Including Subscribers Patents (Class 398/71)
  • Patent number: 8270832
    Abstract: A method, apparatus and system for aligning frames in which an Optical Network Unit (ONU) receives a frame comprising frame delimitation information and synchronization-related information; performs a first verification based on a comparison of the frame delimitation information and a fixed pattern; performs a second verification based on a comparison of the synchronization-related information and a value associated with synchronization-related information in a previously received frame; proceeds to a synchronization state if both the first verification and the second verification are successful; and returns to a hunt state if either the first verification or the second verification fails.
    Type: Grant
    Filed: December 22, 2011
    Date of Patent: September 18, 2012
    Assignee: FutureWei Technologies, Inc.
    Inventors: Yuanqiu Luo, Frank Effenberger
  • Patent number: 8260140
    Abstract: An optical network component, architecture and method for a wavelength division multiplexed passive optical network includes a band coupler configured to demultiplex first and second wavelength division multiplexed content transmitted from an optical line terminal into a first band signal and a second band signal. An arrayed wavelength grating is configured to receive the first band signal and to further demultiplex the first band signal into different wavelengths to provide a plurality of wavelength signals. An optical splitter is configured to split the second band signal into sub-signals and multiplex the sub-signals with each of the wavelength signals such that the first and second wavelength division multiplexed content is provided on a single wavelength to a user.
    Type: Grant
    Filed: November 15, 2007
    Date of Patent: September 4, 2012
    Assignee: NEC Laboratories America, Inc.
    Inventors: Yuanqiu Luo, Jianjun Yu, Junqiang Hu, Lei Xu, Philip Nan Ji, Ting Wang, Milorad Cvijetic
  • Patent number: 8254292
    Abstract: A method and an apparatus for implementing a storage function in a passive optical network (PON) system. On the basis of a LINK ID held by the data, data requiring storage, e.g. data making exclusive use of a wide bandwidth such as audiovisual data and large-volume data packages, are determined among all the data sent to an optical network unit. These data requiring storage are stored in a storage device installed in the optical network unit. In case the user requests data stored in the storage device, the stored data are transferred directly to the user, without any need to request and send these data for the second time via an IPTV server and the core network. It is possible to avoid duplicate transfers of data, and in particular to avoid duplicate transfers of data making exclusive use of a comparatively wide bandwidth such as audiovisual data and large-volume data packages, to improve the utilization factor of the downlink bandwidth, and to reduce flow congestion and data delays.
    Type: Grant
    Filed: January 14, 2010
    Date of Patent: August 28, 2012
    Assignee: Hitachi, Ltd.
    Inventors: Hiroki Ikeda, Na Zhang
  • Patent number: 8244130
    Abstract: An optical line terminal connecting with numbers of optical network units comprises a control unit which controls each optical network unit to make it operate in a first mode in which transmission and reception of control messages and data are possible or in a second mode in which the transmission and reception of control messages are possible but the transmission of data is impossible, according to a communication permission request transmitted from an optical network unit and based on a preset maximum number of optical network units permitted to execute upstream communication from the optical network unit to the optical line terminal.
    Type: Grant
    Filed: April 18, 2008
    Date of Patent: August 14, 2012
    Assignee: Hitachi, Ltd.
    Inventors: Ying Shi, Hideya Yoshiuchi, Hiroki Ikeda
  • Patent number: 8238756
    Abstract: A passive optical network is provided, which includes an optical central office connected to a line termination device by a branch of the network including a passive amplification medium. The central office is adapted to send/receive a first data optical signal and has a first amplifier for sending a second amplification optical signal. The second signal exciting the amplification medium to amplify the optical power of an optical signal. The line termination device is adapted to receive the first optical signal, modulate the second amplification optical signal; and inject the modulated second signal into the network.
    Type: Grant
    Filed: July 17, 2007
    Date of Patent: August 7, 2012
    Assignee: France Telecom
    Inventors: Naveena Genay, Erwan Pincemin, Bertrand Le Guyader
  • Patent number: 8224181
    Abstract: The invention relates to a protection device for removing signal interference in a passive optical network and to a corresponding passive optical network and to a method for removing signal interference in a passive optical network.
    Type: Grant
    Filed: April 19, 2007
    Date of Patent: July 17, 2012
    Assignee: Nokia Siemens Networks GmbH & Co. KG
    Inventors: Harald Rohde, Dominic Schupke
  • Patent number: 8212375
    Abstract: The invention is directed to an optical network terminal (ONT) for use in a passive optical network (PON) that provides reliable battery status reporting and, optionally, remote monitoring and configuration of an uninterruptible power supply (UPS) unit. In particular, the UPS unit provides power to the ONT via a power line and transmits data to the ONT via the power line. Generally, the described invention supports one-way or two-way communication of status, alarm, and configuration signals using a single power line. Specifically, such signals may be transmitted over the power line by inserting a carrier frequency, such as a carrier frequency of approximately 1 MHz, onto the power line. In this manner, the invention may provide a simple battery status monitoring system while also reducing the cost of installation.
