Time Division Patents (Class 398/98)
  • Patent number: 8824888
    Abstract: The present invention relates to a method for negotiating link capability information. The method includes: After a higher order optical channel data unit (ODU) link is established, a second node receives first higher order ODU link capability information supported by a first node at one end of the link, where the second node is located at the other end of the link; determines link capability information according to the first higher order ODU link capability information and second higher order ODU link capability information that is supported by the second node; and sends the link capability information to the first node; or sends the second higher order ODU link capability information to the first node, so that the first node determines the link capability information according to the first higher order ODU link capability information and the second higher order ODU link capability information.
    Type: Grant
    Filed: February 24, 2012
    Date of Patent: September 2, 2014
    Assignee: Huawei Technologies Co., Ltd.
    Inventors: Yi Lin, Xiaobing Zi, Qiuyou Wu
  • Patent number: 8824894
    Abstract: When an ONU accommodating range is enlarged, and ONUs shorter and ONUs longer in a communication path to an OLT are accommodated in a PON at the same time, there is a need to change a light intensity at the time of transmitting a downstream signal in order that both of the ONUs receive a downstream signal from the OLT. When a near-end ONU receives a signal having a light intensity necessary to communicate between the OLT and a far-end ONU, there arises such a problem that the light intensity is as high as an ONU receiver fails. In order to eliminate the ONU failure of the above problem, prior to transmission of the downstream signal, a downstream signal transmission schedule (downstream light intensity map) is notified to all of the ONUs. An optical transceiver of the OLT has a function of adjusting an output light intensity, and adjusts the light intensity to values receivable by the individual ONUs when the signal arrives at the respective ONUs according to route distances to the respective ONUs.
    Type: Grant
    Filed: August 30, 2011
    Date of Patent: September 2, 2014
    Assignee: Hitachi, Ltd.
    Inventors: Masao Niibe, Masahiko Mizutani
  • Patent number: 8824893
    Abstract: Provided is an optical network system and optical network unit (ONU) structure enabling a passive optical access network having a meshed structure with at least two central nodes and plurality of ONUs. One embodiment employs a partially or fully meshed structure of optical fibers between customer locations and multiple optical line terminal (OLT) locations creating a passive optical access network. The ONUs can communicate with a neighboring OLT or ONU using a symmetrical or asymmetrical TDM scheme, and convert between the different TDM schemes. For this purpose, the ONU structure includes two transceiver units, one connected to the western network port and the other to the eastern. The ONU can establish communication between either network port and a further ONU or an OLT, with the ONU controller adapted for passing through data, and converting TDM schemes.
    Type: Grant
    Filed: November 19, 2012
    Date of Patent: September 2, 2014
    Assignee: ADVA Optical Networking SE
    Inventor: Henning Hinderthür
  • Patent number: 8817589
    Abstract: Methods and apparatus for line coding in a communications network are described. According to one embodiment of the invention, downstream communications traffic bits are received and mapped into downstream bit positions of a transmission structure. A pre-selected bit in each upstream bit positions of the transmission structure is provided to form a downstream transmission structure. A downstream optical signal carrying the downstream transmission structure is generated for transmission. Upstream communications traffic bits are also received and mapped into the upstream bit positions of the transmission structure to form an upstream transmission structure. An upstream optical signal carrying the upstream transmission structure is generated for transmission.
    Type: Grant
    Filed: September 16, 2011
    Date of Patent: August 26, 2014
    Assignee: Telefonaktiebolaget L M Ericsson (Publ)
    Inventors: Fabio Cavaliere, Stefan Dahlfort, Luca Giorgi
  • Patent number: 8787763
    Abstract: Embodiments of the present invention provide a repeater, including a local unit and a remote unit. The local unit includes a base station interface unit, multiple local basic units and a controller. The remote unit includes multiple remote basic units. The controller is configured to generate, according to a down-tilt angle and/or azimuth angle of a downlink signal instructed by a control instruction, a downlink signal phase for each remote basic unit. The multiple local basic units each are configured to perform, according to the downlink signal phase generated by the controller for a corresponding remote basic unit, phase adjustment on the downlink signal sent by the base station interface unit. The multiple remote basic units each are configured to receive the downlink signal sent by a corresponding local basic unit and to send the downlink signal.
    Type: Grant
    Filed: April 25, 2013
    Date of Patent: July 22, 2014
    Assignee: Huawei Technologies Co., Ltd.
    Inventor: Lanping Gong
  • Publication number: 20140199067
    Abstract: A method, comprises measuring, by circuitry of a computer system, a first bandwidth of data traffic of a transport path over a time period, the transport path passing through a plurality of nodes and conforming to a protocol using a number of time slots to allocate a second bandwidth to the transport path. The method further includes passing a signal, from the computer system to at least one of the nodes of the transport path, the signal including at least one instruction that when executed by circuitry of the at least one node causes a change to the number of time slots allocated to the transport path.
