Multiplex Patents (Class 398/43)
  • Publication number: 20120315036
    Abstract: Methods and systems for encoding multi-level pulse amplitude modulated signals using integrated optoelectronics are disclosed and may include generating a multi-level, amplitude-modulated optical signal utilizing an optical modulator driven by two or more electrical input signals. The optical modulator may include optical modulator elements coupled in series and configured into groups. The number of optical modular elements and groups may configure the number of levels in the multi-level amplitude modulated optical signal. Unit drivers may be coupled to each of the groups. The electrical input signals may be synchronized before communicating them to the unit drivers. Phase addition may be synchronized utilizing one or more electrical delay lines. The optical modulator may be integrated on a single substrate, which may include one of: silicon, gallium arsenide, germanium, indium gallium arsenide, polymers, or indium phosphide.
    Type: Application
    Filed: August 7, 2012
    Publication date: December 13, 2012
    Inventors: Daniel Kucharski, Brian Welch, Sherif Abdalla
  • Publication number: 20120307617
    Abstract: Techniques are provided for increasing spectral efficiency over data channels in a storage or communication system. In some embodiments, data may be encoded and transmitted over multiple channels. The transmitted data from the multiple channels may be considered together as a channel bundle, thereby increasing the edge transitions of the group of signals to improve clock recovery and reduce coding constraints. In some embodiments, the channel bit size is reduced to maximize data rates based on the reduced coding constraints. Furthermore, the channel bundle has only one channel with timing markers, so that a receiver may receive information from the channel bundle and recover clocking based on the timing markers in the one channel.
    Type: Application
    Filed: June 6, 2011
    Publication date: December 6, 2012
    Inventors: John Anderson Fergus Ross, Michael James Hartman, John Erik Hershey, Richard Louis Zinser, Xiaolei Shi
  • Patent number: 8326146
    Abstract: The invention relates to a communications node (10) for routing an optical signal 5 comprising at least one data packet, the node (10) having an input optic fiber (12) and an output optic fiber (14) in communication with each other, the input optic fiber (12) in communication with an optical splitter (20) which is arranged to split an incoming optical signal into at least two substantially identical optical signals, the optical splitter (20) further arranged to pass one of the optical signals to an optical correlator (22) and the other of the optical signals to an input optical switch (24), the optical correlator (22) being arranged to compare an address of the packet with a reference address (40) and to generate a trigger if the reference address (40) matches the address of the packet, the input optical switch (24) being arranged to route the data packet to an optical to electrical converter (28) in response to the trigger.
    Type: Grant
    Filed: March 15, 2007
    Date of Patent: December 4, 2012
    Assignee: Telefonaktiebolaget L M Ericsson (publ)
    Inventor: Atilla Bader
  • Publication number: 20120301136
    Abstract: A communication system and method that allows a transmitter segment (ground end of uplink segment) to dynamically combine power from a plurality of propagation channels (transponders) to improve power levels of signals being transmitted, without affecting the receiver segment (user end of downlink segment) and the propagation segment (space segment), and without modifying propagation apparatus configurations (satellite). Specifically, the transmitter segment generates mixtures of input signals by using Wavefront-Multiplexing and transmits wavefront-multiplexed (WFM) signals through propagation channels to a receiver segment that coherently separates the mixtures of received WFM signals by using adaptive equalization and Wavefront-De-Multiplexing.
    Type: Application
    Filed: November 23, 2011
    Publication date: November 29, 2012
    Inventor: Donald C. D. Chang
  • Publication number: 20120294607
    Abstract: A spatially multiplexed optical link having a plurality of transmission paths, wherein at least one transmission path is configured to carry an optical-pump signal while one or more other transmission paths carry data-bearing signals. Disposed within the optical link are an optical signal-distribution module and an amplifier module. The optical signal-distribution module is configured to couple portions of the optical-pump signal into the data-bearing transmission paths. The amplifier module is configured to amplify the data-bearing signals using these portions of the optical-pump signal as a power source in a suitable all-optical amplification scheme. The optical-pump signal can optionally be tapped and applied to a photovoltaic element configured to directly power a device, e.g., an optical performance monitor, or to charge the battery of that device to enable its autonomous operation if external electrical power is not available where the device is deployed.