    Type: Grant
    Filed: August 7, 2008
    Date of Patent: July 3, 2012
    Assignee: Calix, Inc.
    Inventors: Mark T. Paulsen, Mark R. Biegert, Clifford Vrla, Gary L. Steinkogler
  • Patent number: 8208809
    Abstract: A system and method for data synchronization in Passive Optical Networks are disclosed. According to an embodiment, the present invention provides a method for providing upstream data synchronization in an optical communication network. The method includes sending data from an Optical Network Unit. The data includes a first data frame, which includes a header sequence, a synchronization segment, and a data segment. The synchronization segment includes 66 bits, which includes a first number of bits having nonzero values and a second number of bits having a value of zero. The first number is different from the second number. The method further includes receiving at least the first data frame by an Optical Line Terminal. The method also includes processing the first data frame. The method additionally includes selecting a first segment of the first data frame, the first segment including 66 bits.
    Type: Grant
    Filed: October 12, 2009
    Date of Patent: June 26, 2012
    Assignee: Huawei Technologies Co., Ltd.
    Inventors: Raymond W. K. Leung, Dongyu Geng, Dongning Feng, Frank J. Effenberger, Sergio Benedetto, Guido Montorsi, Jing Li
  • Patent number: 8208810
    Abstract: A method, apparatus and system for bearing Internet Protocol (IP) packets over a Passive Optical Network (PON) are disclosed. The method includes obtaining an IP packet, converting the IP packet into a Gigabit PON Encapsulation Method (GEM) frame. The method further includes performing a Gigabit PON Transmission Convergence (GTC) framing on the GEM frame to obtain a GTC frame and performing a PON physical layer processing on the GTC frame.
    Type: Grant
    Filed: December 30, 2009
    Date of Patent: June 26, 2012
    Assignee: Huawei Technologies Co., Ltd.
    Inventor: Ruobin Zheng
  • Patent number: 8208811
    Abstract: A first node receives a first phase modulated optical signal at a first wavelength from a master node. The first node also transmits a first amplitude modulated optical signal to the master node at the first wavelength using a portion of the first phase modulated optical signal as a light source.
    Type: Grant
    Filed: December 12, 2005
    Date of Patent: June 26, 2012
    Assignee: Verizon Business Global LLC
    Inventors: Tiejun J. Xia, Glenn A. Wellbrock
  • Patent number: 8195047
    Abstract: A Cable Television optical fiber communication system is disclosed, comprises a provider end, plural optical signal transmission devices and plural user ends, each optical signal transmission device is provided between the provider end and the user ends and has an light splitting element, a RF receive module, and a RF return module. The light splitting element is connected to the provider end via an optical transmission wire and is served to bi-directionally transfer a laser beam having a signal between the provider end and the user ends. The RF receive module is served to transfer a first signal of the provider end to the user ends. The RF return module emits a laser beam having a second signal to the provider end only when an analog return signal is emitted from the user end.
    Type: Grant
    Filed: April 27, 2009
    Date of Patent: June 5, 2012
    Inventor: Huitsuo Chou
  • Patent number: 8180221
    Abstract: The present invention relates to a wavelength-division multiplexed passive optical network (WDM-PON) for reducing degradation in noise characteristic of a wavelength-locked Fabry-Perot Laser Diode (F-P LD).
    Type: Grant
    Filed: August 29, 2006
    Date of Patent: May 15, 2012
    Assignee: Korea Advanced Institute of Science and Technology
    Inventors: Chang-Hee Lee, Sil-Gu Mun, Kun-Youl Park
  • Patent number: 8179910
    Abstract: A network device comprising asymmetric, multi-rate, Ethernet MAC and asymmetric, multi-rate, Ethernet PHY communicates signals via a network utilizing A/V bridging services. Higher bandwidth A/V signals are communicated and lower bandwidth signals are received or vice versa. Signals are communicated based on a plurality of different Ethernet protocols and/or data rates. Signals may be communicated based on 10GBASE-T in a first direction and based on a lower rate Ethernet protocol in a second direction. Extended range mode may be utilized. PDUs comprise time stamps, traffic class designations and/or destination addresses. Data rate requests, resource reservation messages and/or registration for delivery of PDUs may be communicated. Time stamps enable end to end transport within a specified latency target. Video signals may be compressed, uncompressed, encrypted, unencrypted and/or formatted for a video display interface.
    Type: Grant
    Filed: November 9, 2010
    Date of Patent: May 15, 2012
    Assignee: Broadcom Corporation
    Inventors: Wael William Diab, Yong Kim, Scott Powell
  • Patent number: 8180220
    Abstract: A protocol configuration method for use by a substation to be coupled to a main station in an optical access network is described.
    Type: Grant
    Filed: December 12, 2005
    Date of Patent: May 15, 2012
    Assignee: Alcatel Lucent
    Inventors: Tom Van Caenegem, Edwin Augustus Philomena Ringoot
  • Patent number: 8180222
    Abstract: Transmitting and receiving data includes a process of transferring data over a coaxial network between an optical node and a plurality of cable modems of a hybrid fiber-coaxial cable network. A data transfer system which sends and receives data over a coaxial network located at an optical node of a hybrid fiber-coaxial cable network.