    Type: Application
    Filed: June 28, 2013
    Publication date: July 17, 2014
    Inventors: Satyajeet Ahuja, Ping Pan, Rajan Rao, Biao Lu
  • Patent number: 8774623
    Abstract: Disclosed herein is a Passive Optical Network (PON) system and method for detecting a fault in an Optical Network terminal (ONT). The PON system for detecting a fault in an ONT includes a plurality of ONTs for outputting optical signals in time slots allocated thereto in a time division access control manner and having at least one virtual ONT. An Optical Line Terminal (OLT) receives the optical signals output from the plurality of ONTs in the time division access control manner, and then detects a faulty ONT. According to the present invention, a faulty ONT that continuously outputs signals can be detected and action can be rapidly taken against system faults when a virtual ONT is formed in a plurality of ONTs connected to an OLT and then an optical signal in the section of the virtual ONT is detected, thus providing a reliable service.
    Type: Grant
    Filed: June 28, 2012
    Date of Patent: July 8, 2014
    Assignee: Ubiquoss Inc.
    Inventors: Shin Hak Yang, Young Seok Yang, Jae Kug Kim
  • Publication number: 20140178076
    Abstract: An apparatus comprising a receiver configured to receive a plurality of transmission requests from a plurality of end nodes via an optical network and an electrical network, a processor coupled to the receiver and configured to dynamically allocate optical transmission time slots to the end nodes according to measured RTTs of the end nodes, and a transmitter coupled to the processor and configured to transmit the allocated transmission time slots to the end nodes. Also disclosed is a method performed by an OLT comprising receiving a plurality of transmission requests from a plurality of network units via a PON and an electrical network, and allocating optical transmission time slots to the network units dynamically according to measured RTTs of the network units.
    Type: Application
    Filed: December 17, 2013
    Publication date: June 26, 2014
    Applicant: Futurewei Technologies, Inc.
    Inventors: Liming Fang, Jim Chen, Li Zhang
  • Patent number: 8755688
    Abstract: An optical fiber transmission distribution assembly, wherein the assembly comprises at least a first splitter having a first split ratio of 1:x (where x is an integer) connected to optical drop cables leading to subscribers, and at least a second splitter having a second split ratio of 1:y (where y is an integer and is different from x), and transfer means whereby an optical drop cable connected to the first splitter can be transferred to receive split optical signals from the second splitter, thereby enabling the signal in the transferred drop cable to be further split by addition of a third splitter at a ratio of 1:p (where p is an integer), to provide p subscriber connection points each having a 1:p*y split ratio at the subscriber end of the transferred drop cable.
    Type: Grant
    Filed: July 17, 2009
    Date of Patent: June 17, 2014
    Assignee: Tyco Electronics Raychem BVBA
    Inventors: Ludwig Vleugels, Daniel Francois Daems, Danny Van Goidsenhoven
  • Patent number: 8755321
    Abstract: The present invention discloses a method for transmitting multimedia broadcast multicast services, comprising the following steps: a Time Division Duplex system divides a time slot for bearing multimedia broadcast multicast services into code channels; each multimedia broadcast multicast service to be transmitted is borne on a corresponding divided code channel, and is transmitted to a user equipment based on the single frequency network mode of the multimedia broadcast multicast service. The present invention also discloses a method for receiving multimedia broadcast multicast services, and apparatus for transmitting and receiving multimedia broadcast multicast services, such that time slot resources for bearing multimedia broadcast multicast services are utilized more sufficiently.
    Type: Grant
    Filed: July 18, 2008
    Date of Patent: June 17, 2014
    Assignee: China Academy of Telecommunications Technology
    Inventors: Xuelong Wang, Yu Ding
  • Patent number: 8755695
    Abstract: A burst transmission method and a receiver resetting method and apparatus in a Passive Optical Network (PON) are provided. A burst receiver resetting method in a PON includes: receiving a preamble sequence and synchronizing data; after synchronizing the data, continuing to receive the data, and matching a Burst Terminator (BT); and resetting a receiver after successfully matching the BT. Meanwhile, an apparatus for implementing the method and a corresponding burst data transmission method are provided. By using the burst receiver resetting method and apparatus in the PON and the corresponding burst transmission method at an Optical Network Unit (ONU) burst transmission end, a Reach Extender (RE) does not need to unpack upstream burst bandwidth allocation information carried in downstream data.
    Type: Grant
    Filed: September 25, 2013
    Date of Patent: June 17, 2014
    Assignee: Huawei Technologies Co., Ltd.
    Inventors: Jing Li, Dongning Feng, Dongyu Geng, Frank Effenberger
  • Publication number: 20140161463
    Abstract: The present invention provides a method, apparatus and system for transmitting and receiving a client signal. A client signal is mapped to a low-order ODU via a GFP scheme, wherein the low-order ODU is sized to M equal sized timeslots of a high-order OPUk, wherein the high-order OPUk is divided into N equal sized timeslots, wherein M is any one of a group from 1 to N; wherein if k=2, then N=8, if k=3, then N=32 and if k=4, then N=80. The low-order ODU with the client signal is mapped to M equal sized timeslots of the high-order OPUk via a GMP scheme; and an OTU with the high-order OPUk and overheads is formed, and then the OTU is transmitted.
    Type: Application
    Filed: February 13, 2014
    Publication date: June 12, 2014
    Applicant: Huawei Technologies Co., Ltd.