    Type: Application
    Filed: May 20, 2011
    Publication date: November 22, 2012
    Inventors: Peter J. Winzer, Andrew R. Chraplyvy
  • Publication number: 20120294609
    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: Application
    Filed: June 28, 2012
    Publication date: November 22, 2012
    Inventors: Raymond W.K. LEUNG, Dongyu GENG, Dongning FENG, Frank Effenberger, Sergio Benedetto, Guido Montorsi, Jing LI
  • Patent number: 8311412
    Abstract: Distributed CMTS device for a HFC CATV network serving multiple neighborhoods by multiple individual cables, in which the QAM modulators that provide data for the individual cables are divided between QAM modulators located at the cable plant, and remote QAM modulators ideally located at the fiber nodes. A basic set of CATV QAM data waveforms may be transmitted to the nodes using a first fiber, and a second set of IP/on-demand data may be transmitted to the nodes using an alternate fiber or alternate fiber frequency, and optionally other protocols such as Ethernet protocols. The nodes will extract the data specific to each neighborhood and inject this data into unused QAM channels, thus achieving improved data transmission rates through finer granularity. A computerized “virtual shelf” control system for this system is also disclosed. The system has high backward compatibility, and can be configured to mimic a conventional cable plant CMTS.
    Type: Grant
    Filed: January 22, 2010
    Date of Patent: November 13, 2012
    Inventor: Selim Shlomo Rakib
  • Publication number: 20120281979
    Abstract: A method comprising identifying a data demand of an optical channel request; identifying available resources for satisfying the optical channel request; selecting light paths to a destination based on the identified available resources, wherein each light path is distinct; selecting one or more optical carriers for each light path; optically transmitting data pertaining to the optical channel request based on the selected light paths, wherein each selected optical carrier of each light path carries a portion of the data and a total of the one or more optical carriers associated with the light paths collectively carry an entire portion of the data; receiving the one or more optical carriers of the light paths at the destination; identifying a latency between the one or more optical carriers of the light paths; adjusting the latency between the one or more optical carriers of the light paths; and assembling the data.
    Type: Application
    Filed: May 3, 2011
    Publication date: November 8, 2012
    Inventors: Tiejun J. Xia, Glenn A. Wellbrock
  • Patent number: 8306369
    Abstract: An optical hybrid circuit includes a multimode interference coupler; a first 2:2 optical coupler; a second 2:2 optical coupler; a third 2:2 optical coupler; and a phase controlling region. The first 2:2 optical coupler, the second 2:2 optical coupler, and the third 2:2 optical coupler are coupled to one of the pair of first output channels, the pair of second output channels, the pair of third output channels, and the pair of fourth output channels of the multimode interference coupler. The phase controlling region is provided in one or both of each pair of at least two pairs of output channels from among three pairs of output channels to which the first 2:2 optical coupler, the second 2:2 optical coupler, and the third 2:2 optical coupler are coupled, respectively.
    Type: Grant
    Filed: December 17, 2010
    Date of Patent: November 6, 2012
    Assignee: Fujitsu Limted
    Inventor: Seok Hwan Jeong
  • Patent number: 8306025
    Abstract: A method for implementing the subscriber port positioning by broadband access equipments, includes: when the subscriber initiates an access request, the multi-port terminal equipment captures the access request message, adds the subscriber basic information into the access request message, and transmits it to the office equipment; the single-port terminal equipment forwards the access request message to the office equipment directly; the office equipment captures the access request message, adds the terminal basic information into the access request message and forwards it to the broadband access server; for the multi-port terminal equipment, the terminal basic information and the subscriber basic information comprises the subscriber port positioning information; for the single-port terminal equipment, the terminal basic information is taken as the subscriber port positioning information; after the broadband access server receives the access request message, it extracts the subscriber port positioning informa
    Type: Grant
    Filed: December 12, 2007
    Date of Patent: November 6, 2012
    Assignee: ZTE Corporation
    Inventors: Lin Ji, Liquan Yuan, Huannan Ma
  • Patent number: 8306424
    Abstract: The present invention provides a remodulating channel selector for a wavelength division multiplexed optical communication system. The remodulating selector receives a WDM input signal, selects a particular optical channel from the WDM signal and places the information from the selected signal onto a newly-generated optical output signal. The wavelength of the output optical signal can be the same as or different from one of the optical channels which comprises the WDM input signal. When used in a WDM optical communication system with remodulators at the transmission input, the remodulating selectors provide complete control over the interfaces with optical transmitters and receivers, permitting use with a broad range of optical equipment.