    Type: Grant
    Filed: August 17, 2010
    Date of Patent: May 15, 2012
    Assignee: Aurora Networks, Inc.
    Inventors: Guy Sucharczuk, Oleh J Sniezko, Krzysztof Pradzynski, Thomas K Fong
  • Patent number: 8160457
    Abstract: A system is disclosed for an improved ROSA that has increased sensitivity for permitting greater numbers of ONTs to be connected to an optical network per defined transmission line distances. The ROSA configuration includes a digital optical module with improved performance characteristics. This digital optical module has replaced a conventional photodiode with a PIN detector that is coupled with the TIA. The resulting digital optical module containing this PIN/TIA configuration when incorporated in a ROSA provides a single ROSA solution that will meet or exceed the ITU/IEEE FTTx standards for short and long distances under substantially all operating conditions.
    Type: Grant
    Filed: February 4, 2008
    Date of Patent: April 17, 2012
    Assignee: Phyworks
    Inventors: Simon McCaul, Stuart Millard
  • Patent number: 8155528
    Abstract: Methods for authenticating an optical transceiver module to a host are disclosed. The transceiver comprises a receive signal line for transferring data from the transceiver to the host and a transmit signal line for transferring data from the host to the transceiver in preparation for transmission to a communications network. The transceiver includes a controller having a processor in communication with the host, and a first memory register assignable by the processor. A consolidated laser driver/post amplifier is also included and features a pattern generator and a data switch. The pattern generator produces a string of bit values that serve as an authenticating data portion. The data switch selectively inputs the authenticating data portion to the receive signal line of the transceiver according to the state of the first memory register, enabling the authenticating data portion to be received by the host, thereby authenticating the transceiver.
    Type: Grant
    Filed: August 30, 2010
    Date of Patent: April 10, 2012
    Assignee: Finisar Corporation
    Inventor: Stephen T. Nelson
  • Patent number: 8139940
    Abstract: There is provided a wavelength division multiplexing transmission system and apparatuses used therein, in which a remote apparatus to be newly added to a station apparatus autonomously sets a wavelength to be used in the remote apparatus, thereby avoiding the need for presetting a wavelength to be used in the remote apparatus. The remote apparatus includes wavelength determining means that determines an available wavelength on the basis of an optical signal received from the station apparatus. The wavelength determining means may determine the wavelength of an unreceived optical signal as the available wavelength or may determine the wavelength of a received optical signal as the available wavelength, and may set that wavelength as a transmission and reception wavelength to be used in the remote apparatus.
    Type: Grant
    Filed: December 4, 2009
    Date of Patent: March 20, 2012
    Assignee: NEC Corporation
    Inventor: Shigekazu Harada
  • Patent number: 8121479
    Abstract: A network component is disclosed that includes a memory comprising a data structure comprising an optical network terminal management and control interface (OMCI) comprising a plurality of managed entities (MEs), wherein one of the MEs is a description of the OMCI. Also disclosed is a network component comprising a processor configured to implement a method comprising promoting the sending of an OMCI Description to an optical line terminal (OLT), wherein the OMCI Description comprises an OMCI Object, whose instance describes the types of MEs supported by an OMCI, a plurality of Managed Entity Objects, whose instances describe each ME supported by the OMCI, and a plurality of Attribute Objects, whose instances describe each attribute supported by the OMCI.
    Type: Grant
    Filed: February 21, 2007
    Date of Patent: February 21, 2012
    Assignee: Futurewei Technologies, Inc.
    Inventor: Frank J. Effenberger
  • Patent number: 8107814
    Abstract: Upstream data handling in a digital Data Over Cable Service Interface Specification (DOCSIS) passive optical network (DPON). Embodiments include receiving at a headend, in an upstream path over an optical network, a plurality of digitized and serialized DPON upstream packets respectively distributed in a time division multiplexed fashion, wherein each DPON upstream packet includes a header, a trailer and a payload, monitoring the optical network for energy in the upstream path, including energy associated with a header and a trailer of respective DPON upstream packets, controlling a bit stuffer that adds bits to the upstream path to (1) stop adding bits to the upstream path when energy is detected in the upstream path and (2) resume adding bits to the upstream path after an end of a trailer of a given DPON upstream packet has been detected, and removing the header and the trailer of the respective DPON upstream packets.
    Type: Grant
    Filed: July 25, 2008
    Date of Patent: January 31, 2012
    Assignee: Cisco Technology, Inc.
