Patents Issued in February 18, 2014
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Patent number: 8654765Abstract: A network appliance that is part of a distributed virtual switch collects network flow information for network flows passing through the network appliance. The network flow information is encapsulated into packets as a data record for transport. Network flow exporter type information is added to the network flow records configured to indicate that the packets are from a distributed exporter. An option template is sent to the network flow data collectors that includes a device identifier that is configured to uniquely identify the network appliance. The packets are exported to the network flow data collector. The network flow data collector uses the network flow exporter type information and the device identifier to associate the network flow information with the distributed virtual switch.Type: GrantFiled: November 3, 2011Date of Patent: February 18, 2014Assignee: Cisco Technology, Inc.Inventors: Akshya Kumar Singh, Anuraag Mittal, Srinivas Sardar, Cesare Cantu
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Patent number: 8654766Abstract: An interconnection between fully synchronous networks and next-generation frame communications networks is disclosed. A means of bidirectional frame format conversion between a synchronous multiplexing system and a logical multiplexing system is provided, along with a method of transmitting data between different networks on a path as if it were being transmitted in the same network. Further, when converting network control information in an STM network into data suitable for a packet network, even across the boundary of a synchronous multiplexing system and a logical multiplexing system, a unified communication management means is provided over the whole path.Type: GrantFiled: May 7, 2012Date of Patent: February 18, 2014Assignee: Hitachi, Ltd.Inventors: Masahiko Mizutani, Yoshihiro Ashi, Masayuki Takase, Atsushi Iwamura, Akihiko Tanaka, Hideki Endo, Tohru Kazawa
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Patent number: 8654767Abstract: A method and system for audio transmission in a wireless communication system which transmits digital video and digital audio in High-Definition Multimedia Interface (HDMI) format. Position information of audio packets within the HDMI frame is obtained. Digital audio information including the position information is transmitted from a data source device to a data sink device via a wireless communication medium. At the data sink device, an HDMI frame is reconstructed by inserting received audio packets into horizontal and vertical blanking periods of the HDMI frame.Type: GrantFiled: November 29, 2012Date of Patent: February 18, 2014Assignee: Samsung Electronics Co., Ltd.Inventors: Huai-Rong Shao, Ju-Lan Hsu, Chiu Ngo
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Patent number: 8654768Abstract: In an example embodiment, there is described herein an apparatus comprising an upstream communication interface configured to receive a multicast stream from a source encoded by a first codec, a downstream communication interface, and routing and transcoding logic coupled to the upstream communication interface and downstream communication interface. The routing and transcoding logic is configured to forward the multicast stream encoded by the first codec unchanged to a first downstream subscriber of the multicast stream. The routing and transcoding logic is configured to replicate the multicast steam and transcode the multicast stream to a second codec for a second downstream subscriber, the replicated, transcoded multicast stream is forwarded to the second downstream subscriber.Type: GrantFiled: February 26, 2010Date of Patent: February 18, 2014Assignee: Cisco Technology, Inc.Inventor: Cheng-Jia Lai
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Patent number: 8654769Abstract: A method for convergence of multicast traffic in response to a topology change. The method includes, in response to a change in a multicast topology, redirecting multicast traffic through a network device of a plurality of network devices in the multicast topology and determining a querier status of the network device. The method also includes flooding the multicast traffic through an interface to the network device to facilitate convergence of the multicast traffic. The interface is a connecting point between the network device and another network device of the plurality of network devices.Type: GrantFiled: November 15, 2010Date of Patent: February 18, 2014Assignee: Hewlett-Packard Development Company, L.P.Inventors: Duane Edward Mentze, Suganya John Bosco Sesu Annamary, Beeram Suresh Kumar Reddy
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Patent number: 8654770Abstract: The present invention is directed to a method of setting up a call from an originating user in an internet protocol (IP) multimedia subsystem (IMS) network. The originating user provides a signalling message containing an originating identifier of the user to a first node of the network. According to the method, a first node of the network receives the signalling message. The first node performs a verification on whether the originating identifier is associated with a wildcard identifier, wherein the wildcard identifier identifies a plurality of identifiers which are entitled to using a group service. If the originating identifier is associated with a wildcard identifier, the first node forwards the wildcard identifier and the originating identifier to a further node for setting up the call.Type: GrantFiled: March 30, 2009Date of Patent: February 18, 2014Assignee: Telefonaktiebolaget L M Ericsson (Publ)Inventors: Hans-Erik Van Elburg, Germán Blanco