    Inventors: Limin DONG, Qiuyou WU, Qiwen ZHONG, Zhiying YAO, Maarten VISSERS
  • Publication number: 20140153926
    Abstract: Techniques for converting signal and idler photons generated by a nonlinear optical system into a deterministic stream of single photons including receiving a heralded, nondeterministic source of signal and idler photons from the nonlinear optical process, separating one or more received signal photons from one or more received temporally corresponding idler photons, determining whether at least one of the one or more signal photons should be variably delayed, and if so, determining a delay length, and variably delaying the emission of one of the one or more signal photons, if any, by the determined delay length.
    Type: Application
    Filed: January 7, 2014
    Publication date: June 5, 2014
    Inventors: Jacob Mower, Dirk R. Englund
  • Patent number: 8744268
    Abstract: A GPON module comprises a housing and a circuit board disposed in the housing. The circuit board further includes ground lines that substantially isolate regions of the circuit board, an electro-optical interface for converting an inbound optical signal to an electrical signal and processing circuitry that is arranged to provide an electrical RF signal to an RF interface. The RF interface comprises a three-pin RF connector exposed from the housing, wherein the RF connector is coupled directly to the circuit board, and two of the three pins are coupled to ground.
    Type: Grant
    Filed: March 10, 2008
    Date of Patent: June 3, 2014
    Assignee: Emcore Corporation
    Inventors: Xiaoming Lou, Genzao Zhang, Eric Hufstedler, Leonel Gomez, Eva Peral
  • Patent number: 8744265
    Abstract: A passive optical network (PON) component comprising a processor coupled to a plurality of receivers, the processor configured to monitor a plurality of drifting laser wavelengths and cause the drifting laser wavelengths to be tuned to a plurality of pass-bands. Also disclosed is an optical network unit (ONU) comprising a receiver, a transmitter coupled to the receiver, and a partially-tunable laser coupled to the transmitter and having a drifting laser wavelength, wherein the drifting laser wavelength is periodically tuned to one of a plurality of pass-bands. Included is a method comprising monitoring a plurality of drifting laser wavelengths associated with a plurality of pass-bands, and reconfiguring a plurality of time division multiple access (TDMA) timeslots when one of the drifting laser wavelengths migrates from one pass-band to another pass-band.
    Type: Grant
    Filed: April 27, 2007
    Date of Patent: June 3, 2014
    Assignee: Futurewei Technologies, Inc.
    Inventor: Frank J. Effenberger
  • Patent number: 8731404
    Abstract: An optical transmission system is provided. The optical transmission system includes a user side optical repeater device (ORD), a central office side ORD, and wavelength multiplexing and wavelength de-multiplexing functions (MUX/DEMUX). The user side optical repeater device (ORD) is to be connected with a user side optical network unit (ONU), transmits data in two ways, and is used for wavelength division multiplexing (WDM). The central office side ORD is to be connected with a central office side optical line terminal (OLT), transmits data in two ways, and is used for WDM. The wavelength multiplexing and a wavelength de-multiplexing functions (MUX/DEMUX), are used for relaying between the user side ORD and the central office side ORD.
    Type: Grant
    Filed: November 30, 2012
    Date of Patent: May 20, 2014
    Assignee: Furukawa Electric Co., Ltd.
    Inventor: Masayuki Miura
  • Publication number: 20140133859
    Abstract: A method of allocating upstream bandwidth on a network comprising mapping an integer portion of a value obtained from a grant start time into a symbol number of a data frame on a coaxial segment of the network, wherein the value comprises the grant start time in units of a length of a data frame in the coaxial segment of a network, and wherein the length of the data frame comprises a preselected number of units of time defined in an optical segment of a network; mapping a fractional portion of the value obtained from the grant start time into a subcarrier number of the data frame; and mapping a grant length into a number subcarriers of the data frame.
    Type: Application
    Filed: December 28, 2012
    Publication date: May 15, 2014
    Applicant: FUTUREWEI TECHNOLOGIES, INC.
    Inventors: Liming Fang, Jim Chen, Li Zhang
  • Patent number: 8725002
    Abstract: The present invention discloses a method and system for accurate time transfer in PON. An Optical Line Terminal (OLT) ranges Optical Network Units (ONUs) and obtains ranging information, then, triggered by the periodic Pulse per n Second (PPnS), generates a PPnS timestamp based on the local reference counter and the Time of Day (TOD) above second; OLT transmits the ranging information, the periodic PPnS timestamp and TOD to ONUs; ONUs predicts the time of the next second according to said periodic PPnS timestamp, TOD and ranging information, and outputs the corresponding PPnS. The invention is characterized by the combination of the features of PON point to multi-point and PON ranging into its time transfer method, the high accuracy of time transfer, and the low hardware costs for OLT and ONU, as well as the extremely small bandwidth occupancy.
    Type: Grant
    Filed: September 30, 2009
    Date of Patent: May 13, 2014
    Assignee: ZTE Corporation
    Inventors: Jianxin Lu, Jingxuan Wang
  • Publication number: 20140119733
    Abstract: There is provided a frame converter that writes input data included in an input frame to a buffer to accumulate the input data and outputs data read from the buffer as output data included in an output frame, the frame converter includes a setting unit configured to set a time interval from start of resizing of data rate of the input data to start of resizing of data rate of the output data when resizing of an accumulation amount in the buffer is performed in which data rates of the input data and the output data vary, and an adjustment unit configured to adjust to approximate the data rate of the output data to the data rate of the input data after the time interval has elapsed since the start of resizing of data rate of the input data.
