing Inc.
    Inventor: Donna L. Polehn
  • Patent number: 10530906
    Abstract: The present disclosure is directed to systems, apparatuses, and methods for performing continuous or periodic link training. Existing link training protocols generally perform link training only once during startup or initialization of a link and, as a result, are limited in their applications. After link training is performed and Open Systems Interconnect (OSI) data link layer and other high-layer data is transmitted across the link, no further link training is performed using these existing link training protocols. However, parameters of the link may change over time after link training is performed, such as temperature of the link and voltage levels of signals transmitted over the link by the transmitter of the transmitter-receiver pair.
    Type: Grant
    Filed: October 30, 2017
    Date of Patent: January 7, 2020
    Assignee: Avago Technologies International Sales Pte. Limited
    Inventor: Adam Healey
  • Patent number: 10454588
    Abstract: An apparatus comprises a DAC configured to convert a digital electrical signal to an analog electrical signal and a laser coupled to the DAC. The laser is configured to generate an optical signal using the analog electrical signal for modulation, the optical signal is a band-multiplexed optical signal comprising frequency bands, the frequency bands comprise a lowest-frequency band, and the lowest-frequency band comprises a baseband IM signal. The laser is configured to transmit the optical signal. A PON comprises an OLT configured to transmit a downstream optical signal, the downstream optical signal is a band-multiplexed optical signal comprising a first band and a second band. The PON includes a first ONU configured to receive the downstream optical signal and equalize only the first band; and a second ONU configured to receive the downstream optical signal and equalize the first band and the second band.
    Type: Grant
    Filed: April 30, 2018
    Date of Patent: October 22, 2019
    Assignee: Futurewei Technologies, Inc.
    Inventors: Xiang Liu, Huaiyu Zeng, Andy Shen, Frank Effenberger
  • Patent number: 10454574
    Abstract: A system and method for performing an in-service optical time domain reflectometry test, an in-service insertion loss test, and an in-service optical frequency domain reflectometry test using a same wavelength as the network communications for point-to-point or point-to-multipoint optical fiber networks while maintaining continuity of network communications are disclosed.
    Type: Grant
    Filed: February 21, 2019
    Date of Patent: October 22, 2019
    Inventors: Alexander Soto, Walter Soto
  • Patent number: 10447405
    Abstract: An optical receiver includes: an optical demultiplexer to demultiplex an optical signal in which a plurality of wavelengths is multiplexed and divide the optical signal into optical signals corresponding to the plurality of wavelengths, respectively; a reflector to change a progress direction of the divided optical signals; an optical coupling lens including, in an array form, light transmission lenses through which the divided optical signals are transmitted, respectively; a plurality of photodetectors to mount on a photodiode (PD) substrate provided on the optical coupling lens, receive the divided optical signals that are transmitted through the light transmission lenses of the optical coupling lens, respectively, and convert the received optical signals to electrical signals; and a plurality of trans impedance amplifiers provided at desired intervals to electrically connect to the plurality of photodetectors through wire bonding and amplify the received plurality of electrical signals to be a desired magn
    Type: Grant
    Filed: June 29, 2018
    Date of Patent: October 15, 2019
    Assignee: ELECTRONICS AND TELECOMMUNICATIONS RESEARCH INSTITUTE
    Inventors: Sae-Kyoung Kang, Joon Young Huh, Joon Ki Lee, Jie Hyun Lee
  • Patent number: 10374746
    Abstract: A gigabit passive optical network (GPON) includes: at least one strand of optical fiber optically coupled to a fiber distribution hub and terminating at a termination port, the strand optically coupled to another termination port, the strand thus configured to provide a full duplex optical path for the GPON. A method of communication, a method of testing and a method of configuring a network are disclosed.
    Type: Grant
    Filed: October 10, 2017
    Date of Patent: August 6, 2019
    Assignee: FRONTIER COMMUNICATIONS CORPORATION
    Inventor: Jonathan Gordon Lawrence
  • Patent number: 10291970
    Abstract: In an optical system having multiple cascaded splitter/combiners, a trunk port and/or a drop port is configured for at least one of the splitter/combiner units. Drop ports may be configured with an average gain control, and the trunk ports may be configured to have individual gain control to provide a more precise overall gain and to maintain adequate signal levels. Embodiments apply to evolving RFoG architectures designed to serve a large number of subscribers without suffering from OBI (Optical Beat Interference) by retransmitting an optical signal through cascading splitters/combiners.