    Inventors: Thai-Bao H. Kien, Amin Farvez, Richard J. Futch, Richard T. Causey, Michael Jones
  • Patent number: 8107815
    Abstract: In one embodiment, a method for providing wireless communications utilizing a passive optical network (PON) is disclosed. The method includes receiving, at a PON, downstream packets from a base station destined for a mobile station, and transmitting the downstream packets to wireless transceivers associated with PON. The method also includes receiving, at the first wireless transceiver communicatively coupled to a first optical network terminal (ONT), the downstream packets from the first ONT and transmitting a first wireless signal comprising the downstream packets to a first cell. The method also includes receiving, at a second wireless transceiver communicatively coupled to a second ONT, the downstream packets from the second ONT and transmitting a second wireless signal comprising the downstream packets to a second cell.
    Type: Grant
    Filed: March 31, 2008
    Date of Patent: January 31, 2012
    Assignee: Fujitsu Limited
    Inventors: Youichi Akasaka, Takao Naito, Satoshi Mizutani
  • Patent number: 8095002
    Abstract: A method and corresponding apparatus for diagnosing problems on a time division multiple access (TDMA) optical distribution network (ODN) is provided. An example method may include: (i) measuring no-input signal power level on a communications path configured to carry upstream communications between multiple optical network terminals (ONTs) and an optical line terminal (OLT) in a passive optical network (PON) at a time no upstream communications are on the communications path from the ONTs to the OLT; (ii) comparing the measured no-input signal power level to a threshold; and (iii) generating a notification in an event the threshold is exceeded. Through the use of this method, faults in optical transmitters, such as bad solder joints, can be determined. Such faults may cause errors in parameters, such as ranging or normalization parameters, associated with communications. By determining the faults, the time required to resolve communications errors can be reduced.
    Type: Grant
    Filed: August 31, 2006
    Date of Patent: January 10, 2012
    Assignee: Tellabs Pataluma, Inc.
    Inventors: Joseph D. Miguel, David A. DeLew
  • Patent number: 8086103
    Abstract: Dynamic optical wavebands are disclosed that allow a plurality of user streams having a common destination node to be positioned in a substantially adjacent non-overlapping manner on a spectrum for treatment as a routable entity. Each waveband has an associated center wavelength and spectral extent. The plurality of user streams can optionally be encrypted using a corresponding cipher. Wavebands that are received by a network node are filtered so that individual wavebands can be isolated, if necessary. For example, individual wavebands can be switched to an appropriate output node for forwarding in the optical network. In addition, the center wavelength and spectral extent of a waveband can be converted, if necessary, to position the waveband substantially spectrally adjacent to another waveband sharing a common path portion. In this manner, the substantially spectrally adjacent wavebands can be treated as an aggregated waveband for the common portion of a path.
    Type: Grant
    Filed: April 29, 2004
    Date of Patent: December 27, 2011
    Assignee: Alcatel Lucent
    Inventors: Marc J. Beacken, Dominick J. Imbesi
  • Patent number: 8073329
    Abstract: The present disclosure discloses a passive optical network (PON) user terminal comprising a passive optical network interface unit (PONIU) having access to a PON system, a service data distribution unit (SDDU) connected to the PONIU for distributing service data, a plurality of service processing units (SPUs) for receiving and accordingly processing the service data distributed by the SDDU, a power source for providing power to the above units, and a power supply control unit (PSCU) for controlling the activating/deactivating of the energy-saving power supply to the SPUs, the SDDU, and the PONIU. The present disclosure further provides a method for controlling the PON power supply and for reporting the power supply state. The present disclosure allows control of the energy usage of the PON user terminal to save power when a service in the PON user terminal is not used or when the user terminal uses a backup power source to supply power.
    Type: Grant
    Filed: December 18, 2006
    Date of Patent: December 6, 2011
    Assignee: Huawei Technologies Co., Ltd.
    Inventors: Hai Gao, Yinghua Dong
  • Patent number: 8059962
    Abstract: An apparatus comprising a plurality of data framers, a time division multiplexer coupled to the data framers, and an optical transmitter coupled to the time division multiplexer. Also disclosed is an apparatus comprising an optical receiver, a time division demultiplexer coupled to the optical receiver, and a data framer coupled to the time division demultiplexer. Also disclosed is an apparatus comprising at least one component configured to implement a method comprising combining a first plurality of data frames corresponding to a first plurality of channels into a first plurality of combined data frames using time division multiplexing and transmitting the first combined data frames over a single optical channel.
    Type: Grant
    Filed: March 19, 2008
    Date of Patent: November 15, 2011
    Assignee: Futurewei Technologies, Inc.
    Inventor: Frank J. Effenberger
  • Patent number: 8050561
    Abstract: A passive optical network (PON) system comprising a plurality of optical network units (ONUs) having one downstream receiver and one upstream transmitter, an optical line terminal (OLT) having a downstream transmitter and a plurality of upstream receivers, wherein each upstream receiver is associated with a subset of the ONUs, and an optical distribution network (ODN) that connects the OLT to the ONUs is disclosed. An OLT for a PON, comprising a downstream transmitter, and a plurality of upstream receivers, wherein a downstream transmitter bandwidth is greater than each upstream receiver bandwidth is also disclosed. A network component comprising a processor configured to implement a method comprising determining a downstream bandwidth and an upstream bandwidth for a PON, and increasing a number of upstream channels per downstream channel for the PON when asymmetry between the downstream bandwidth and the upstream bandwidth is greater than a threshold amount is also disclosed.