    Type: Application
    Filed: September 10, 2013
    Publication date: May 1, 2014
    Applicant: FUJITSU LIMITED
    Inventors: Makoto Shimizu, Shota Shinohara
  • Patent number: 8712240
    Abstract: The embodiments of the present invention relate to communications technology, and disclose an optical power measurement method, an Optical Line Terminal (OLT), and an Optical Network Unit (ONU). The method includes: generating a Physical Layer Operation Administration Maintenance (PLOAM) message that includes an identifier of at least one ONU to be measured and information about a time bucket that is allocated to the ONU to be measured and is used for sending upstream optical signals; sending the PLOAM message to the multiple ONUs; receiving the upstream optical signals that are sent, in the allocated time bucket, by the ONU to be measured; and detecting the received upstream optical signals, and determining the optical power of the upstream optical signals. The present invention avoid waste of bandwidth caused in the prior art when the DBA is required to allocate bandwidth to the ONU to be measured for the purpose of detecting the optical power.
    Type: Grant
    Filed: September 30, 2011
    Date of Patent: April 29, 2014
    Assignee: Huawei Technologies Co., Ltd.
    Inventors: Ping Ding, Yinghua Dong, Xuanqin Liang, Guangdong Wu
  • Patent number: 8705965
    Abstract: There is a need to recover an ONU from a sleep state for communication with the PON before a specified sleep cancel time in a short period of time without degrading the band use efficiency. An OLT manages an electric state of each ONU connected to a PON. When at least one ONU is in sleep mode, the OLT transmits a grant to allocate a band for a sleep cancel report to the ONU. When the sleep-mode ONU requires communication, the ONU transmits the sleep cancel report to the OLT using the band for the sleep cancel report. When receiving the sleep cancel report, the OLT changes the managed ONU to a normal state and resumes the communication with the PON.
    Type: Grant
    Filed: January 10, 2011
    Date of Patent: April 22, 2014
    Assignee: Hitachi, Ltd.
    Inventors: Jun Sugawa, Hiroki Ikeda, Tohru Kazawa
  • Publication number: 20140105604
    Abstract: An optical management node comprising a memory comprising instructions, a processor coupled to the memory and configured execute the instructions, wherein executing the instructions causes the processor to schedule data transmissions across an electrical network between a plurality of user terminals and an optoelectrical interface by using time division multiplexing or time division multiple access based on optimization of crosstalk performance of electrical lines of the electrical network, and a transmitter coupled to the processor and configured to transmit schedule information to the optoelectrical interface via an optical network. Also disclosed is a method implemented in a management node comprising scheduling data transmissions with a plurality of user terminals across a Digital Subscriber Line (DSL) network using time division scheduling based on optimization of crosstalk performance of DSL lines of the DSL network, and transmitting schedule information to the user terminals via an optical network.
    Type: Application
    Filed: October 14, 2013
    Publication date: April 17, 2014
    Applicant: Futurewei Technologies, Inc.
    Inventors: Yuanqiu Luo, Frank Effenberger
  • Patent number: 8699885
    Abstract: There are disclosed techniques for power control in an Optical Network Unit (ONU) of a Passive Optical Network (PON). In one embodiment, the supply of power to an optical transmitter is controlled in accordance with information defining a plurality of transmission windows during which data can be transmitted from the ONU, in order to achieve the following: (1) to provide power to the optical transmitter beginning at a predetermined time in advance of a transmission window to ensure a laser in the optical transmitter is ready to begin transmitting the data at the start of the transmission window; and (2) to refrain from providing full power to the optical transmitter between transmission windows when the duration of time between the transmission windows is greater than a predetermined length.
    Type: Grant
    Filed: May 12, 2011
    Date of Patent: April 15, 2014
    Assignee: Cortina Systems, Inc.
    Inventors: Dongsheng Zhang, Eugene W. Lee
  • Publication number: 20140079402
    Abstract: The present invention and its embodiments are made to provide for dynamic hitless resizing in optical transport network without any identification of matching time slots by the Network Management System (NMS) or any control plane signaling including Generalised Multi Protocol Label Switching (GMPLS). An aspect of the invention provides for a method of hitless ODUflex connection resizing in an optical transport network by incrementing or decrementing the ODUflex connection between the nodes, based on an indication command given to a source node for bandwidth increase or decrease, by identifying and matching at least one time slot through Link Connection Resizing (LCR) protocol message exchanges. Another aspect of the invention provides for a method of hitless ODUflex connection resizing in an optical transport network by decrementing the matching time slot used for the incrementing operation, in case of unsuccessful incrementing operation between nodes.
    Type: Application
    Filed: September 13, 2013
    Publication date: March 20, 2014
    Applicant: Tejas Netowrks Limited
    Inventors: Nishant Sharma, Nikhil Kumar Satyarthi
  • Publication number: 20140079393
    Abstract: A system, method, and optical switch for communicating timing. A determination is made whether one of a number of data streams are available. Packets are received at a remote node in response to determining one of the number of data streams is available. A timing characteristic of the at least one of the packets is associated with a tick of a reference clock. The tick of the reference clock is extracted utilizing the timing characteristic of the at least one of the packets. A secondary clock is disciplined with the reference clock by adjusting the secondary clock based on a difference between times measured by the reference clock and the secondary clock to generate a clock signal. The clock signal is communicated to one or more interfaces for distributing.