    Type: Grant
    Filed: December 29, 2016
    Date of Patent: May 14, 2019
    Assignee: ARRIS Enterprises LLC
    Inventors: Marcel F. Schemmann, Venkatesh G. Mutalik
  • Patent number: 10256939
    Abstract: A single-wavelength light path is selected between a source access node and a destination access node of a wavelength-division multiplexed optical network, including selecting an illuminated wavelength of the light path and selecting a start time and duration for a data transfer that would not interfere with other data transfers. If no start time/wavelength combination is available with duration sufficient to transport the data, an additional wavelength is automatically selected, based on modeling, that would not impair traffic being carried by other wavelengths in the network, and without a time-consuming manual process of the prior art. The scheduling process may include selecting a set of optical fibers, a wavelength, a start time and an end time to transport proposed traffic. A novel scheduler avoids checking every possible start time, thereby saving significant processing time. The scheduler schedules single-wavelength light paths, rather than relying on complex wavelength shifting schemes.
    Type: Grant
    Filed: July 30, 2018
    Date of Patent: April 9, 2019
    Assignee: Massachusetts Institute of Technology
    Inventors: Lei Zhang, Vincent W. S. Chan
  • Patent number: 10244295
    Abstract: The present invention discloses a passive optical network communications method, apparatus and system. The method includes: receiving, by an optical network unit, a first message sent by an optical line terminal, where the first message carries backup wavelength channel ID information; switching, by the optical network unit when the optical network unit detects a fault, an operating wavelength channel of the optical network unit to a backup wavelength channel identified by the backup wavelength channel ID information; and performing, by the optical network unit, data communication over the switched-to backup wavelength channel. In this way, fast protection switching of a passive optical network system is implemented and reliability of the system is improved.
    Type: Grant
    Filed: January 13, 2017
    Date of Patent: March 26, 2019
    Assignee: Huawei Technologies Co., Ltd.
    Inventor: Bo Gao
  • Patent number: 10237739
    Abstract: Various multiple methods of data transport, and combinations thereof, may be used to initialize or update conditional access information on various devices. In an integrated device having both a broadcast receiver, such as an SDARS receiver, and a two-way communications transceiver, such as an LTE, 3G, 4G or 5G modem, or the like, conditional access information for the broadcast receiver may be sent to the transceiver, and then passed to the broadcast receiver, or vice versa. Additionally, for example, the broadcast receiver may be sent, over the broadcast communications channel, a “wake-up” message for the two-way transceiver, which message may then be passed to the two-way transceiver, so as to make it ready to receive conditional access information over the two-way communications channel, or vice versa.
    Type: Grant
    Filed: February 2, 2016
    Date of Patent: March 19, 2019
    Assignee: Sirius XM Radio Inc.
    Inventors: Richard Andrew Michalski, Mark Rindsberg, Ashok Vadekar, Paul Marko, Craig Wadin
  • Patent number: 10230485
    Abstract: In a case where a wavelength to be assigned to a subscriber-side device, to which a downstream wavelength has been assigned, is to be changed from the currently used (Source) downstream wavelength to a different changeover target (Target) downstream wavelength, a downstream wavelength changeover instruction message that indicates the change target wavelength is generated. In a case where a wavelength to be assigned to the subscriber-side device, to which an upstream wavelength has been assigned, is to be changed from the currently used (Source) upstream wavelength to a different changeover target (Target) upstream wavelength, an upstream wavelength changeover instruction message that indicates the change target wavelength is generated. The downstream wavelength changeover instruction message and the upstream wavelength changeover instruction message are respectively independently generated, and only the wavelength for which the wavelength changeover instruction message was generated is changed.
    Type: Grant
    Filed: April 20, 2016
    Date of Patent: March 12, 2019
    Assignee: NIPPON TELEGRAPH AND TELEPHONE CORPORATION
    Inventors: Tomoaki Yoshida, Kota Asaka, Shunji Kimura
  • Patent number: 10225003
    Abstract: A system and method for performing an in-service optical time domain reflectometry test, an in-service insertion loss test, and an in-service optical frequency domain reflectometry test using a same wavelength as the network communications for point-to-point or point-to-multipoint optical fiber networks while maintaining continuity of network communications are disclosed.