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Patent number: 8654771Abstract: What is disclosed is a wireless network control system configured to communicate with a wireless access node over a plurality of backhaul links. The wireless network control system includes a backhaul interface configured to monitor individual transmission delays for the backhaul links. The wireless network control system also includes a processing system configured to determine a data packet for transfer to the wireless access node and separate the data packet into a sequence of packet fragments. The processing system is also configured to select an individual one of the backhaul links for each of the packet fragments based on relative positions of the packet fragments in the sequence and based on the individual transmission delays of the backhaul links.Type: GrantFiled: February 3, 2010Date of Patent: February 18, 2014Assignee: Sprint Communications Company L.P.Inventors: Jasinder Pal Singh, Sachin R. Vargantwar, Deveshkumar Narendrapratap Rai, Maulik K. Shah
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Patent number: 8654772Abstract: A packet processing apparatus comprises a programmable hardware discriminator for receiving incoming packets, and selecting bits from any part of the incoming packets, a decision table for storing information relating to how the packets are to be processed, programmable hardware searching logic for accessing the information in the table according to the selected bits, and a packet handler for processing the packets according to the result of the access. Since many networking processing tasks can be broken down into bit selection and table searching, this generic type of arrangement will suit a wide variety of applications. It facilitates developing logic directly in hardware which can reduce the effort needed to convert a working prototype into a product ready for use in the field, e.g. for handling new protocol components.Type: GrantFiled: January 3, 2003Date of Patent: February 18, 2014Assignee: Avaya Inc.Inventor: Jamal Hadi Salim
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Patent number: 8654773Abstract: Systems and methods for coexistence of WLAN and Bluetooth networks are described. At least one embodiment includes a method for operating a wireless device in both a 802.11 network and a Bluetooth network. In accordance with some embodiments, the method comprises monitoring transmission of Synchronous Connection Oriented (SCO) slots over the Bluetooth network, informing an access point (AP) in the 802.11 network not to transmit to the device before the end of an SCO slot, transmitting a power save trigger to the AP to retrieve buffered data from the AP, and transmitting data to the AP.Type: GrantFiled: November 30, 2007Date of Patent: February 18, 2014Assignee: Conexant Systems, Inc.Inventors: Menzo Wentink, Doug Berger, Trent Carter
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Patent number: 8654774Abstract: Multi-rate link partners coupled via an Ethernet link may be configured to implement an asymmetric handshake wherein a change of rate in a first direction may be independent of delay that may occur when implementing a change of rate in a second direction. A rate change may be delayed based on a known time delay for configuring a link partner. A change in rate in the first direction may not be delayed by data transmissions in the second direction. Rate changes may be managed via physical layer control characters, physical layer out of band channel and/or packets generated from a layer above the physical layer. Control characters may be transmitted during inter-packet gaps and/or within a packet stream. Data rates may be transitioned from a full rate, intermediate rate or a rate of zero to a full data rate, intermediate rate or a rate of zero.Type: GrantFiled: October 2, 2008Date of Patent: February 18, 2014Assignee: Broadcom CorporationInventor: Wael William Diab
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Patent number: 8654775Abstract: In a wireless communication system, a multi-source data multiplexing system (e.g., a media access control (MAC)) accepts information packets from a plurality of signal sources, evaluates the relative efficiencies of data transmission, and transmits the information packets in provided grant regions for maximum efficiency. The multi-source data multiplexing system may accept any form of information packet from any form of signal source. The system receives a grant region, typically including a transmission time on a data channel, and inserts an information packet into the grant region. The actual information packet placed in the grant region may be one other than the packet for which the grant region was intended. Further, the multi-source data multiplexing system may fragment an information packet and transmit only a portion of the information packet in the grant region.Type: GrantFiled: March 21, 2011Date of Patent: February 18, 2014Assignee: Broadcom CorporationInventors: John Limb, Daniel Howard, Dolors Sala, Richard Protus
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Patent number: 8654776Abstract: A system and method is provided for scheduling transmissions from a plurality of services operating over a widely distributed communications network. A headend communications device (such as a cable modem termination system) arbitrates bandwidth among a plurality of cable modems configurable for bi-directional communications. The headend grants a bandwidth region to a specified cable modem or assigns contention regions for a group of cable modems. Each cable modem contains a local scheduler that sends requests for bandwidth according to local policies or rules. Upon receipt of a grant from the headend, the local scheduler selects packets to be transmitted to best serve the needs of the services associated with the cable modem. Accordingly, a service requesting bandwidth may not be the service utilizing the grant corresponding to bandwidth request. Nonetheless, the local scheduler manages bandwidth allocation among its local services such that all requesting services eventually receive bandwidth.Type: GrantFiled: May 5, 2011Date of Patent: February 18, 2014Assignee: Broadcom CorporationInventors: Dolors Sala, Ajay Chandra V. Gummalla, John O. Limb, Richard Protus