    Type: Grant
    Filed: August 24, 2010
    Date of Patent: November 6, 2012
    Assignee: Ciena Corporation
    Inventors: Stephen B. Alexander, Steve W. Chaddick, Roy C. Litz, Cecil D. Smith
  • Publication number: 20120269509
    Abstract: The present invention relates to a remote electronic component, such as a remote radio head, for a wireless communication system, to a remote electronic component array and to an external distributor unit. The electronic component includes at least one optical input connector for connecting the remote electronic component with a control device using an optical data line, at least one optical output connector, and at least one optical splitter/combiner unit that is connected to the at least one input connector for splitting an optical path into a first optical paths connected to an internal circuitry communicating with an antenna and a second optical path connected to an optical output connector to be coupled to at least one second remote electronic component. Alternatively, an external distributor unit with an optical splitter/combiner unit may be provided.
    Type: Application
    Filed: April 21, 2011
    Publication date: October 25, 2012
    Inventor: Antonius Petrus Hultermans
  • Publication number: 20120263472
    Abstract: In one embodiment, a system includes at least one tone generator, a first transmitter, and a second transmitter. The at least one tone generator is operable to generate a plurality of modulation tones comprising at least a first modulation tone having a first tone frequency and a second modulation tone having a second tone frequency that is different from the first tone frequency. The first transmitter is operable to apply the first modulation tone to a first optical signal such that at least a portion of the first optical signal is divided into one or more sidebands. The second transmitter is operable to apply the second modulation tone to a second optical signal such that at least a portion of the second optical signal is divided into one or more sidebands.
    Type: Application
    Filed: April 13, 2011
    Publication date: October 18, 2012
    Applicant: Cisco Technology, Inc.
    Inventors: Kuang-Yi Wu, Mary R. Phillips, Fred S. Hirt
  • Publication number: 20120251120
    Abstract: Consistent with the present disclosure, data, in digital form, is received by a transmit node of an optical communication system, and converted to an analog signal by a digital-to-analog converter (DAC) to drive a modulator. The modulator, in turn, modulates light at one of a plurality of wavelengths in accordance with the received data forming a plurality of corresponding carriers. The carriers are modulated according to one of a plurality of modulation formats and then optically combined to form a superchannel of a constant maximum capacity, for example. Accordingly, the number of carriers and the bit rate for each carrier remain constant for each modulation format to realize a constant maximum capacity. The superchannel is then transmitted over an optical communication path to a receive node. At the receive node, the superchannel is optically demultiplexed from a plurality of other superchannels.
    Type: Application
    Filed: April 1, 2011
    Publication date: October 4, 2012
    Inventors: John D. McNicol, Kuang-Tsan Wu, Han Henry Sun
  • Patent number: 8280255
    Abstract: The present invention provides a system, apparatus and method to provide for amplification at various points along one or more optical paths of a photonic integrated circuit. According to various embodiments of the invention, the photonic integrated circuit includes a plurality of optical devices having associated characteristics which may have lead to optical signal degradation. One or more optical amplifiers provided along one or more optical paths of the photonic integrated circuit compensate for such signal degradation, resulting in a highly configurable photonic integrated circuit. The various optical devices of the photonic integrated circuit may be provided on a single substrate.
    Type: Grant
    Filed: December 23, 2009
    Date of Patent: October 2, 2012
    Assignee: Infinera Corporation
    Inventors: Charles H. Joyner, Radhakrishnan L. Nagarajan, Peter W. Evans
  • Patent number: 8280258
    Abstract: The present disclosure provides optical communication systems and methods that utilize, on top or in place of the conventional framework: (1) optical amplifiers that are provided with extended bandwidth coverage, such as Extended Band Erbium-Doped Fiber Amplifiers (EDFAs), combination of Raman amplifiers and EDFAs, Split-Band C+L EDFAs, etc.
    Type: Grant
    Filed: June 30, 2009
    Date of Patent: October 2, 2012
    Assignee: Ciena Corporation
    Inventor: Michael Y. Frankel
  • Patent number: 8280253
    Abstract: An optical telecommunications network terminal includes a device for generating downlink optical signals and a device for receiving uplink optical signals, the optical signals being conveyed in optical transmission means connected to the terminal. More particularly, the generator device is adapted to generate a continuous optical signal at wavelength ?ii and having an initial power greater than a power threshold for the occurrence of a stimulated Brillouin effect, above which threshold said continuous optical signal induces in the optical transmission means a continuous Brillouin backscattering uplink optical signal at wavelength ??ii. The optical signal receiver device further includes means for analyzing the power of said continuous Brillouin backscattering optical signal at wavelength ??ii.