    Type: Application
    Filed: December 3, 2013
    Publication date: March 20, 2014
    Applicant: CENTURYLINK INTELLECTUAL PROPERTY LLC
    Inventors: Gregory A. Wolfe, Michael Bugenhagen
  • Patent number: 8670663
    Abstract: Methods, systems, and computer-readable media provide for notifying an optical line termination (OLT) of a power failure. According to embodiments, a method for notifying an OLT of a power failure is provided. According to the method, a notification of a power failure at an optical network termination (ONT) is received. In response to receiving the notification, power is retrieved from a dedicated power storage unit dedicated to providing power for the transmission of a dying gasp alarm. The dying gasp alarm is transmitted to the OLT utilizing at least a portion of the power from the dedicated power storage unit. The dying gasp alarm notifies the OLT of the power failure.
    Type: Grant
    Filed: November 28, 2012
    Date of Patent: March 11, 2014
    Assignee: AT&T Intellectual Property I, L.P.
    Inventors: Glenn Mark Mahony, Mounire El Houmaidi
  • Publication number: 20140050478
    Abstract: A system for transporting a plurality of analog and/or digital signals over an optical fiber can include one or more master modems for modulating digital signals and/or RF inserters modulating video signals. The RF signals from the modem(s)/RF inserters are up-converted resulting in frequency bands that are non-overlapping and are spaced apart within a single sub-octave. The sub-octave signal is then converted into an optical signal and directed onto an end of an optical fiber. At the downstream end of the optical fiber, the received optical signal is converted to an RF signal at an optical receiver. The RF signal is then filtered, down-converted and directed to a selected coaxial distribution unit. From the coaxial distribution unit, the RF signal is demodulated, e.g. at a slave modem, to recover the initial analog and/or digital signal.
    Type: Application
    Filed: October 4, 2012
    Publication date: February 20, 2014
    Inventors: Chen-Kuo Sun, Peter H. Wolff
  • Patent number: 8655169
    Abstract: Consistent with the present disclosure, based on system requirements or in response to an increase in optical signal-to-noise level of an optical channel, such as a WDM channel, additional FEC bits are inserted into and replace selected data payload bits in each frame carried by the channel. The replaced data payload bits may then be transmitted in subsequent frames on the same channel. As a result, the transmitted frames have a reduced data payload rate, but a higher coding gain. Alternatively, the replaced data payload bits may be included in frames transmitted on another optical channel. In that case, the frames carried by the two channels typically have the same bit length or number of bits and may thus be compliant with the frame length requirements of G.709, for example. Preferably, the number of coding bits may be changed dynamically to obtain different coding gains.
    Type: Grant
    Filed: September 29, 2008
    Date of Patent: February 18, 2014
    Assignee: Infinera Corporation
    Inventors: Drew D. Perkins, David F. Welch
  • Patent number: 8644709
    Abstract: A multiport passive optical signal sharing device enabling optical signals received by each of a first plurality of ports of the device to be transmitted to all of the ports of a second plurality of ports of the device. The device includes a first coupling mechanism adapted to combine signals received by each port of the first plurality of ports of said device into a first optical signal, the first optical signal being transmitted over a bi-directional optical link. The device further includes a second coupling mechanism and guide for redirecting the first optical signal in a form of a second optical signal into the bi-directional optical link, in the opposite direction from that of the first optical signal, the first coupling mechanism being adapted to duplicate the second optical signal on each port of the second plurality of ports of the device.
    Type: Grant
    Filed: September 7, 2010
    Date of Patent: February 4, 2014
    Assignee: AIRBUS Operations S.A.S.
    Inventors: Juan Lopez, Sebastien Delorge, Alexandre Touya
  • Patent number: 8639117
    Abstract: A dynamic bandwidth allocation apparatus of a passive optical network detects guarantee agreement information of each transmission container (T-CONT) queue of at least one optical network unit (ONU) that is connected to the dynamic bandwidth allocation apparatus in order to dynamically allocate a bandwidth is provided. The dynamic bandwidth allocation apparatus sets a queue threshold according to a buffer size of each T-CONT queue of at least one ONU, and calculates a service level agreement (SLA) parameter of at least one ONU using guarantee agreement information and a queue threshold. The dynamic bandwidth allocation apparatus allocates a bandwidth for every frame of each ONU using each SLA parameter of at least one ONU.
    Type: Grant
    Filed: November 8, 2010
    Date of Patent: January 28, 2014
    Assignee: Electronics and Telecommunications Research Institute
    Inventors: Hark Yoo, Geun Yong Kim, Youngsuk Lee, Sung Chang Kim, Jong Deog Kim, Dongsoo Lee
  • Publication number: 20140023374
    Abstract: A drive circuit includes a bias current supply circuit for supplying a bias current to a light-emitting device for transmitting an optical signal, the light-emitting device included in a light-emitting circuit; and a modulation current supply circuit for supplying a modulation current of a magnitude according to a logical value of data to be transmitted, to the light-emitting device. The modulation current supply circuit includes a differential drive circuit for switching whether to supply a current to the light-emitting device, according to the logical value of the data; and a termination resistor connected between differential outputs of the differential drive circuit. The differential drive circuit and the light-emitting circuit are DC-coupled to each other, and power supply of the current supplied to the light-emitting device by the differential drive circuit is supplied from the light-emitting circuit.