    Type: Grant
    Filed: August 17, 2018
    Date of Patent: March 5, 2019
    Inventors: Alexander Soto, Walter Soto
  • Patent number: 10211945
    Abstract: A station-side device of the present invention includes: a wavelength change instruction unit that issues, to a subscriber-side device, a wavelength change instruction to change a transfer-source wavelength assigned to the subscriber-side device to a transfer-target wavelength different from the transfer-source wavelength; a transfer-source port that transmits and receives an optical signal of the transfer-source wavelength; a transfer-target port that transmits and receives an optical signal of the transfer-target wavelength; a transfer-source port monitoring unit that detects a connection between the transfer-source port and the subscriber-side device; a transfer-target port monitoring unit that detects a connection between the transfer-target port and the subscriber-side device; a transfer-source timer that counts, at the transfer-source port, an elapsed time from a predetermined starting time in response to the wavelength change instruction, and ends the counting of the elapsed time in a case where change
    Type: Grant
    Filed: April 20, 2016
    Date of Patent: February 19, 2019
    Assignee: NIPPON TELEGRAPH AND TELEPHONE CORPORATION
    Inventor: Tomoaki Yoshida
  • Patent number: 10187151
    Abstract: Embodiments of the disclosure relate to digital-analog interface modules (DAIMs) for flexibly distributing digital and/or analog communications signals in wide-area analog distributed antenna systems (DASs). In this regard, in one aspect, a DAIM is a multi-functional device capable of distributing the digital and/or analog communications signals to a local-area DASs in a wide-area DAS. The DAIM comprises an analog radio frequency (RF) communications signal interface for coupling with an analog signal source, a digital communications interface for coupling with a digital signal source, an analog local distribution interface for coupling with a remote antenna unit (RAU), and at least one digital remote distribution interface for coupling with a head-end unit (HEU) of the local-area DAS. By employing the DAIM in the wide-area DAS, it is possible to flexibly reconfigure the wide-area DAS for distributing digital and/or analog communications signals over the digital communications mediums.
    Type: Grant
    Filed: March 29, 2017
    Date of Patent: January 22, 2019
    Assignee: Corning Optical Communications Wireless Ltd
    Inventors: Dror Harel, Gavriel Mizrahi
  • Patent number: 10129614
    Abstract: The present invention discloses a passive optical network communications method: reporting, by an optical network unit, ONU, a calibration record of the ONU, where the calibration record includes an ID of a calibrated wavelength channel; sending a first message to the ONU when the OLT determines, according to the calibration record, that a target wavelength channel ID corresponding to a target wavelength channel to which the ONU needs to switch is not in the calibration record, where the first message includes a forced wavelength switching flag; and instructing the ONU to switch to the calibrated target wavelength channel. In this way, the ONU can implement wavelength switching quickly after calibrating a new wavelength channel so as to perform data communication over the calibrated new wavelength channel.
    Type: Grant
    Filed: February 13, 2017
    Date of Patent: November 13, 2018
    Assignee: Huawei Technologies Co., Ltd.
    Inventors: Bo Gao, Dekun Liu, Xuming Wu, Jianhe Gao
  • Patent number: 10091691
    Abstract: Techniques for dynamic backhaul bandwidth provisioning are described herein. For example, a method may include determining a potential subscriber user equipment load change, transmitting a backhaul bandwidth change request message based a potential subscriber UE load change, wherein the backhaul bandwidth change request message includes a requested backhaul bandwidth level, receiving a backhaul bandwidth change reply message in response to transmitting the backhaul bandwidth change request message, implementing a subscriber UE load change response corresponding to the potential subscriber UE load change based on receiving the backhaul bandwidth change reply message.
    Type: Grant
    Filed: April 14, 2017
    Date of Patent: October 2, 2018
    Assignee: Calix, Inc.
    Inventors: Harold Roberts, Steve Timm, Berkay Baykal
  • Patent number: 10084894
    Abstract: The present invention provides a method for managing a terminal device in a PON network. When a layer 3 network between an OLT and an ONU is disconnected, a layer 2 channel is established between the OLT and the ONU by extending an OAM protocol, and the ONU is managed by using the layer 2 channel. In this way, maintenance personnel do not need to go to a site to perform commissioning, and therefore, maintenance costs can be reduced.
    Type: Grant
    Filed: June 9, 2017
    Date of Patent: September 25, 2018
    Assignee: HUAWEI TECHNOLOGIES CO., LTD.