    Type: Grant
    Filed: February 21, 2007
    Date of Patent: November 1, 2011
    Assignee: Futurewei Technologies, Inc.
    Inventor: Frank J. Effenberger
  • Patent number: 8050562
    Abstract: Provided is an apparatus for implementing an electro-optical cable distribution network in which a coaxial cable is replaced with an optical cable in order to provide a service integrating broadcast data and communication data by solving a frequency constraint problem in a cable television (CATV) network employing a conventional hybrid-fiber coaxial (HFC) network architecture. The apparatus includes an optical network unit (ONU) which converts a downstream signal received from a system operator (SO) into an optical signal and transmits the optical signal to an optical cable; and an optical cable modem which receives the optical downstream signal from the ONU and converts the received signal into an electrical signal. In addition, the ONU and the optical cable modem control signal quality of an optical path.
    Type: Grant
    Filed: December 7, 2007
    Date of Patent: November 1, 2011
    Assignee: Electronics and Telecommunications Research Institute
    Inventors: Heyung Sub Lee, Jae Hoon Yu, Dong-Beom Shin, Hong Soon Nam, Young Sun Kim
  • Patent number: 8050560
    Abstract: A distributed resources sharing method using weighting factors of sub-domains in an optical network includes connecting working paths to an optical network according to a request of a subscriber, and calculating weighting factors for measurement of concentration of the sub-domains including the working paths by using information on connected working paths. The method also includes setting up the backup paths by using the weighting factors, and allocating resources in response to connection request at the time of setting up the backup path and sharing the allocated resources. With this method, it is possible to prevent a waste of idle resources caused from concentration of allocated resources. In addition, since the information of the idle resources in the network can be sensed at the time of selecting the backup paths by using a weight factor, the shared resources can be distributed, thereby maximizing efficiency of the resources.
    Type: Grant
    Filed: October 30, 2007
    Date of Patent: November 1, 2011
    Assignee: Electronics & Telecommunications Research Institute
    Inventors: Hyeon Park, Byung Ho Yae
  • Patent number: 8041215
    Abstract: A method, a computer readable medium, and a system for discovering an Optical Network Terminal (ONT) in a Dense Wave Division Multiplex (DWDM) hybrid Passive Optical Network (PON) Line Terminal (LT), comprises implementing, by an Optical Line Termination (OLT), a ranging procedure on at least one downstream link, wherein the OLT is communicably coupled to the ONT, discovering at least one new ONT, by the OLT, on the at least one downstream link based on the ranging procedure, discovering an unranged ONT, by the OLT, during the ranging procedure, and determining, by the OLT, that the unranged ONT resides on the at least one downstream link.
    Type: Grant
    Filed: July 13, 2007
    Date of Patent: October 18, 2011
    Assignee: Alcatel Lucent
    Inventors: Joseph Lee Smith, David Eckard
  • Patent number: 8041219
    Abstract: A method of optical communication includes generating an amplified optical signal from at least a portion of a first optical signal having a first carrier wavelength, ?1. The amplified optical signal is applied to Brillouin media to stimulate generation of a Brillouin effect signal at a wavelength ?2. The Brillouin effect signal is modulated to produce a second optical signal having a second carrier wavelength, ?2. In one embodiment, the first optical signal is a downstream optical signal and the second optical signal is an upstream optical signal of a passive optical network.
    Type: Grant
    Filed: January 31, 2008
    Date of Patent: October 18, 2011
    Assignee: Tellabs Operations, Inc.
    Inventors: José Antonio Lázaro Villa, Josep Joan Prat Gomá, Mireia Esther Omella Cancer
  • Patent number: 8041216
    Abstract: In a passive optical network, an upstream transmission rate from an ONT to an OLT can be optimized by matching a transmission scheme for a channel to the upstream transmission characteristics of the channel. An FEC coding can be made channel dependent so that channels with low error rates can use minimal protection, and therefore minimal overhead, while channels with high input bit error rates can use the level of FEC coding required to produce a desired output bit error rate.
    Type: Grant
    Filed: June 10, 2009
    Date of Patent: October 18, 2011
    Assignee: Alcatel Lucent
    Inventor: Adriaan J. de Lind van Wijngaarden
  • Patent number: 8036532
    Abstract: In a PON system by WDM, IP broadcast can be received without oppressing a band used by a user for Internet communication. An OLT provides a first wavelength received in common by respective ONUs and plural second wavelengths by which the OLT and the respective ONUs perform communication individually. With respect to signals in the downstream direction, each of the OLTs includes a transmitter to transmit the first wavelength and plural transmitters to transmit the second wavelengths used for the individual communication with the respective ONUs. Each of the ONUs includes a receiver to receive the first wavelength and a receiver to receive the second wavelength used in the ONU itself. The OLT transmits data of the IP broadcast by the first wavelength and transmits individual data of each of the ONUs by the second wavelength corresponding to the ONU.