    Type: Application
    Filed: April 2, 2012
    Publication date: January 23, 2014
    Applicant: SUMITOMO ELECTRIC INDUSTRIES, LTD.
    Inventor: Shuitsu Yuda
  • Patent number: 8630550
    Abstract: Disclosed is an optical amplifier which includes an upward optical amplifier configured to amplify an input upward optical signal of an input optical signal; and a control circuit configured to control an operation of the upward optical amplifier according to whether an upward stream is detected from the input upward optical signal.
    Type: Grant
    Filed: August 30, 2011
    Date of Patent: January 14, 2014
    Assignee: Electronics and Telecommunications Research Institute
    Inventors: Mun Seob Lee, Jong Deog Kim, Dongsoo Lee, Sung Chang Kim, Hark Yoo, Geun Yong Kim, Youngsuk Lee, Sim-Kwon Yoon
  • Publication number: 20130343759
    Abstract: An optical-coax unit (OCU) includes an optical PHY to receive and transmit optical signals and a coax PHY to receive and transmit coax signals. The OCU also includes a media-independent interface to provide a first continuous bitstream from the optical PHY to the coax PHY and a second continuous bitstream from the coax PHY to the optical PHY. The first continuous bitstream corresponds to received optical signals and transmitted coax signals, and the second continuous bitstream corresponds to received coax signals and transmitted optical signals.
    Type: Application
    Filed: March 11, 2013
    Publication date: December 26, 2013
    Applicant: QUALCOMM Incorporated
    Inventors: Christian Pietsch, Nicola Varanese, Juan Montojo, Andrea Maria Garavaglia
  • Publication number: 20130336659
    Abstract: The present invention relates to an optical transmitter for transmitting data. The optical transmitter includes a pulse generator for generating N data streams overlapping in time from a de-multiplexed data source. Each respective data stream has pulses with shapes unique to that respective data stream. The transmitter also includes an optical source optically transmitting an output pulse that is generated by summing the uniquely shaped pulses from each respective data stream that are overlapping in time. Each output pulse represents N bits of the data source, where N>1.
    Type: Application
    Filed: January 10, 2012
    Publication date: December 19, 2013
    Applicant: RENSSELAER POLYTECHNIC INSTITUTE
    Inventors: Partha S. Dutta, Sruthi Muralidharan
  • Patent number: 8611751
    Abstract: Systems, apparatus and method for modulating digital data onto an optical carrier to produce a modulated optical carrier in which symbol-modulated optical signals of orthogonal polarizations are temporally interleaved and adapted to be processed by electronic time-division demultiplexing to recover the digital data modulated onto the orthogonal polarizations of the optical signals.
    Type: Grant
    Filed: February 25, 2010
    Date of Patent: December 17, 2013
    Assignee: Alcatel Lucent
    Inventors: Xiang Liu, Chandrasekhar Sethumadhavan
  • Patent number: 8611746
    Abstract: A system and an associated method of bidirectional optical transmission between a central terminal (101) and a plurality of client terminals (11, 12) via a passive optical network (PON) (3), wherein the conversion of an OTDM signal into a WDM signal (respectively the conversion of a WDM signal into an OTDM signal) is effected by an optical converter (20) (respectively 21) by a soliton trapping effect during a downlink (respectively uplink) transmission stage.
    Type: Grant
    Filed: December 20, 2006
    Date of Patent: December 17, 2013
    Assignee: France Telecom
    Inventors: Erwan Pincemin, Franck Payoux
  • Publication number: 20130330082
    Abstract: The present invention relates to transmission and reception of data over a plastic optical fibre. In particular, the present invention provides for transmission and reception over the plastic optical fibre a particularly suitable frame structure. The frame structure includes a synchronization sequence and portions of user data alternating with alternating reference signal portions and control data portions. The length of the user data portions may be equal, the length of the synchronization sequence and the control data and reference signal portions may also be equal. The distances between the synchronization sequence and the reference signal portions and the control data portions are advantageously equal. The alternating of data and additional information avoids data decoding latency while maintaining the rate necessary for the additional information.
    Type: Application
    Filed: April 4, 2013
    Publication date: December 12, 2013
    Applicant: Knowledge Development for POF, S.L.
    Inventors: Rúben Pérez De Aranda Alonso, Pedro Reviriego Vasallo, Dunia Prieto Francia, David Ortiz Rojo
  • Patent number: 8606109
    Abstract: A technique for forwarding downstream packets in a GPON comprising an OLT unit having a physical PON port connected to N Optical Network Termination (ONT) units by optical fibers. The physical PON port accommodates N individual virtual GEM ports terminated with the N ONT units (ONTs) which form N:1 service. The technique comprises assigning in the physical port of the OLT unit a virtual GEM port being a shared broadcast GEM port terminated with all the N ONTs of the N:1 service. Those downstream packets applied to the physical PON port, which would otherwise be flooded—such as broadcast packets or packets having unknown destination address—will now be forwarded only via the shared broadcast GEM port.