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Patent number: 8654777Abstract: A method and apparatus for adapting the switching process of a bridge to partition the bridge ports into a plurality of port subsets such that the bridge operates on each of the port subsets in an independent manner.Type: GrantFiled: March 31, 2005Date of Patent: February 18, 2014Assignee: Alcatel LucentInventors: Arie Johannes de Heer, Ronald de Man
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Patent number: 8654778Abstract: An information processing device, comprising: a traffic control unit configured to regularly check whether packets are transmitted to an adjacent node and received from the adjacent node; and a sleep determination process unit configured to determine whether there is a possibility that packets are transmitted to the adjacent node when no packet is transmitted to the adjacent node and received from to the adjacent node, and to transmit a sleep OK notice to the adjacent node indicating that the adjacent node shift to a sleep mode when the sleep determination process unit determines that there is a low probability that packets are transmitted to the adjacent node.Type: GrantFiled: June 22, 2010Date of Patent: February 18, 2014Assignee: Fujitsu LimitedInventors: Akiko Yamada, Satoshi Imai
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Patent number: 8654779Abstract: Methods and apparatus, including computer program products, implementing and using techniques for processing a data packet. An input port receives a data packet, a switching board classifies the data packet, determines whether the data packet should be accepted, and switches the data packet to a management board if the data packet is a first data packet in a session, and to a processing board if the data packet is not a first data packet in a session. A management board receives a data packet from the switching board, examines the data packet and forwards the data packet to one of the processing boards. One or more processing boards receives non-first data packets from the switching board and data packets from the management board and processes the data packets. A firewall and a secure gateway with firewall and virtual private network functionality for processing a data packet are also described.Type: GrantFiled: November 22, 2011Date of Patent: February 18, 2014Assignee: Juniper Networks, Inc.Inventors: Yan Ke, Yuming Mao, Jian Tong, Guangsong Huang
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Patent number: 8654780Abstract: Systems and methods for implementing and designing protocols in such communications systems which can be wireless or wired. The systems and methods can include fundamental changes in the traditional protocol design approaches with their constraints of one-to-one mapping in protocols. By doing so, embodiments of the present invention enable an efficient way to design and implement a system to support single or multiple protocols.Type: GrantFiled: March 29, 2012Date of Patent: February 18, 2014Assignee: AirHop Communications, Inc.Inventors: Hanson On, Yan Hui
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Patent number: 8654781Abstract: The invention discloses a method and apparatus for relay station downlink cooperative retransmission, wherein said method comprises: a relay station carrying out physical layer processing in advance on data which requires retransmitting according to different scenarios associated with different possible number of available wireless resources for retransmitting data in a retransmission subframe, generating corresponding OFDM signals, and monitoring the PCFICH of the retransmission subframe, and according to the monitoring result, selecting an OFDM signal which is corresponding to the determined number of available wireless resources from said OFDM signals to carry out retransmission transmitting.Type: GrantFiled: March 23, 2010Date of Patent: February 18, 2014Assignee: ZTE CorporationInventors: Feng Liang, Feng Bi, Ming Yuan, Jin Yang, Shuanshuan Wu
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Patent number: 8654782Abstract: A mesh tree formation system. In particular implementations, a method includes responsive to a selection of a channel potentially bearing a higher priority use, entering a silent state and initiating a channel scan of the selected channel for a period of time. The method also includes, responsive to receipt of an enabling signal, entering a limited transmission state that enables transmission of wireless frames on the selected channel. The method also includes, responsive to termination of the period of time of the channel scan wherein no higher priority use is detected, entering a full transmission state comprising transmission of enabling signals corresponding to the selected channel.Type: GrantFiled: November 5, 2007Date of Patent: February 18, 2014Assignee: Cisco Technology, Inc.Inventors: Christopher Graham Meil, Neal Dante Castagnoli, Jyoti Raju
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Patent number: 8654783Abstract: A method for channel switching comprising the steps: establishing (10) an active communication in a channel ch(m), checking (11) if the communication at an actual timeslot t(n) is successful, if checking (11) if the communication at the actual timeslot t(n) is successful, keeping the communication using the channel ch(m) for a next timeslot t(n+1) and repeating checking (11) if the communication at the actual timeslot t(n) is successful, if checking (11) if the communication at the actual timeslot t(n) is not successful, initiating a selection of a next channel ch(m+1). Further a device for communication is presented.Type: GrantFiled: March 25, 2010Date of Patent: February 18, 2014Assignee: AMS AGInventors: Mauro Afonso Perez, Nikolaus Ribic