    Type: Grant
    Filed: June 20, 2007
    Date of Patent: October 2, 2012
    Assignee: France Telecom
    Inventors: Naveena Genay, Jean-Luc Courant, Philippe Chanclou
  • Publication number: 20120237203
    Abstract: There is provided an optical transmission system including: an optical transmitting apparatus including: a first processing circuit configured to process a transmission signal to be transmitted, a second processing circuit configured to process overhead data, the processed overhead data being multiplexed to the transmission signal, a retaining circuit configured to retain the overhead data, the retained overhead data being multiplexed to the transmission signal; and an insertion circuit configured to generate an identifier to be inserted into the retained overhead data; and an optical receiving apparatus including a detecting circuit configured to receive the transmission signal transmitted from the optical transmitting apparatus, and detect the identifier, wherein, when the overhead data is a predetermined state, the first processing circuit multiplexes the retained overhead data into which the identifier is inserted and the detecting circuit detects the identifier.
    Type: Application
    Filed: March 13, 2012
    Publication date: September 20, 2012
    Applicant: Fujitsu Limited
    Inventor: Tomoyoshi FUJIMORI
  • Publication number: 20120230685
    Abstract: A transmitter for transmitting an optical signal based on a baseband signal, including an up-transformer for up-transforming the baseband signal to obtain a bandpass signal and a converter for converting the bandpass signal into a signal having a DC-offset. The transmitter further includes a modulator for modulating a light source with the signal having the DC-offsets to transmit the optical signal.
    Type: Application
    Filed: March 19, 2012
    Publication date: September 13, 2012
    Inventors: Peter Jung, Guido Bruck
  • Publication number: 20120230686
    Abstract: The present invention discloses a synchronisation method suitable for increasing the receiving speed in the receiving part of an orthogonal optical frequency division multiplexing (OOFDM) transceiver.
    Type: Application
    Filed: October 29, 2010
    Publication date: September 13, 2012
    Applicant: Bangor University
    Inventors: Jianming Tang, Xianqing Jin
  • Patent number: 8260135
    Abstract: In a PON system with WDM, at the time of initial setting, each ONU negotiates with an OLT, and automatically acquires a wavelength which can be used by the ONU. One wavelength for negotiation of assigned wavelength is fixed as a default, and a newly connected ONU first uses the wavelength. The OLT 200 includes a plurality of light sources for downstream communication. The ONU 300 includes a wavelength variable filter selectively receiving one of wavelengths of downstream communication, and a wavelength variable light source selectively emitting light of one of plural wavelengths for upstream communication. The ONU 300 uses a transmission wavelength (for example, ?u32) for negotiation and transmits a wavelength assignment request 1000 to the OLT 200. The OLT 200 selects a wavelength ?u1 to be assigned from unused wavelengths, and transmits wavelength information to the ONU 300. The OLT 200 and the ONU 300 communicates using the notified wavelengths.
    Type: Grant
    Filed: December 20, 2010
    Date of Patent: September 4, 2012
    Assignee: Hitachi, Ltd.
    Inventors: Tohru Kazawa, Kenichi Sakamoto, Ryosuke Nishino
  • Patent number: 8260133
    Abstract: Systems and methods are described that provide a distributed restoration signaling protocol for shared mesh restoration with standbys for transparent optical networks.
    Type: Grant
    Filed: September 4, 2009
    Date of Patent: September 4, 2012
    Assignee: AT&T Intellectual Property I, L.P.
    Inventors: Guangzhi Li, Angela Lan Chiu, Robert Duncan Doverspike, John L. Strand
  • Publication number: 20120213514
    Abstract: Systems and methods in accordance with embodiments of the invention convert satellite signals to an intermediate frequency signal and selecting modulated digital data within the satellite signals for content decoding. One embodiment includes an optical low noise block converter (LNB) including a digital channelizer switch configured to select at least one content channel from an input signal including a plurality of content channels modulated onto a carrier and to output an optical signal including the selected at least one content channel.
    Type: Application
    Filed: February 15, 2012
    Publication date: August 23, 2012
    Applicant: Mobius Semiconductor, Inc.
    Inventor: Tommy Yu
  • Patent number: 8244129
    Abstract: There are provided a polarized light passing device to pass therethrough specific polarized light, of output light of a polarization scrambler; and a detecting unit to detect a modulation component according to a frequency of a polarization control signal from the light which passes through the polarized light passing device.
    Type: Grant
    Filed: January 21, 2009
    Date of Patent: August 14, 2012
    Assignee: Fujitsu Limited
    Inventors: Shinichi Kaneko, Shinichiro Harasawa, Kenji Ohta
  • Patent number: 8238752
    Abstract: A PON station side apparatus is provided with a selection section and a receiving section. For multiple data transferred from multiple PON terminal apparatuses that transmit data at different communication speeds in time division multiplexing, the selection section selects any of the multiple receiving circuits to be a receiving circuit for a receiving destination at which data is received on the basis of the transmission time zones for the data. The receiving section switches the receiving circuit selected by the selection section among the multiple receiving circuits to be the receiving circuit for the destination at which data is received of the data and receives the data through the switched receiving circuit.