    Type: Grant
    Filed: September 22, 2008
    Date of Patent: December 10, 2013
    Assignee: ECI Telecom Ltd
    Inventor: Ido Ouzieli
  • Patent number: 8588257
    Abstract: One embodiment of the present invention provides a system that accommodates different clock frequencies in an Ethernet passive optical network (EPON). The system receives a signal from an optical line terminal (OLT) at an optical network unit (ONU) and derives an OLT clock. The system also maintains a local clock. The system further receives from the OLT an assignment for an upstream transmission window, during which the ONU can transmit an upstream data burst to the OLT based on the local clock. The system adjusts the number of bits of the data burst without affecting the payload data carried in the data burst, thereby allowing the data burst to fit properly within the upstream transmission window and compensating for frequency differences between the local clock and the OLT clock. The system transmits the data burst based on the local clock in the upstream transmission window.
    Type: Grant
    Filed: March 28, 2011
    Date of Patent: November 19, 2013
    Assignee: Broadcom Corporation
    Inventors: Edward W. Boyd, Ryan E. Hirth, Hung Nguyen
  • Patent number: 8588613
    Abstract: Systems, methods, and computer-readable media for propagating a timing signal over a Dense Wave Division Multiplexer fiber optic network by polarity modulation of the Optical Service Channel are provided. The systems, methods, and computer-readable media may make the timing signal available for use by devices that require a reference timing source.
    Type: Grant
    Filed: December 27, 2007
    Date of Patent: November 19, 2013
    Assignee: AT&T Intellectual Property I, L.P.
    Inventor: Stephen H. Culpepper
  • Publication number: 20130287400
    Abstract: A system and method for carrying a downstream optical signal and an upstream optical signal on a fiber optic link is disclosed. The system and method includes a first transceiver unit that receives an input communication signal from at least one external communication device at an electrical input port, a transmitter that converts the input communication signal into an optical signal and transmits the optical signal as an downstream optical signal on a fiber optic link, a receiver at the second transceiver unit that receives the downstream optical signal and converts the downstream optical signal into an electrical communication signal, and a first circuit in the second transceiver unit that determines whether the second transceiver couples the electrical communication signal to a two wire intercom circuit or a four wire intercom circuit.
    Type: Application
    Filed: March 13, 2013
    Publication date: October 31, 2013
    Applicant: MIRANDA TECHNOLOGIES PARTNERSHIP
    Inventors: James Bennett Hurwitz, David Charles Pelletier
  • Patent number: 8571058
    Abstract: There is provided a terminal apparatus including a message monitor to gather transmission request information from each of first and second terminating apparatus, a dynamic bandwidth allocation unit to allocate each transmission band in accordance with the gathered transmission request information, determine a size and an alignment position of a time slot in accordance with the allocated transmission band, determine a transmission start time of the time slot, and allocate an extinction period so as to stop a transmission of an optical signal between a time slot of the optical signal with the second transmission rate and a time slot following the time slot of the optical signal with the second transmission rate, and a MAC controller to generate a control frame for notifying each of the first and second terminating apparatus of the transmission start time and the size of the time slot.
    Type: Grant
    Filed: November 18, 2010
    Date of Patent: October 29, 2013
    Assignee: Fujitsu Limited
    Inventors: Kyosuke Sone, George Ishikawa, Susumu Kinoshita
  • Patent number: 8571422
    Abstract: A burst transmission method and a receiver resetting method and apparatus in a Passive Optical Network (PON) are provided. A burst receiver resetting method in a PON includes: receiving a preamble sequence and synchronizing data; after synchronizing the data, continuing to receive the data, and matching a Burst Terminator (BT); and resetting a receiver after successfully matching the BT. Meanwhile, an apparatus for implementing the method and a corresponding burst data transmission method are provided. By using the burst receiver resetting method and apparatus in the PON and the corresponding burst transmission method at an Optical Network Unit (ONU) burst transmission end, a Reach Extender (RE) does not need to unpack upstream burst bandwidth allocation information carried in downstream data. Therefore, the complexity of the implementation of the RE is reduced, and the method is simple and effective.
    Type: Grant
    Filed: August 16, 2011
    Date of Patent: October 29, 2013
    Assignee: Huawei Technologies Co., Ltd.
    Inventors: Jing Li, Dongning Feng, Dongyu Geng, Frank Effenberger
  • Publication number: 20130259484
    Abstract: A data transmission device where a low-speed signal transmission frame is included in time slots of a high-speed signal transmission frame and a number of the time slots to include the low-speed signal transmission frame is variable, wherein the time slots have respective time slot numbers, includes a storage unit storing signal data of the high-speed signal transmission frame corresponding to the number of the time slots based on a time slot number basis, wherein the signal data of the high-speed signal transmission frame are supplied on the time slot number basis; and a selection and output unit selecting and sequentially outputting the signal data on the time slot number basis, wherein the signal data have been stored in accordance with the number of the time slots.