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Patent number: 8654784Abstract: A network stack sends very large packets with large segment offload (LSO) by performing multi-pass LSO. A first-stage LSO filter is inserted between the network stack and the physical NIC. The first-stage filter splits very large LSO packets into LSO packets that are small enough for the NIC. The NIC then performs a second pass of LSO by splitting these sub-packets into standard MTU-sized networking packets for transmission on the network.Type: GrantFiled: March 11, 2010Date of Patent: February 18, 2014Assignee: Microsoft CorporationInventors: John A. Starks, Keith L. Mange
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Patent number: 8654785Abstract: Provided is a subscriber-side communication device including a subscriber-side processing unit that continuously performs signal processing regardless of computer restart and includes a transmission processing unit that performs a data transmission process according to transmission control information contained in a received signal from the office-side communication device.Type: GrantFiled: December 16, 2010Date of Patent: February 18, 2014Assignees: OF Networks Co., Ltd., Oki Electric Industry Co., Ltd., Fujikura Ltd.Inventors: Satoshi Furusawa, Akihiro Takahashi, Yasuyuki Kuroda, Shozo Yamada
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Patent number: 8654786Abstract: Certain aspects for the start-up procedure of transceivers supporting higher data rates over twisted-pair copper cabling are provided for 10 Gbit/sec Ethernet links (10GBASE-T). During a PMA (physical medium attachment) training period of the start-up procedure, long PMA training frames are exchanged periodically between link partners. A significant portion of each PMA training frame consists of known pseudo random sequences simultaneously transmitted over four wire pairs. PMA training frames include an InfoField for exchanging parameters and control information between link partners. For example, the InfoField's payload comprises fields for indicating current transmit power backoff (PBO), next PBO, requested PBO, transition count, control information, and for communicating precoder coefficients. Information in InfoFields is repeated and is not necessary that a link partner decodes every InfoField.Type: GrantFiled: May 6, 2013Date of Patent: February 18, 2014Assignee: Broadcom CorporationInventors: Gottfried Ungerboeck, Scott Powell
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Patent number: 8654787Abstract: A communication apparatus for remote communication may include a local communication proxy module configured to receive streams from a local communication application module. The streams may be in a form utilizing a first transmission protocol and destined to a remote destination. The local communication proxy module may be configured to add first header information including one or more of the following: a packet sequence identifier, a packet size, a packet type identifier, and additional information related to a packet type identifier. The local communication proxy module may be configured to add second header information. The local communication proxy module may be also configured to form packets and to facilitate sending, utilizing a second transmission protocol, the packets in real-time over a network to a remote communication proxy module. A machine-readable medium and a method are also disclosed.Type: GrantFiled: June 12, 2009Date of Patent: February 18, 2014Assignee: Dell Products L.P.Inventors: Daniel Ernesto Barreto, Siddhartha Kasivajhula, Ankur Kumar
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Patent number: 8654788Abstract: A method and apparatus for providing a method to enable subscribers of broadband access services, such as Digital Subscriber Loop based or Cable based broadband access services, to dynamically reconfigure their access arrangements as a function of the bandwidth usage of subscribers are disclosed. The present invention provides a method for broadband service providers to dynamically adjust access bandwidth allocation for subscribers by monitoring access bandwidth usage by subscribers and dynamically adjust the needed access bandwidth for the subscribers accordingly.Type: GrantFiled: November 2, 2010Date of Patent: February 18, 2014Assignee: AT&T Intellectual Property II, L.P.Inventors: Marian Croak, Hossein Eslambolchi
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Patent number: 8654789Abstract: A method begins by a processing module generating a payload of a dispersed storage network (DSN) frame regarding an intermediate write request operation by generating one or more transaction number fields of the payload to include one or more transaction numbers corresponding to a write request operation, wherein the intermediate write request operation is associated with the write request operation. The method continues with the processing module generating a protocol header of the DSN frame by generating a payload length field of the protocol header to include a payload length that represents a length of the one or more transaction number fields and generating remaining fields of the protocol header.Type: GrantFiled: April 5, 2011Date of Patent: February 18, 2014Assignee: Cleversafe, Inc.Inventors: Andrew Baptist, Wesley Leggette, Jason K. Resch, Manish Motwani
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Patent number: 8654790Abstract: A test device includes a packet input receiver for receiving encapsulated packets from a network; a packet reader for extracting timing information from the encapsulated packets, and for decapsulating encapsulated packets so as to obtain test packets; a FIFO queue for storing the test packets; a packet controller for reading the test packets from the FIFO queue and writing the test packets into a de-jitter buffer in accordance with the timing information, the de-jitter buffer for storing the reordered test packets; and, a packet output generator for providing the test packets to a target device wherein time intervals between the test packets are reproduced using the timing information.Type: GrantFiled: May 13, 2011Date of Patent: February 18, 2014Assignee: JDS Uniphase CorporationInventors: Joe Haver, Takashi Hidai, Sam Bauer, Canning Hsueh