    Type: Grant
    Filed: January 29, 2009
    Date of Patent: August 7, 2012
    Assignee: NEC Corporation
    Inventor: Sadaichirou Ogushi
  • Patent number: 8238325
    Abstract: Full-mesh WDM transmission units, each of which includes n number of interfaces and is capable of establishing a bidirectional full-mesh communication between all of the interfaces using wavelength paths based on a wavelength division multiplexing technique, are connected in a multistage tree-shaped structure by internetwork connection units through edge-packet transfer units connected to the respective interfaces. Therefore, it is possible to hold a direct communication between user terminals connected to the edge-packet transfer units of the same full-mesh WDM transmission unit, and to realize scalability by a multistage connection configuration.
    Type: Grant
    Filed: October 25, 2005
    Date of Patent: August 7, 2012
    Assignee: Nippon Telegraph and Telephone Corporation
    Inventors: Kazuhiro Hayakawa, Satoru Yoshida, Makoto Fukuda, Nobuo Shigeta, Kazuhiko Ogawa, Shin Hashimoto
  • Patent number: 8238373
    Abstract: A method and a device for mapping Ethernet code blocks to an optical transport network (OTN) for transmission are provided. According to a preset mapping manner, 40 Gigabit (40 G) Ethernet code blocks are mapped to a payload area of a general frame provision (GFP) frame, or a plurality of 40 G Ethernet code blocks is interleaved into a payload area of an OTN frame, or 40 G Ethernet code blocks are mapped to an OTN frame according to an asynchronous bit-stream mapping manner. Thus, specific solutions for mapping 40 G Ethernet code blocks having an encoding rate lower than a minimum payload bandwidth of the OPU3 to the OTN for transmission is provided.
    Type: Grant
    Filed: December 9, 2009
    Date of Patent: August 7, 2012
    Assignee: Huawei Technologies Co., Ltd.
    Inventor: Zhangzhen Jiang
  • Patent number: 8233794
    Abstract: A wavelength selective switch (WSS) based on an array of MEMS mirrors tiltable in 1-dimension about only one axis exhibits “hitting” or unwanted port connections during switching. Two WSS's can be cascaded to create M×N switching functionality in a hitless manner by the inclusion of block ports at specified positions in one or both of the WSS's. Greater use efficiency of ports can be achieved if quasi-hitless performance is acceptable.
    Type: Grant
    Filed: September 9, 2009
    Date of Patent: July 31, 2012
    Inventors: Paul Colbourne, Sheldon McLaughlin, Stephen Robert de Hennin, Pierre D. Wall
  • Publication number: 20120189304
    Abstract: Embodiments of the present invention relate a method, an apparatus, and a system for assigning a tributary port number. The method includes: receiving a service path request message which is sent by a neighboring node and carries a service type; determining, according to the service path request message, an OTU link used to bear the ODU service, determining and reserving, according to the service type in the service path request message, a free tributary slot resource used to bear the ODU service in the OTU link, and assigning a tributary port number to the free tributary slot resource; and sending a service path acknowledgment message to the neighboring node.
    Type: Application
    Filed: March 30, 2012
    Publication date: July 26, 2012
    Applicant: Huawei Technologies Co., Ltd.
    Inventors: Yi Lin, Qiuyou Wu, Fatai Zhang, Jianrui Han, Xiaobing Zi
  • Publication number: 20120189303
    Abstract: An optical line card system includes one or more input interfaces for receiving information, a line interface comprising a plurality of line transponders, and a multiplexer for multiplexing output of the one or more input interfaces onto the plurality of line transponders. The one or more input interfaces have an aggregate information rate RC. The plurality of line transponders have an aggregate information rate RL that is less than or approximately equal to the aggregate information rate RC of the one or more of client interfaces. Each of the line transponders employs a modulation format with a spectral efficiency that enables transmission with at most one opto-electronic regeneration point per link to an end point for electronic routing or switching. Each of the plurality of line transponders is configured to insert output on a respective one of a plurality of orthogonally parallel transmission paths.