    Type: Grant
    Filed: May 14, 2010
    Date of Patent: October 11, 2011
    Assignee: Hitachi, Ltd.
    Inventors: Kenichi Sakamoto, Tohru Kazawa
  • Patent number: 8036531
    Abstract: A optical switch and switching system is provided for effecting a switchover from a first optical fiber to a second optical fiber includes a first, large scale switching component and a second, small scale switching component. The first, large scale switching component is configured to establish a cross connect between the second optical fiber and the second, small scale switching component. The second, small scale switching component may then be configured to select the cross connect following establishment of the cross connect, thereby ensuring rapid switchover from the first fiber to the second fiber, regardless of the speed of the first large scale switching component.
    Type: Grant
    Filed: December 14, 2006
    Date of Patent: October 11, 2011
    Assignee: Verizon Patent and Licensing Inc.
    Inventors: Tiejun J. Xia, Glenn A. Wellbrock
  • Patent number: 8027586
    Abstract: A passive optical network (PON) system which enables plural types of ONUs having different signal transmission speeds to be connected to one OLT. An optical line terminating apparatus (OLT) connected to plural types of ONUs having different signal transmission speeds through an optical distribution network includes an optical transmitter-receiver connected to the optical distribution network, a transmission/reception line interface connected to a wide area network, a downstream frame processing section for converting a packet received by the transmission/reception line interface from the wide area network into a downstream frame containing identification information on a destination ONU in a header, and a downstream transmission controller for modulating the downstream frame at a speed corresponding to a signal transmission speed of the destination ONU and outputting the modulated frame to an electrical/optical converter connected to the optical transmitter-receiver.
    Type: Grant
    Filed: February 21, 2008
    Date of Patent: September 27, 2011
    Assignee: Hitachi, Ltd.
    Inventors: Hiroki Ikeda, Masahiko Mizutani, Toshiki Sugawara, Shinobu Gohara
  • Patent number: 8023823
    Abstract: In accordance with the teachings of the present invention, a system and method for transmitting upstream traffic in an optical network is provided. In a particular embodiment, the method includes transmitting upstream traffic at a first wavelength from a first downstream terminal to a distribution node and transmitting upstream traffic at a second wavelength from a second downstream terminal to the distribution node. The method also includes combining the upstream traffic in the first wavelength and the upstream traffic in the second wavelength at a coupler in the distribution node without multiplexing the upstream traffic in the first wavelength and the upstream traffic in the second wavelength. The method also includes forwarding the combined traffic from the distribution node to a single upstream terminal.
    Type: Grant
    Filed: June 27, 2006
    Date of Patent: September 20, 2011
    Assignee: Fujitsu Limited
    Inventor: Martin Bouda
  • Patent number: 8023820
    Abstract: Systems, apparatus, methods and computer program products are provided for downloading a whitelist onto a passive optical network including a passive optical network and a management interface communicatively coupled to the passive optical network and configured to provision the whitelist. An optical line terminal also on the passive optical network includes a passive optical network card operable to broadcast the whitelist to optical network terminals which are configured to receive and enforce the whitelist.
    Type: Grant
    Filed: January 14, 2008
    Date of Patent: September 20, 2011
    Assignee: Tellabs Vienna, Inc.
    Inventors: Marc R. Bernard, Edward J. Szczebak
  • Patent number: 8019220
    Abstract: The present invention provides a PON system including a plurality of PONs (passive optical network), a plurality of house devices set in an end user's house, and a station side device including a plurality of PON interface sections connected to the house devices via the plurality of PONs, and a concentrating/distributing section for accommodating the plurality of PONs and concentrating and distributing signals via the plurality of PON interface sections; wherein the station side device has N (N is a positive integer) optical switch modules, each of which is connected to a PON interface section for current use among the plurality of PONs; and realizes 1:N redundant of the PONs by cascading the N optical switch modules.
    Type: Grant
    Filed: June 7, 2007
    Date of Patent: September 13, 2011
    Assignee: NEC Corporation
    Inventor: Hirokazu Ozaki
  • Patent number: 8019221
    Abstract: Systems and methods which facilitate broadband transmission of signals using a delivery point tuning technique to provide a extended frequency passive optical network (EF-PON) are shown. Embodiments provide an extended frequency optical transition node (EF-OTN) at each of a plurality of delivery points to provide a frequency translation interface between equipment disposed at the delivery point locations and a network utilizing transmission bandwidth which is incompatible with that equipment. The foregoing frequency conversion is preferably transparent to the equipment receiving the network transmissions. Embodiments utilize a single wideband tuner for providing frequency conversion with respect to a plurality of equipment disposed a delivery point.