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Patent number: 8654791Abstract: Described herein is a method and system for distributing whole and fragmented requests and responses across a multi-core system. Each core executes a packet engine that further processes data packets and data packet fragments allocated to that core. A flow distributor executing within the multi-core system forwards client requests to a packet engine on a core that is selected based on a value generated when a hash is applied to a tuple comprising a client IP address, a client port, a server IP address and a server port identified in the request. The packet engine maintains each element of the tuple and forwards the request to the selected core. The packet engine can also process data packet fragments by assembling the fragments prior to transmitting them to the selected core, or by transmitting the data packet fragments to the selected core.Type: GrantFiled: July 25, 2011Date of Patent: February 18, 2014Assignee: Citrix Systems, Inc.Inventors: Sandhya Gopinath, Henk Bots, Ramanjaneyulu Y. Talla, Abhishek Chauhan
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Patent number: 8654792Abstract: More customization and adaptation of coded data streams may be achieved by processing the information signal such that the various syntax structures obtained by pre-coding the information signal are placed into logical data packets, each of which being associated with a specific data packet type of a predetermined set of data packet types, and by defining a predetermined order of data packet types within one access unit of data packets. The consecutive access units in the data stream may, for example, correspond to different time portions of the information signal. By defining the predetermined order among the data packet types it is possible, at decoder's side, to detect the borders between successive access units even when removable data packets are removed from the data stream on the way from the data stream source to the decoder without incorporation of any hints into the reminder of the data stream.Type: GrantFiled: June 1, 2012Date of Patent: February 18, 2014Assignee: Fraunhofer-Gesellschaft zur Foerderung der angewandten Forschung e.V.Inventor: Thomas Wiegand
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Patent number: 8654793Abstract: Network devices and methods are provided for sharing multimedia data with other network devices existing on a network, in which a network device shares and uses multimedia data with other network devices, collects information about multimedia data contained in the other network devices and requests the transmission of multimedia data from a network device containing the multimedia data based on the collected information at the request of a user. The network device may include a network device management unit for collecting information about multimedia data; a multimedia data management unit for preparing a multimedia data list; a packet generation/processing unit for generating a packet requesting multimedia data; and a transmission unit for transmitting the generated packet to a specific network device.Type: GrantFiled: August 30, 2006Date of Patent: February 18, 2014Assignee: Samsung Electronics Co., Ltd.Inventors: Dae-hak Rim, Kwang-yun Na, Eun-hee Rhim
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Patent number: 8654794Abstract: A radio communication method in a radio communication system in which data signals for a first and second user are respectively transmitted using first and second subcarrier groups, and pilot signals for the first and second users are multiplexed using time-division multiplexing with the data signals for those users, including arranging a pilot signal of the first user at frequencies different from frequencies of a pilot signal of the second user and mapping subcarrier components of the pilot signals so that one of subcarrier components of higher frequencies corresponds to one of subcarrier components of lower frequencies, wherein the pilot signals are generated using a Zadoff-Chu sequence.Type: GrantFiled: July 16, 2012Date of Patent: February 18, 2014Assignee: Fujitsu LimitedInventors: Tsuyoshi Shimomura, Dai Kimura
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Patent number: 8654795Abstract: A packet data transmitting method for packet service domain is disclosed. After receiving a Service Data Unit (SDU), a Packet Data Convergence Protocol (PDCP) entity determines how to handle the SDU in a cache queue and process a Protocol Data Unit (PDU) record in a Serial Number (SN) window based on whether or not the cache queue includes any SDU and the SN window is full, respectively. When both the cache queue and the SN window are full, the PDCP entity processes PDU records in the SN window according to their respective weight values and processes an SDU in the cache queue into a new PDU accordingly. A packet data transmitting system for packet service domain is also disclosed, which can prolong the time window for confirming a PDU record in the SN window.Type: GrantFiled: April 22, 2010Date of Patent: February 18, 2014Assignee: ZTE CorporationInventor: Xuehong Shi