    Type: Application
    Filed: March 1, 2013
    Publication date: October 3, 2013
    Applicant: FUJITSU LIMITED
    Inventors: Hidetaka KAWAHARA, Junichi SUGIYAMA, Wataru ODASHIMA, Shota SHINOHARA, Hiroyuki HOMMA
  • Patent number: 8532491
    Abstract: A passive optical network system such that the power consumption can be reduced as much as possible according to the end-user traffic. An OLT uses the DBA function thereof and sequentially uses frequencies in ascending order of transmission rate in order to sequentially allocate bands to ONUs in ascending order of the requested bandwidth. At this time, a frequency to be allocated is selected so that the bandwidth allocated to each ONU is narrower than a maximum bandwidth through which transmission using the allocated wavelength is enabled. An OLT uses a grant area to specify the transmission timing of the secondary station and to inform the specified transmission timing to the secondary station. In addition, an area is set for storing information used to inform the secondary station of a new frequency to be used.
    Type: Grant
    Filed: April 7, 2009
    Date of Patent: September 10, 2013
    Assignee: Hitachi, Ltd.
    Inventors: Norihiro Sakamoto, Tohru Kazawa, Yusuke Yajima, Akihiko Tsuchiya
  • Publication number: 20130202304
    Abstract: Example registration procedures for Ethernet Passive Optical Network Over Coax (EPOC) are provided. The procedures are compliant with the Ethernet Passive Optical Network (EPON) standard. The procedures cover initial coaxial media converter (CMC) registration; physical layer discovery and link up over a coaxial link of an EPOC network; and medium access control (MAC)-level discovery and link up over an EPOC network. As such, the procedures can he used to fully bring air EPOC network to user traffic readiness. In addition, the procedures, or a variation thereof, can be used to enable periodic maintenance of the coaxial link of the EPOC network, thereby maintaining adequate communication conditions over the coaxial link.
    Type: Application
    Filed: June 22, 2012
    Publication date: August 8, 2013
    Applicant: Broadcom Corporation
    Inventors: Edward W. BOYD, Sanjay Goswami, Josh Melcon
  • Patent number: 8488964
    Abstract: In an access network using optical switches, communications between an OLT and ONUs are established without a photoelectric conversion performed at an optical switching unit. The OLT controls the downlink optical switch SW(DOWN) to sequentially select each ONU in slots arranged in a discrete manner, and transmits a Discovery Gate message. Upon receipt of the Discovery Gate message, each ONU consecutively transmits Register Request messages. The uplink optical switch SW(UP) sequentially switch signals from ONU#1 through ONU#128 in the slots arranged in a discrete manner, and outputs the signals to the OLT, Some of the Register Requests transmitted from the respective ONUs pass through the SW(UP), and reach the OLT. Based on the received Register Requests, the OLT determines the timing of transmission for the ONUS, and notifies the ONUS of the timing of transmission through a Gate message.
    Type: Grant
    Filed: July 3, 2009
    Date of Patent: July 16, 2013
    Assignee: Keio University
    Inventors: Naoaki Yamanaka, Yutaka Arakawa, Kazumasa Tokuhashi
  • Patent number: 8488965
    Abstract: It is necessary to completely remove overlapping of signals between plural PONs in order to make the PONs coexist. Accordingly, it is required to share or intensively manage bandwidth use conditions over an optical fiber that serves as a common band between plural systems. Therefore, transmission clocks should be synchronized with high accuracy between plural systems. A reference clock is provided from an external device or a representative OLT to the entire systems to perform clock synchronization between plural systems, so that the overall systems are synchronized by synchronizing each OLT with the reference clock. A hierarchical management method is selected that manages ONUs under the control of each OLT by managing band use information arranged for each OLT with respect to an external device or a representative OLT for sharing of bandwidth use conditions between plural systems.
    Type: Grant
    Filed: December 18, 2008
    Date of Patent: July 16, 2013
    Assignee: Hitachi, Ltd.
    Inventors: Masahiko Mizutani, Toshiki Sugawara, Hiroki Ikeda
  • Publication number: 20130170838
    Abstract: A cross connecting unit outputs an including frame whose type matches a type of an including frame stored in a storage unit in association with identification information of a multiplexing unit having a problem among including frames generated by an including unit to a backup multiplexing unit when any one of multiplexing units has a problem.
    Type: Application
    Filed: September 6, 2011
    Publication date: July 4, 2013
    Applicant: NEC CORPORATION
    Inventor: Masahiko Tsuchiya
  • Publication number: 20130148965
    Abstract: Using polarization modulation techniques to simultaneously transmit two different data streams (formatted according to two different protocols) over a single optical wavelength. A first data stream that is encapsulated for transport using a first transport protocol, and a second data stream that is encapsulated for transport using a second transport protocol are received. The first data stream is modulated on a wavelength with a first polarization mode of a polarization division modulation scheme to produce a first modulated data stream and the second data stream is modulated on the wavelength with a second polarization mode of the polarization division multiplex transmission scheme to produce a second modulated data stream having the second polarization mode. The second polarization mode is orthogonal to the first polarization mode. The first and second data streams are combined onto a single wavelength for transmission over a single optical fiber using a polarization beam combiner.
    Type: Application
    Filed: December 7, 2011
    Publication date: June 13, 2013
    Applicant: CISCO TECHNOLOGY, INC.
    Inventors: Giacomo Losio, Gilberto Loprieno, Theodor Kupfer