    Type: Grant
    Filed: August 2, 2007
    Date of Patent: September 13, 2011
    Assignee: Zoran Corporation
    Inventor: Gregory J. Zancewicz
  • Patent number: 8014673
    Abstract: A management method of an optical fiber network system is disclosed. The optical fiber network system includes at least one user apparatus and an optical network unit (ONU), and the ONU is connected with the user apparatus. The management method includes the steps of: adopting at least one information string, which is set by an ONU management and control interface (OMCI), by the optical network unit; packing the information string into a management packet; and transmitting the management packet to the user apparatus by the optical network unit according to an Ethernet protocol.
    Type: Grant
    Filed: October 18, 2007
    Date of Patent: September 6, 2011
    Assignee: Accton Technology Corporation
    Inventor: Chuan-Wei Liu
  • Patent number: 8005361
    Abstract: While continuously providing a service in an existing optical communication system, a service at another communication speed is realized at low cost. For this reason, a station-side optical network terminal apparatus is configured so that to one light-emitting unit connected are a first processing unit that performs a process to output an optical signal at one communication speed by the light-emitting unit and a second processing unit that performs a process to output an optical signal at another communication speed by the light-emitting unit.
    Type: Grant
    Filed: August 28, 2007
    Date of Patent: August 23, 2011
    Assignee: NEC Corporation
    Inventors: Hiroshi Nakaishi, Tatsuya Kubota
  • Patent number: 7991291
    Abstract: Low-cost FP lasers can be implemented in the upstream links of a WDM PON system by configuring them for single-mode operation. In a typical embodiment, an FP laser at a subscriber unit is injection seeded with CW seed light from a DFB laser or an ASE source at a central office to enable single-mode operation of the FP laser. The FP laser is directly modulated and the resulting optical data signal is transmitted upstream to the central office. At the central office, an optical spectrum reshaper/bandpass optical filter is positioned in front of an optical receiver to enhance the extinction ratio of the optical data signal and generate a vestigial sideband. A wavelength locker can also be implemented at the central office to stabilize the wavelength of the master DFB laser and the injection-seeded FP laser.
    Type: Grant
    Filed: February 8, 2008
    Date of Patent: August 2, 2011
    Assignee: Finisar Corporation
    Inventors: Yasuhiro Matsui, Kevin McCallion
  • Patent number: 7978976
    Abstract: An optical data transmission system having a hub, an optical router, and a plurality of optically pumped sources at a curb location, and a plurality of optical network units (ONUs). The ONUs generate and transmit respective data modulated pumping light to the curb location where it is received by the optically pumped sources, which convert it into the wavelength channels having predefined wavelength ranges assigned to respective ONUs. The optical router routes the wavelength channels for transmission to the hub.
    Type: Grant
    Filed: July 18, 2003
    Date of Patent: July 12, 2011
    Assignee: Schofield Technologies LLC
    Inventors: Olli-Pekka Pohjola, Ari Tervonen, Harri T. Jarvinen, Markku Oksanen
  • Patent number: 7978977
    Abstract: The present invention is directed towards monitoring and adjusting a power level of reverse subcarrier signals at an input of an optical node as opposed to at an input of a CMTS blade. Advantageously, reverse subcarrier signals are digitally transmitted throughout the optical link thereby avoiding the use of attenuators in the optical link. Therefore, any attenuation of the power level of the reverse subcarrier signals is caused by an RF feeder portion of the communications system. The CMTS blade then detects the power level of the reverse subcarrier signal that is equivalent to the power level at the input of an optical node and sends a control signal to CPE adjusting the transmitter power level without affecting the optical node dynamic range.
    Type: Grant
    Filed: June 27, 2006
    Date of Patent: July 12, 2011
    Inventor: Lamar E. West, Jr.
  • Patent number: 7962037
    Abstract: Provided is an ONU that suppresses transmission of a useless multicast control message to a PON section and enables a communication bandwidth of the PON section to be effectively used. The ONU of the PON system has a multicast group management table that shows a correspondence between a multicast group identifier and an address of a user terminal participating in a multicast group. When the ONU receives a request message of participation in the multicast group from the user terminal, the ONU registers the correspondence between the multicast group identifier indicated by the received message and the user terminal address. A new received message is deleted without being sent to the OLT if another user terminal address is registered already, along with a correspondence with the same multicast group identifier, in the multicast group management table.
    Type: Grant
    Filed: November 19, 2009
    Date of Patent: June 14, 2011
    Assignee: Hitachi, Ltd.
    Inventors: Masahiko Mizutani, Takeshi Shibata, Tohru Kazawa, Yoshihiro Ashi, Masanobu Kobayashi, Masayuki Takase
  • Patent number: 7957647
    Abstract: In a WDM-PON system wherein a plurality of ONUs transfer signals by sharing wavelengths, one wavelength dedicated to a ranging procedure is set, and the ranging is performed with only the dedicated wavelength, so as to measure reciprocating delay times. At the other wavelengths, transmission signals from a plurality of ONUs are transferred in time division multiplexing based on the obtained reciprocating delay times. An OLT includes a burst receiver circuit for only the wavelength dedicated to the ranging, and subsequently to the ranging, the OLT adjusts transmission amplitudes and transmission phases for the ONUs, so as to equalize received amplitudes and received phases in the OLT. For this purpose, the OLT includes means for measuring the amplitudes and phases of received signals, as the burst receiver circuit, and it includes a table for managing the received amplitudes and received phases of the respective ONUs.