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Patent number: 8654796Abstract: A system for synchronizing clock, which is used to realize the synchronization between a radio frequency module and a base band module in a base station, comprises: one or more time generators, located on the radio frequency module side, configured to generate a synchronous signal according to an external clock signal, and to send the synchronous signal to a time distributor; the time distributor, located on the base band module side, configured to generate a synchronous clock according to a synchronous signal from one of the one or more time generators, and to adjust the synchronous clock according to a communication delay between the time generator which outputs the synchronous signal and the time distributor, and to send the synchronous clock adjusted to the radio frequency module and the base band module to realize the synchronization between the radio frequency module and the base band module.Type: GrantFiled: August 31, 2010Date of Patent: February 18, 2014Assignee: ZTE CorporationInventors: Jiying Xiang, Zongan Li
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Patent number: 8654797Abstract: To provide a data relay device which prevents a significant delay even when pieces of data are transmitted/received in protocols that are different from each other. Transmission timings at which pieces of data are transmitted/received in a network using an event trigger type communication protocol are estimated. Stay periods which occur when pieces of data are relayed and transmitted at predetermined transmission timings in a network using a time trigger type communication protocol are calculated while changing a reference time for the time trigger type communication protocol. Then, synchronization processing is performed in the network using the time trigger type communication protocol such that communication is performed using a reference time having a small stay period that has been calculated.Type: GrantFiled: April 8, 2009Date of Patent: February 18, 2014Assignee: Toyota Jidosha Kabushiki KaishaInventors: Hiroya Ando, Osamu Hirashima, Yusuke Satoh, Katsutomo Sasakura
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Patent number: 8654798Abstract: A barrier synchronization apparatus includes a receiving device which transmits a first synchronization signal to a synchronization device when the first synchronization signal in which a transmission destination is set in advance according to setting conditions including an algorithm of the barrier synchronization and an execution condition is received. A synchronization device synchronizes n first synchronization signals which are set in advance according to the setting conditions, wherein n is a positive integer, and designates transmission of m second synchronization signals in which transmission destinations are set in advance according to the setting conditions after the synchronization is established, wherein m is a positive integer. A transmitting device transmits the second synchronization signals to m transmission destinations set in advance, when a transmission designation information indicating the transmission designation is received from the synchronization device.Type: GrantFiled: October 20, 2009Date of Patent: February 18, 2014Assignee: Fujitsu LimitedInventors: Shinya Hiramoto, Yuichiro Ajima, Tomohiro Inoue
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Patent number: 8654799Abstract: A mode-locked fiber laser has a resonator including a gain-fiber, a mode-locking element, and a spectrally-selective dispersion compensating device. The resonator can be a standing-wave resonator or a traveling-wave resonator. The dispersion compensating device includes only one diffraction grating combined with a lens and a minor to provide a spatial spectral spread. The numerical aperture of the gain-fiber selects which portion of the spectral spread can oscillate in the resonator.Type: GrantFiled: December 14, 2010Date of Patent: February 18, 2014Assignee: Coherent, Inc.Inventors: Dmitri Simanovski, Andrei Starodoumov
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Patent number: 8654800Abstract: A high power fiber laser is configured with a multimode active fiber and input and output single mode passive fibers butt-spliced to respective opposite ends of the active fiber. If the input passive and active fibers do not have substantially matched diameters, a SM radiation coupled into the active fiber may excite fundamental and high order modes which, while interfering with one another, create a non-uniform distribution of refractive index in each of forward and backward light propagation directions along the resonator of the laser. The variable longitudinal perturbation components of the refractive index in respective forward and backward directions along an optical path in the active fiber are distributed in accordance with respective cosine functions.Type: GrantFiled: May 3, 2011Date of Patent: February 18, 2014Assignee: IPG Photonics CorporationInventors: Roman Yagodkin, Nikolai Platanov, Mikhail Meleshkevich
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Patent number: 8654801Abstract: In aspects of the invention, wavelength conversion element has a harmonic generation portion and a parametric oscillation portion. The harmonic generation portion generates a harmonic of laser light output from a laser light source. The parametric oscillation portion generates signal light and idler light from the harmonic generated by the harmonic generation portion. In some aspects of the invention, electrodes and a first voltage control portion control the intensity of the harmonic generated by the harmonic generation portion. A first FBG (Fiber Bragg Grating) and a second FBG cause resonance of signal light output from the parametric oscillation portion. A piezo tube and a second voltage control portion change the resonance frequency of the first FBG and the second FBG.Type: GrantFiled: April 12, 2013Date of Patent: February 18, 2014Assignee: Fuji Electric Co., Ltd.Inventor: Masanori Oto