    Type: Application
    Filed: January 24, 2011
    Publication date: July 26, 2012
    Inventors: Peter J. Winzer, Andrew Roman Chraplyvy, Robert William Tkach
  • Publication number: 20120183289
    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: Application
    Filed: March 10, 2008
    Publication date: July 19, 2012
    Inventors: Xiaoming Lou, Genzao Zhang, Eric Hufstedler, Leonel Gomez, Eva Peral
  • Publication number: 20120183290
    Abstract: An optical signal representing digital data is produced by an opto-electronic semiconductor device having a group of three or more opto-electronic light sources that emit optical signals in accordance with a pulse amplitude modulation (PAM) scheme. The optical signal can be transmitted through an optical fiber coupled to an assembly containing the opto-electronic semiconductor device.
    Type: Application
    Filed: January 19, 2011
    Publication date: July 19, 2012
    Inventor: Nikolaus W. Schunk
  • Publication number: 20120183296
    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: Application
    Filed: September 7, 2010
    Publication date: July 19, 2012
    Applicant: AIRBUS OPERATIONS (S.A.S.)
    Inventors: Juan Lopez, Sabastien Delorge, Alexandre Touya
  • Patent number: 8224184
    Abstract: A wireless communication network architecture 100 is provided. The wireless communication network architecture consists of multiple fiber optic rings 110, 120, 130 and employs a Radio over Fiber (RoF) network. Each of these fiber optic rings is constructed using an optical fiber on a segment 105, 115, 125 formed by dividing a path. Each fiber optic ring includes a number of remote antenna units (RAUs) 181-184, 191-194. Each RAU 4 is integrated into a corresponding Add/Drop Multiplexer (ADM) 186-189, 196-199 and each ADM is further connected to a base station.
    Type: Grant
    Filed: September 29, 2008
    Date of Patent: July 17, 2012
    Assignee: Motorola Mobility, Inc.
    Inventors: Jun Xu, Fei Huang, Kit S. Wong
  • Patent number: 8224135
    Abstract: In a PON system, an OLT periodically transmits a channel resource information block specifying a carrier wavelength and a spreading code on a first downstream channel to which a spread-spectrum spreader having a first spreading code is applied; one of ONUs receives the channel resource information block with a spread-spectrum despreader having the first spreading code and transmits a connection request to the OLT, using the carrier wavelength and the spreading code specified by the channel resource information block; the OLT having received the connection request transmits a new channel resource information block specifying a carrier wavelength and a spreading code to be used on an upstream data channel to the requester ONU through the first channel; and the requester ONU transmits data, using the carrier wavelength and the spreading code specified by the new channel resource information block.
    Type: Grant
    Filed: February 12, 2010
    Date of Patent: July 17, 2012
    Assignee: Hitachi, Ltd.
    Inventors: Masahiko Mizutani, Toshiki Sugawara, Tohru Kazawa, Yoshihiro Ashi
  • Publication number: 20120163796
    Abstract: The present invention discloses a distributed electrical cross apparatus, and a system and method for the distributed electrical cross apparatus implementing an SNC cascade protection. The apparatus includes a backboard and at least four single-boards integrated with electrical cross units, wherein the single-boards are inserted in the limited number of slots in the backboard, and these single-boards also set line-side service access units, client-side service access units and backboard access units. The present invention has both accessing of line-side services and accessing of client-side services in the same single-board, access and flexible scheduling of various services such as line-side services and client-side services and so on are implemented on the backboard with limited number of slots, and the function of the distributed electrical cross system processing various services is increased in the case of low cost.
    Type: Application
    Filed: April 6, 2010
    Publication date: June 28, 2012
    Applicant: ZTE CORPORATION
    Inventors: Dong Wang, Yan Yuan
  • Publication number: 20120155865
    Abstract: An optical signal transmitter of the present invention includes: two phase modulating portions; a phase shifter which displaces carrier phases of two output lights from the phase modulating portions by ?/2; a multiplexing portion which multiplexes two signal lights, carrier phases of the two signal lights being made orthogonal to each other by the phase shifter; a drive signal electrode portion which supplies a differential data signal to each of four paths of interference optical waveguides, each of the two phase modulating portions having the interference optical waveguides, the differential data signal having an amplitude which is equal to a half-wave voltage V? of the two phase modulating portions; a drive amplifier which amplifies the differential data signal to be supplied to each of the four paths of the interference optical waveguides; a data bias electrode portion which supplies a total of four data bias voltages to two arms, each of the two phase modulating portions having the two arms; an orthogona
    Type: Application
    Filed: September 7, 2010
    Publication date: June 21, 2012
    Inventors: Hiroto Kawakami, Eiji Yoshida, Masahiro Tachibana
  • Publication number: 20120155856
    Abstract: An optical transmission system includes transmitter 100 and receiver 200. Transmitter 100 adds state information for identifying a state of transmitter 100, to a signal and transmits the signal to receiver 200. Receiver 200 obtains the state information added to the signal transmitted from transmitter 100 and identifies a state of transmitter 100 based on the obtained state information.