    Type: Grant
    Filed: April 15, 2008
    Date of Patent: June 7, 2011
    Assignee: Hitachi, Ltd.
    Inventors: Tohru Kazawa, Yusuke Yajima, Masaki Oohira
  • Patent number: 7957645
    Abstract: A number of fiber optic interconnection systems and apparatuses, optical network nodes, and methods are disclosed. One fiber optic interconnection system embodiment includes a first interconnectivity component for receiving and sending one or more signals between at least a first optical network node and a second optical network node, a second interconnectivity component for receiving and sending one or more signals between at least the first optical network node and the second optical network node, a distribution component that encodes an information signal onto a number of optical signals having different wavelength ranges, and a directional component for directing the number of optical signals having different wavelength ranges through one of the first or second interconnectivity components.
    Type: Grant
    Filed: August 20, 2007
    Date of Patent: June 7, 2011
    Assignee: Lockheed Martin Corporation
    Inventors: Rick C. Stevens, Brian L. Uhlhorn, Roger J. Karnopp
  • Patent number: 7953325
    Abstract: An optical fiber network can include an outdoor laser transceiver node that can be positioned in close proximity to the subscribers of an optical fiber network. The outdoor laser transceiver node does not require active cooling and heating devices that control the temperature surrounding the laser transceiver node. The laser transceiver node can adjust a subscriber's bandwidth on a subscription basis or on an as-needed basis. The laser transceiver node can also offer data bandwidth to the subscriber in preassigned increments. Additionally, the laser transceiver node lends itself to efficient upgrading that can be performed entirely on the network side. The laser transceiver node can also provide high speed symmetrical data transmission. Further, the laser transceiver node can utilize off-the-shelf hardware to generate optical signals such as Fabry-Perot (F-P) laser transmitters, distributed feed back lasers (DFB), or vertical cavity surface emitting lasers (VCSELs).
    Type: Grant
    Filed: August 26, 2009
    Date of Patent: May 31, 2011
    Assignee: Enablence USA FTTX Networks, Inc.
    Inventors: James O. Farmer, John J. Kenny, Patrick W. Quinn, Thomas A. Tighe, Paul F. Whittlesey, Emmanuel A. Vella
  • Patent number: 7953324
    Abstract: System and method for data synchronization in Passive Optical Networks. According to an embodiment, the present invention provides a method for providing upstream data synchronization in an optical communication network. The method includes sending data from an Optical Network Unit. The data includes a first data frame, which includes a header sequence, a synchronization segment, and a data segment. The synchronization segment includes 66 bits, which includes a first number of bits having nonzero values and a second number of bits having a value of zero. The first number is different from the second number. The method further includes receiving at least the first data frame by an Optical Line Terminal. The method also includes processing the first data frame. The method additionally includes selecting a first segment of the first data frame, the first segment including 66 bits.
    Type: Grant
    Filed: November 13, 2007
    Date of Patent: May 31, 2011
    Assignee: Huawei Technologies Co., Ltd.
    Inventors: Raymond W. K. Leung, Dongyu Geng, Dongning Feng, Frank Effenberger, Sergio Benedetto, Guido Montorsi
  • Patent number: 7945163
    Abstract: To achieve a station-side apparatus of a wavelength multiplexing PON system, which is capable of saving the wavelength resource through automatically carrying out allotment of the wavelength and the network address to reduce the complicated work for the setting, and through dynamically allotting the wavelength without fixing it in advance. It is a station-side apparatus (OLT) of a wavelength multiplexing PON system that comprises a plurality of in-home apparatuses (ONUs). The station-side apparatus is connected to the in-home apparatuses via transmission paths including an optical multiplexing distributor, and executes allotment of the wavelength in response to wavelength allotment requests from the in-home apparatuses. The station-side apparatus comprises a wavelength/network address allotting device that is provided with a DHCP server in advance, which dynamically allots wavelength and network address to the in-home apparatus in response to the wavelength allotment request from the in-home apparatus.
    Type: Grant
    Filed: March 29, 2007
    Date of Patent: May 17, 2011
    Assignee: NEC Corporation
    Inventor: Hirokazu Ozaki
  • Publication number: 20110097086
    Abstract: Embodiments of the present invention are directed to optical broadcast systems (100,140,160,180). The nodes of the system can be any combination of cores, caches, input/output devices, and memory, or any other information processing, transmitting, or storing device. The optical broadcast system includes an optical broadcast bus (142,162,182). Any node of the system in optical communication with the broadcast bus can broadcast information in optical signals to all other nodes in optical communication with the broadcast bus.
    Type: Application
    Filed: June 17, 2008
    Publication date: April 28, 2011
    Inventors: Nathan L. Binkert, Dana M. Vantrease, Moray Mclaren, Marco Fiorentino