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Patent number: 8654802Abstract: A vertical-cavity surface-emitting laser array includes a substrate having an element forming area, multiple columnar structures formed in the element forming area on the substrate, and at least one metal wire formed adjacent to the multiple columnar structures. Each columnar structure includes a lower semiconductor reflector of a first conductivity type, an upper semiconductor reflector of a second conductivity type, and an active region formed between the lower semiconductor reflector and the upper semiconductor reflector. The columnar structure emits light in a direction perpendicular to the substrate. The at least one metal wire has a distortion applying segment that extends in the same direction relative to the multiple columnar structures.Type: GrantFiled: February 7, 2012Date of Patent: February 18, 2014Assignee: Fuji Xerox Co., Ltd.Inventor: Masaya Kumei
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Patent number: 8654803Abstract: A light emitting device includes a semiconductor laser, which oscillates in a single longitudinal mode, formed above a semiconductor substrate, a first heater, which controls a temperature of the semiconductor laser, provided near the semiconductor laser, a gain unit, which amplifies a beam outputted from the semiconductor laser and outputs an amplified beam, formed above the semiconductor substrate, a second heater, which controls a temperature of the gain unit, provided near the gain unit, and a second harmonic generation element, which converts the amplified beam outputted from the gain unit to a second harmonic light and outputs the second harmonic light.Type: GrantFiled: October 8, 2012Date of Patent: February 18, 2014Assignee: Fujitsu LimitedInventor: Akinori Hayakawa
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Patent number: 8654804Abstract: An optical transmitter is disclosed, where the optical transmitter shows an emission wavelength kept stable in one of grid wavelengths of the WDM system during the boot of the transmitter. The optical transmitter includes an LD, a TEC to control a temperature of the LD, and a controller. Detecting the flag to enable the optical output, the controller increases the driving current of the LD concurrently with the decrease of the temperature of the TEC to compensate the self-heating of the LD due to the driving current.Type: GrantFiled: August 13, 2012Date of Patent: February 18, 2014Assignee: Sumitomo Electric Industries, Ltd.Inventor: Shogo Amari
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Patent number: 8654805Abstract: Radio-frequency (RF) power supply apparatus for supplying RF power to discharge electrodes of a gas-discharge laser includes a plurality of amplifier modules each having an RF output. A power combining arrangement is provided for combining the amplifier module RF-outputs into a single combined RF-output connected to the discharge electrodes. A DC power supply is connectable to or disconnectable from each of the transistor amplifier modules, separately, to allow current drawn by any of the amplifier modules to be monitored by a single current sensor.Type: GrantFiled: August 23, 2011Date of Patent: February 18, 2014Assignee: Coherent, Inc.Inventors: David P. Schmelzer, Frederick W. Hauer
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Patent number: 8654806Abstract: A first device is provided. The device includes an organic semiconductor laser. The organic semiconductor laser further includes an optical cavity and an organic layer disposed within the optical cavity. The organic layer includes: an organic host compound; an organic emitting compound capable of fluorescent emission; and an organic dopant compound. The organic dopant compound may also be referred to herein as a “triplet manager.” The triplet energy of the organic dopant compound is lower than or equal to the triplet energy of the organic host compound. The triplet energy of the organic dopant compound is lower than or equal to the triplet energy of the organic emitting compound. The singlet energy of the organic emitting compound is lower than or equal to the singlet energy of the organic host compound.Type: GrantFiled: April 13, 2012Date of Patent: February 18, 2014Assignee: The Regents of the University of MichiganInventors: Stephen R. Forrest, Yifan Zhang
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Patent number: 8654807Abstract: An electrical device includes a charge carrier transport layer formed using a ternary semiconducting compound having a stoichiometry of 1:1:1 and an element combination selected from the set of I-II-V, I-III-IV, II-II-IV, and I-I-VI; or having a stoichiometry of 3:1:2 and an element combination selected from the set of I-III-V; or having a stoichiometry of 2:1:1 and an element combination selected from the set of I-II-IV. In some embodiments, the charge carrier transport layer is used as the radiation absorption layer for a photovoltaic cell, or a light emitting layer of a light emitting device. Other devices, such as laser diode, a photodetection device, an optical modulator, a transparent electrode and a window layer, can also be formed using the ternary semiconducting compound as the charge carrier transport.Type: GrantFiled: November 17, 2011Date of Patent: February 18, 2014Assignee: The Board of Trustees of the Leland Stanford Junior UniversityInventors: Claudia Felser, Shoucheng Zhang, Xiao Zhang
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Patent number: 8654808Abstract: A nitride semiconductor laser element has: a nitride semiconductor layer having cavity planes at the ends of a waveguide region, an insulating film formed on an upper face of the nitride semiconductor layer so that the ends on the cavity plane side are isolated from cavity planes, and a first film formed from the cavity plane to the upper face of the nitride semiconductor layer, and covered part of the insulating film surface, the first film has a first region that is in contact with the nitride semiconductor and a second region that is in contact with the insulating film, and is formed from AlxGa1-xN (0<x?1) and a different material from that of the insulating film.Type: GrantFiled: July 29, 2011Date of Patent: February 18, 2014Assignee: Nichia CorporationInventor: Tomonori Morizumi