    Type: Application
    Filed: December 14, 2011
    Publication date: June 21, 2012
    Applicant: NEC CORPORATION
    Inventor: Morihiko OTA
  • Patent number: 8204087
    Abstract: An optical communication system is provided. In particular, multi-lane signal transmitting and receiving apparatuses capable of transmitting and receiving a multi-lane signal using the same inverse multiplexing scheme even when optic modules having several transport lane numbers are selected according to a purpose of use are provided. Each OTUk capable of containing a client signal in a transport hierarchy signal (OTUk-Xv) is defined as a virtual container, and Y virtual lanes are allocated to respective virtual containers X, in which identification information for the allocated virtual lanes is inserted into an overhead area and a transport hierarchy multi-lane signal is transmitted in the form of OTUk-XvYd.
    Type: Grant
    Filed: December 9, 2009
    Date of Patent: June 19, 2012
    Assignee: Electronics and Telecommunications Research Institute
    Inventors: Jong-yoon Shin, Jong-ho Kim, Je-soo Ko
  • Patent number: 8200086
    Abstract: A storage area network extension, network and method include a storage terminal coupled to a remote node. The remote node is connected to a passive optical network (PON) for transferring data signals in the PON and storage signals to/from the storage terminal by employing subcarrier channels in the PON to enable concurrent bidirectional transfer of the data and the storage signals. A storage area network is coupled to the storage terminal and configured to store and retrieve the storage signals for transfer over the PON.
    Type: Grant
    Filed: March 7, 2008
    Date of Patent: June 12, 2012
    Assignee: NEC Laboratories America, Inc.
    Inventors: Yuanqiu Luo, Si Yin, Jianjun Yu, Lei Zong
  • Publication number: 20120141123
    Abstract: The present invention discloses an adapting apparatus and method, the apparatus comprises: an adapter pool, wherein the adapter pool is located between an optical data unit (ODUk) layer and an optical channel (OCh) layer, and the adapter pool comprises one or more adapters which are respectively connected to an OCh layer link and an ODUK layer link; the information that the adapter pool used for managing comprises: information for indicating connectivity of the adapter with the OCh layer link and with the ODUk layer link, and information for indicating an adapter capability of the adapter. The adapting information between MRNs can be described more accurately through the present invention, and the correctness of the route calculation results is guaranteed.
    Type: Application
    Filed: April 21, 2010
    Publication date: June 7, 2012
    Applicant: ZTE Corporation
    Inventor: Gang Xie
  • Publication number: 20120140780
    Abstract: A communication system and method for a deep space spacecraft receiver to perform post-processing to dynamically combine received signal power coherently for pre-processed signal streams radiated non-coherently from a distributed, multiple element, Ka-band transmitting array via multiple concurrent propagation paths. Mutually orthogonal data and pilot signals travel though the multiple propagation paths. A pre-processor utilizing wavefront multiplexing restructures signal streams on the ground into multi-channel wavefrom structures along with injections of pilot signals for diagnostic and probing purposes. These restructured, or “wavefront multiplexed” (WFM) signals are transmitted through propagation channels to a receiver on the spacecraft, wherein adaptive equalization and wavefront de-multiplexing coherently separates the mixtures of received WFM signals.
    Type: Application
    Filed: February 6, 2012
    Publication date: June 7, 2012
    Inventor: DONALD C. D. CHANG
  • Publication number: 20120134671
    Abstract: A towed system for underwater electromagnetic prospecting for use with a seaward vessel is provided. The towed system comprises a first portion, a second portion, and a tow cable. The first portion is located on the vessel and includes a controller and a power supply system. The second towed portion is for submersion in the water and transmits an electromagnetic waveform and receives a corresponding electromagnetic signal. The tow cable connects the first portion with the second portion. The tow cable includes at least a pair of suitable conductors for delivering to the second portion a power signal generated by the first portion and at least one optical fibre for carrying data communications between the first portion and the second portion. The transmitted and received signals are digitized and this information is sent digitally to the controller in the first portion.
    Type: Application
    Filed: December 14, 2009
    Publication date: May 31, 2012
    Inventors: Nigel Edwards, Eleanor Willoughby, Reza Mir, Carsten Scholl
  • Publication number: 20120134670
    Abstract: A transmitting device includes a first optical transmitting medium, a second optical transmitting medium, and an optical multiplexing portion. The first optical transmitting medium outputs a first optical signal having a predetermined signal cycle. The second optical transmitting medium outputs a second optical signal obtained by delaying the first optical signal by one cycle of the predetermined signal cycle. The optical multiplexing portion is connected to an output side of the first optical transmitting medium and the second optical transmitting medium and generates a third optical signal obtained by multiplexing the first optical signal and the second optical signal.