    Inventors: Linli Zhang, Wenjun Yao
  • Patent number: 10079642
    Abstract: A method and apparatus for transporting multiple low-speed data streams across a high-speed communication channel or link. In one embodiment of the method, first and second data streams are transmitted at first and second data transmission rates, respectively, via an optical cable, wherein the first and second data transmission rates are distinct. Components of the first data stream are transmitted via the optical cable between transmission of components of the second data stream via the optical cable, and components of the second data stream are transmitted via the optical cable between transmission of components of the first data stream via the optical cable.
    Type: Grant
    Filed: January 2, 2014
    Date of Patent: September 18, 2018
    Assignee: RENESAS ELECTRONICS AMERICA INC.
    Inventors: Peter Chu Tin Teng, Senthil K. Krishnamoorthy
  • Patent number: 10069567
    Abstract: An optical receiver receives signal light obtained by superimposing a second signal to a first signal according to a predetermined superimposition pattern. In the optical receiver, a tunable optical filter allows a part of a spectrum of the received light to pass, and a photodetector converts the transmission light into an electrical signal. A filter controller controls a center transmittance frequency of the tunable optical filter in response to a superimposed period and a non-superimposed period of the second signal identified based on the electrical signal. A superimposed signal detector detects the second signal based on the electrical signal obtained in response to the control of the tunable optical filter during the superimposed period. An optical signal-to-noise ratio (OSNR) calculator calculates an OSNR of the signal light based on the electrical signal obtained in response to the control of the tunable optical filter during the non-superimposed period.
    Type: Grant
    Filed: August 1, 2016
    Date of Patent: September 4, 2018
    Assignee: FUJITSU LIMITED
    Inventor: Goji Nakagawa
  • Patent number: 10009137
    Abstract: An optical communication system of the present invention switches a communication wavelength from a current communication wavelength to a auxiliary communication wavelength when an abnormality occurs in a communication wavelength between a station-side device and any one of a plurality of subscriber devices. Further, this optical communication system switches a communication wavelength used for communication between the subscriber device and the station-side device that perform communication using the auxiliary communication wavelength from the auxiliary communication wavelength back to the current communication wavelength when communication is recovered from an abnormality in the current communication wavelength.
    Type: Grant
    Filed: July 23, 2015
    Date of Patent: June 26, 2018
    Assignee: Nippon Telegraph And Telephone Corporation
    Inventors: Tomoaki Yoshida, Shin Kaneko, Shunji Kimura
  • Patent number: 9819437
    Abstract: An optical line terminal (OLT) comprises a target OLT channel termination (CT), and a source OLT CT in communication with the target OLT CT, wherein the source OLT CT is configured to exchange tuning messages with the target OLT CT to initiate upstream wavelength tuning of an optical network unit (ONU), wherein the source OLT CT is configured to transmit a tuning request to the ONU after the tuning messages have been exchanged and to receive a tuning acknowledgement message from the ONU indicating that the tuning request will be executed, wherein the source OLT CT is configured to transmit a broadcast notification message to all OLT CTs within the OLT, except for the source OLT CT, after receipt of the tuning acknowledge message from the ONU, and wherein the broadcast notification message includes a tuning time of the ONU.
    Type: Grant
    Filed: December 15, 2016
    Date of Patent: November 14, 2017
    Assignee: Futurewei Technologies, Inc.
    Inventors: Bo Gao, Yuanqiu Luo, Frank Effenberger, Jianhe Gao
  • Patent number: 9780908
    Abstract: Tuning an optical network unit (ONU) to an appropriate communication wavelength may be performed by initiating an activation procedure responsive to receiving a wavelength configuration message, and identifying an instruction in the wavelength configuration message to modify a present wavelength used by the network unit to a different wavelength. The process may also provide assigning an optical network unit identifier (ONU-ID) to the network unit, modifying the present wavelength to the different wavelength, and transmitting subsequent data messages from the network unit at the different wavelength.