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Patent number: 8654809Abstract: A quantum cascade laser is configured to include a semiconductor substrate and an active layer which is provided on the substrate and has a cascade structure formed by multistage-laminating unit laminate structures 16 each including an emission layer 17 and an injection layer 18. The unit laminate structure 16 has, in its subband level structure, a first emission upper level Lup1, a second emission upper level Lup2 of an energy higher than the first emission upper level, an emission lower level Llow, and a relaxation level Lr of an energy lower than the emission lower level, light is generated by intersubband transitions of electrons from the first and second upper levels to the lower level, and electrons after the intersubband transitions are relaxed from the lower level to the relaxation level and injected from the injection layer 18 into an emission layer 17b of a subsequent stage via the relaxation level.Type: GrantFiled: May 18, 2010Date of Patent: February 18, 2014Assignee: Hamamatsu Photonics K.K.Inventors: Kazuue Fujita, Masamichi Yamanishi, Tadataka Edamura, Naota Akikusa
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Patent number: 8654810Abstract: A light-emitting device formed by easily mounting a light-emitting element onto a supporting base and a method of manufacturing the light-emitting device are provided. A light-emitting device includes: a supporting base including a depression section on a top surface thereof, the depression section having an inclined surface on a side wall thereof; a first light-emitting element arranged on a bottom surface of the depression section; and a second light-emitting element arranged on the first light-emitting element and the supporting base.Type: GrantFiled: February 17, 2010Date of Patent: February 18, 2014Assignee: Sony CorporationInventors: Hiroyuki Fukasawa, Yuichi Hamaguchi, Takeharu Asano, Keigo Aga, Noriyuki Banno
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Patent number: 8654811Abstract: Vertical Cavity Surface Emitting Laser (VCSEL) arrays with vias for electrical connection are disclosed. A Vertical Cavity Surface Emitting Laser (VCSEL) array in accordance with one or more embodiments of the present invention comprises a plurality of first mirrors, a plurality of second mirrors, a plurality of active regions, coupled between the plurality of first mirrors and the plurality of second mirrors, and a heatsink, thermally and mechanically coupled to the second mirror opposite the plurality of active regions, wherein an electrical path to at least one of the plurality of second mirrors is made through a via formed through a depth of the plurality of second mirrors, and a plurality of VCSELs in the VCSEL array are connected in series.Type: GrantFiled: August 25, 2010Date of Patent: February 18, 2014Assignee: Flir Systems, Inc.Inventors: Jonathan C. Geske, Chad Shin-deh Wang, Michael MacDougal
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Q-switched grating vertical-cavity surface-emitting laser system and method for fabricating the same
Patent number: 8654812Abstract: A vertical cavity surface emitting laser (VCSEL) system and method of fabrication are included. The VCSEL system includes a gain region to amplify an optical signal in response to a data signal and a first mirror arranged as a partially-reflective high-contrast grating (HCG) mirror at an optical output of the VCSEL system. The VCSEL system also includes a second mirror. The first and second mirrors can be arranged as a laser cavity to resonate the optical signal. The VCSEL system further includes a doped semiconductor region to generate a current through the first mirror in response to a voltage signal to substantially alter the reflectivity of the first mirror to provide Q-switching capability of the VCSEL system.Type: GrantFiled: January 25, 2011Date of Patent: February 18, 2014Assignee: Hewlett-Packard Development Company, L.P.Inventors: David A. Fattal, Michael Renne Ty Tan, Raymond G. Beausoleil -
Patent number: 8654813Abstract: The invention relates to a safety device (1) for detecting electrode breakage in an electric arc furnace, wherein an electrode (6) is secured on an electrode support arm (4), and wherein a conduit is filled with a medium under a constant pressure and a pressure drop is produced at an electrode breakage, which is detected as an alarm signal. Here, the conduit (7a-d,3) is integrated in a protective component that is arranged beneath the electrode support arm (4) thereon, wherein in case of an electrode breakage, the conduit (7a-d,3) is damaged by a produce electric arc and the pressure drop takes place.Type: GrantFiled: December 16, 2005Date of Patent: February 18, 2014Assignee: SMS Demag AGInventor: Manfred Schubert
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Patent number: 8654814Abstract: A method for identifying the presence of an electronic transmission comprising detecting, by a detecting device, the presence of a burst of electromagnetic energy that results from the presence of an original carrier signal and transmitting, by a transmitting device, a spread spectrum meta-carrier signal within a portion of a bandwidth of the original carrier signal, wherein the meta-carrier signal contains information about the original carrier signal and is transmitted such that the meta-carrier signal occupies at least a portion of a bandwidth of the original carrier signal during the presence of the burst of electromagnetic energy.Type: GrantFiled: March 9, 2011Date of Patent: February 18, 2014Assignee: Comtech EF Data Corp.Inventors: Michael Beeler, Cris M. Mamaril, Jeffery Harig