    Type: Application
    Filed: May 19, 2011
    Publication date: May 31, 2012
    Applicant: FUJI XEROX CO., LTD.
    Inventor: Tsutomu HAMADA
  • Publication number: 20120123815
    Abstract: An optical network including a plurality of gateway nodes interconnected with a plurality of intermediate nodes with segments of fiber. The network includes a plurality of devices, such as reconfigurable optical add drop multiplexors, optimally placed at various nodes throughout the network. The device placement is optimized with an integer linear programming analysis considering span definition such that any given span involves some number of segments not exceeding a number of segments that would require wavelength regeneration, cost of placement of a device at a given node, cost of wavelength regeneration, and various parameters and constraints.
    Type: Application
    Filed: September 6, 2011
    Publication date: May 17, 2012
    Inventors: Benjamin K. Peterson, Laurel Clark
  • Patent number: 8180218
    Abstract: In a PON system in which communication is performed at a plurality of types of transmission rate (L, M, and H) in an upstream direction from a plurality of terminals connected to a station apparatus through optical fibers, within a discovery period for allowing an unregistered terminal to be recognized by station apparatus, the terminal makes a discovery response at one type of transmission rate (L). With this configuration, station apparatus can wait for a discovery response with a receive function being allowed to support transmission rate (L).
    Type: Grant
    Filed: February 19, 2007
    Date of Patent: May 15, 2012
    Assignee: Sumitomo Electric Industries, Ltd.
    Inventor: Hiroshi Murata
  • Patent number: 8165469
    Abstract: An optical add drop multiplexer (OADM) for use in a sensing system has the OADMs arranged either in a cascade or in a ring, with each OADM accepting a source input and generating a source output, and accepting a signal input and generating a signal output, where the source input includes a broadband optical source for use in providing optical power to a plurality of sensor gratings arranged in a series string, each sensor grating responsive to a physical parameter at a unique wavelength. The series string of sensors is excited by optical power coupled from the broadband source port, and returns optical signal response to a sensor port of the OADM, which optical energy is added to optical energy at the signal input port to form the signal output port. In another embodiment for a ring topology, the source ports and signal ports include a clockwise and counterclockwise set of source and sensor signals, and the sensor signals for CW and CCW each include a primary and secondary signal.
    Type: Grant
    Filed: January 20, 2009
    Date of Patent: April 24, 2012
    Assignee: Intelligent Fiber Optic Systems, Inc.
    Inventors: Behzad Moslehi, Richard J. Black, Vahid Sotoudeh
  • Publication number: 20120093510
    Abstract: An optical transmitter utilizing a multi-level data modulator to produce a PDM-QPSK signal, a one-bit delay interferometer configured to correlate the multi-level data modulated signal and an optical filter configured to combine the correlated multi-level data modulated signal with one or more neighboring signals prior to transmitting over one of a plurality of optical channels. The PDM-QPSK correlated signal is configured to reduce the signal spectrum thereby increasing spectral efficiency of the transmitted signal.
    Type: Application
    Filed: October 15, 2010
    Publication date: April 19, 2012
    Inventors: Hongbin Zhang, Yu Sun, Carl Davidson, Yi Cai
  • Publication number: 20120093513
    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: Application
    Filed: December 22, 2011
    Publication date: April 19, 2012
    Inventors: Yuanqiu LUO, Frank EFFENBERGER
  • Publication number: 20120087656
    Abstract: The present disclosure provides systems and methods for extending a deterministic network over a wide geographical area. According to one embodiment, an IED may transmit data frames using a deterministic frame-based communication protocol, such as EtherCAT, via a local deterministic fieldbus. A first transceiver may encapsulate the data frames for transmission over a multiplexing synchronized optical network, such as a SONET network. A second transceiver may de-encapsulate the encapsulated data frames and transmit them via a remote deterministic fieldbus, such that communication between the local and remote deterministic fieldbuses is deterministic. Accordingly, an IED may communicate with a high level of determinism and/or in real-time with various components in a power delivery system across a wide geographical area including multiple deterministic fieldbuses.
    Type: Application
    Filed: October 6, 2011
    Publication date: April 12, 2012
    Inventors: Michael E. Rourke, David J. Dolezilek, Max B. Ryan, Jerry J. Bennett