    Type: Grant
    Filed: February 13, 2014
    Date of Patent: October 3, 2017
    Assignee: Alcatel Lucent
    Inventors: Peter Vetter, David A. Duque, Robert L. Farah, Joseph L. Galaro, Man Fai Lau, Wolfgang W. Poehlmann, Doutie T. van Veen, Haibo Wen
  • Patent number: 9749079
    Abstract: An ONU requests a bandwidth of an uplink signal, and in accordance with this, an OLT calculates a time when the OLT transmits the uplink signal and a transmission duration time and performs an instruction, and a DBA cycle in which the ONU transmits the uplink signal in accordance with the instruction and a dynamic wavelength allocation cycle in which the OLT instructs wavelength switching, and the ONU switches the wavelength and belongs to a different LC are separated. While the ONU switches the wavelength, the DBA cycles can be performed plural times in the ONU whose wavelength is not switched, the switching of the wavelength is confirmed after the wavelength has been switched, and then DBA operation is performed at the switched wavelength.
    Type: Grant
    Filed: December 6, 2013
    Date of Patent: August 29, 2017
    Assignee: NIPPON TELEGRAPH AND TELEPHONE CORPORATION
    Inventors: Tomoaki Yoshida, Shinya Tamaki, Shin Kaneko
  • Patent number: 9749076
    Abstract: The invention provides a method and apparatus for reconfiguring wavelength of the ONU. To be specific, the OLT sends a Deactivate_ONU-ID message to the ONU, the Deactivate_ONU-ID message including a reconfiguration flag, a new receive wavelength assigned for the ONU and a new transmit wavelength assigned for the ONU. After receiving the Deactivate_ONU-ID message from the OLT, the ONU discards the TC layer parameters related to the current wavelength channel, and determines whether the reconfiguration flag included in the Deactivate_ONU-ID message indicates the receive wavelength and the transmit wavelength of the ONU are required to be reconfigured. If so, then the ONU replaces its original receive wavelength and original transmit wavelength with its new receive wavelength and the new transmit wavelength included in the Deactivate_ONU-ID message, and enters initial state; and if not, then the ONU enters initial state directly.
    Type: Grant
    Filed: April 22, 2014
    Date of Patent: August 29, 2017
    Assignee: Alcatel Lucent
    Inventor: Haibo Wen
  • Patent number: 9712241
    Abstract: A communication system in which a master station device is connected to a plurality of slave station devices by an optical transmission line and a plurality of wavelengths are used to perform at least one of downstream communication and upstream communication. The master station device includes: a control unit that assigns a wavelength to be used in communication to the slave station device, and that generates a control signal for notifying the slave station device of the assigned wavelength; and an optical transmitter that transmits the control signal generated by the control unit to the slave station device. The slave station device includes an optical receiver and an optical transmitter that carry out communication with the master station device using the wavelength based on the control signal received from the master station device.
    Type: Grant
    Filed: January 15, 2013
    Date of Patent: July 18, 2017
    Assignee: Mitsubishi Electric Corporation
    Inventors: Hiroaki Mukai, Koshi Sugimura
  • Patent number: 9705626
    Abstract: An ONU requests a bandwidth of an uplink signal, and in accordance with this, an OLT calculates a time when the OLT transmits the uplink signal and a transmission duration time and performs an instruction, and a DBA cycle in which the ONU transmits the uplink signal in accordance with the instruction and a dynamic wavelength allocation cycle in which the OLT instructs wavelength switching, and the ONU switches the wavelength and belongs to a different LC are separated. While the ONU switches the wavelength, the DBA cycles can be performed plural times in the ONU whose wavelength is not switched, the switching of the wavelength is confirmed after the wavelength has been switched, and then DBA operation is performed at the switched wavelength.
    Type: Grant
    Filed: December 6, 2013
    Date of Patent: July 11, 2017
    Assignee: NIPPON TELEGRAPH AND TELEPHONE CORPORATION
    Inventors: Tomoaki Yoshida, Shinya Tamaki, Shin Kaneko
  • Patent number: 9680575
    Abstract: A relay device includes a relay processing unit that relays a downstream frame received by a first transceiver to a second transceiver, and relays an upstream frame received by the second transceiver to the first transceiver; and a control unit that follows upstream multiple access control performed by a station side device in a first line, for transmission of the upstream frame to be transmitted by the first transceiver to the station side device, and independently performs upstream multiple access control for reception of the upstream frame received by the second transceiver from a home side device in a second line. The control unit reports an amount of data that the home side device in the second line will be allowed to transmit, to the station side device in the first line before the data arrives at the second transceiver.
    Type: Grant
    Filed: August 21, 2013
    Date of Patent: June 13, 2017
    Assignee: SUMITOMO ELECTRIC INDUSTRIES, LTD.
    Inventors: Kazuhisa Yamashita, Toru Inoue
  • Patent number: 9634803
    Abstract: An optical subcarrier multiplex system. An input data signal is jointly coded with at least one forward error correction (FEC) code before symbol mapping and before subcarrier modulation. Joint FEC coding mitigates non-uniform subcarrier performance.
    Type: Grant
    Filed: February 16, 2016
    Date of Patent: April 25, 2017
    Assignee: TYCO ELECTRONICS SUBSEA COMMUNICATIONS LLC
    Inventors: Jin-Xing Cai, Matthew V. Mazurczyk, Hussam G. Batshon, Dmitri Foursa, Alexei N. Pilipetskii
  • Patent number: 9608755
    Abstract: The present disclosure provides Network Element (NE) clock synchronization using Optical Transport Network (OTN) delay measurement systems and methods such as described in ITU-T G.709 (December 2009) “Interfaces for the Optical Transport Network (OTN)” and G.798 (October 2010) “Characteristics of optical transport network hierarchy equipment functional blocks”. OTN provides a Delay Measurement (DM) function to measure fiber path latency between two network elements to within microsecond accuracy. The convergence of packet switching and OTN transport into the same network element allows the sharing of this information between the two applications. The OTN delay measurement value can be used to synchronize two network element clocks to within microsecond accuracy without the need for a costly GPS synchronization solution or reduced accuracy NTP solutions.
    Type: Grant
    Filed: February 23, 2011
    Date of Patent: March 28, 2017
    Assignee: Ciena Corporation
    Inventor: Jeffrey Scott Moynihan
  • Patent number: 9554284
    Abstract: A system for communicating wireless signals includes a passive optical network (PON) between a central office (CO) and network subscribers. The CO has an optical line terminal (OLT) and a wireless base station. An RF/Optic converter converts base station radio frequency (RF) signals to and from corresponding optical signals. An optical combiner combines signals of the OLT and signals of the RF/Optic converter for communication over the PON with at least one optical network unit (ONU) at a location of one or more of the network subscribers, so that signals of the OLT and converted wireless base station signals are carried together over the PON. A fiber mounted wireless antenna unit (FMCA) having an optical interface and a wireless antenna, and communicating wireless signals of the wireless antenna with the ONU, including performing conversions between wireless RF signals and optical signals.
    Type: Grant
    Filed: September 24, 2007
    Date of Patent: January 24, 2017
    Assignee: ALVARION LTD.
    Inventors: Mordechai Gejbrowitz, Mordechai Zussman, Dan Sade, Gil Shacham
  • Patent number: 9525507
    Abstract: A method of tuning a wavelength in a TWDM-PON which has a plurality of operable channels is provided. First, a second channel is added as an operating channel of the TWDM-PON in which at least a first channel is working, and then an OLT that is providing a service to an ONU through the first channel requests the ONU to tune to the second channel. In response to receiving the request, the ONU determines whether a downstream wavelength of the second channel has been recorded thereon. According to the determination result, the ONU sends to the OLT an ACK message that indicates that the ONU is able to perform wavelength tuning and then commences wavelength tuning to the second channel, or the ONU sends to the OLT a NACK message that indicates that the ONU is unable to perform wavelength tuning.
    Type: Grant
    Filed: June 16, 2015
    Date of Patent: December 20, 2016
    Assignee: ELECTRONICS AND TELECOMMUNICATIONS RESEARCH INSTITUTE
    Inventors: Han Hyub Lee, Kwang Ok Kim, Kyeong Hwan Doo, Sang Soo Lee
  • Patent number: 9525506
    Abstract: An optical line terminal (OLT) comprises a target OLT channel termination (CT), and a source OLT CT in communication with the target OLT CT, wherein the source OLT CT is configured to exchange tuning messages with the target OLT CT to initiate upstream wavelength tuning of an optical network unit (ONU), wherein the source OLT CT is configured to transmit a tuning request to the ONU after the tuning messages have been exchanged and to receive a tuning acknowledgement message from the ONU indicating that the tuning request will be executed, wherein the source OLT CT is configured to transmit a broadcast notification message to all OLT CTs within the OLT, except for the source OLT CT, after receipt of the tuning acknowledge message from the ONU, and wherein the broadcast notification message includes a tuning time of the ONU.
    Type: Grant
    Filed: April 22, 2015
    Date of Patent: December 20, 2016
    Assignee: Futurewei Technologies, Inc.
    Inventors: Bo Gao, Yuanqiu Luo, Frank Effenberger, Jianhe Gao
  • Patent number: 9490898
    Abstract: A communication system in which a master station device is connected to a plurality of slave station devices by an optical transmission line and a plurality of wavelengths are used to perform at least one of downstream communication and upstream communication. The master station device includes: a control unit that assigns a wavelength to be used in communication to the slave station device, and that generates a control signal for notifying the slave station device of the assigned wavelength; and an optical transmitter that transmits the control signal generated by the control unit to the slave station device. The slave station device includes an optical receiver and an optical transmitter that carry out communication with the master station device using the wavelength based on the control signal received from the master station device.
    Type: Grant
    Filed: January 15, 2013
    Date of Patent: November 8, 2016
    Assignee: Mitsubishi Electric Corporation
    Inventors: Hiroaki Mukai, Koshi Sugimura
  • Patent number: 9479284
    Abstract: A discovery method, an optical communication method, and an optical communication system which can reduce an error of RTTs when an identifier is fixed after an allocated wavelength has been changed in wavelength-tunable WDM/TDM-PON and can prevent lowering of the bandwidth utilization efficiency. A table, in which a correspondence between child nodes and fixed identifiers as well as the RTTs of a frame with each of the identifiers in all combinations of allocated wavelengths are recorded, is created through a discovery process.
    Type: Grant
    Filed: December 3, 2013
    Date of Patent: October 25, 2016
    Assignee: NIPPON TELEGRAPH AND TELEPHONE CORPORATION
    Inventors: Shin Kaneko, Shunji Kimura, Shinya Tamaki
  • Patent number: 9391734
    Abstract: Provided is a network system including a subscriber apparatus and a station-side apparatus connected with the subscriber apparatus via an optical line. The subscriber apparatus includes a transceiver for receiving an instruction to change wavelengths for signals to be sent and received, receiving a downstream signal sent from the station-side apparatus and having a wavelength designated by the instruction, and sending an upstream signal having a wavelength designated by the instruction to the station-side apparatus. The subscriber apparatus includes a controller for identifying at least one property of the received downstream signal and determining wavelengths for signals to be sent and received based on the identified at least one property.
    Type: Grant
    Filed: July 31, 2014
    Date of Patent: July 12, 2016
    Assignee: Hitachi, Ltd.
    Inventors: Jun Sugawa, Toshiyuki Odaka
  • Patent number: 9380320
    Abstract: Frequency domain sample adaptive offset (SAO). Video processing of a first signal operates to generate a second video signal such that at least one characteristic of a first portion of video information of the first video signal is replicated in generating a second portion of video information, such that the first portion of video information and the second portion of video information undergo combination to generate the second video signal. Such use of the first video signal may involve replication and scaling of the first video information to generate the second portion of video information. One possible characteristic of the first portion of video information may correspond to an energy profile as a function of frequency. One or more portions of the first video signal may be employed to generate different respective portions of the second signal. Such video processing operations may be performed on a block by block basis.
    Type: Grant
    Filed: September 20, 2012
    Date of Patent: June 28, 2016
    Assignee: BROADCOM CORPORATION
    Inventors: Ba-Zhong Shen, Wade K. Wan, Peisong Chen
  • Patent number: 9374157
    Abstract: A method is provided for detecting movement indicative of intrusion events on optical drop fibers of a network where the individual drop fiber can be identified to locate the event. The method uses a monitor system at the network end and multiplexing the monitor signal along the individual fibers to the respective terminals. At each of the terminals, the monitor signal is returned unchanged or in modified form along the same or different fibers to the network end. At the network end the received monitor signals is analyzed for changes in said monitor signals indicative of movement. Which one or more of the drop fibers has triggered the alarm is determined by modifying the monitor signal in wavelength or polarization, or by applying a modulation at the source and/or at multiplexing and/or at returning so that the monitor signal of one drop fiber has a difference from the monitor signal of another drop fiber.
    Type: Grant
    Filed: August 12, 2014
    Date of Patent: June 21, 2016
    Assignee: Network Integrity Systems, Inc.
    Inventors: Cary R. Murphy, Mark K. Bridges, David E. Vokey, Daniel Goertzen, Joseph Giovannini