Patents by Inventor Takao Naito

Takao Naito has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Patent number: 8041230
    Abstract: A method for upgrading an optoelectrical system includes securing a transmitter to a line card, wherein the line card comprises an optoelectrical connector. It also includes coupling the transmitter to the connector, wherein the connector comprises an embedded fiber configured to be coupled to the transmitter. In addition, the method includes inserting a pluggable form factor module comprising a receiver, an input port, and an output port into a cage secured to the line card. Further, the method includes coupling the pluggable form factor module to the connector such that an optical signal transmitted by the transmitter propagates in an optical line of sight between the embedded fiber of the connector and the output port. The connector comprises electrical contacts that are configured to be coupled to the module such that the receiver can convert optical signals received at the input port into electrical signals and transmit the electrical signals to the line card via the connector.
    Type: Grant
    Filed: December 12, 2008
    Date of Patent: October 18, 2011
    Assignee: Fujitsu Limited
    Inventors: Alexander Umnov, Dung Q. Tran, Takao Naito
  • Publication number: 20110243030
    Abstract: Systems and methods for determining multiple paths in a multi-domain network are provided. In some embodiment, a method for determining multiple paths in a network is provided. The method may include determining a first path between a source node and a destination node and determining a second path disjoint from the first path. In some embodiments, to determine the second path includes determining which ingress nodes are available in a domain that includes the destination node, where the available ingress nodes are not part of the first path, and implementing a disjoint path algorithm for each of the available ingress nodes. To determine the first path includes implementing forward path calculations.
    Type: Application
    Filed: March 31, 2010
    Publication date: October 6, 2011
    Applicant: FUJITSU LIMITED
    Inventors: Qiong Zhang, Mohammad Masud Hasan, Xi Wang, Paparao Palacharla, Takao Naito, Fredrick S. Gruman
  • Publication number: 20110242995
    Abstract: Systems and methods for multi-domain routing are provided. In some embodiments, a method for determining a path calculation from a source node to a destination node over a multi-domain network is provided. The method may include steps for receiving a predetermined sequence of domains for communicating information from the source node to the destination node, determining a link type for each of a plurality of links in the predetermined sequence of domains, modifying the link type of one or more of the plurality of links such that the plurality of links are unidirectional links towards a destination node, and determining a path along the predetermined sequence of domains based on the modified plurality of links.
    Type: Application
    Filed: March 31, 2010
    Publication date: October 6, 2011
    Applicant: FUJITSU LIMITED
    Inventors: Qiong Zhang, Mohammad Masud Hasan, Xi Wang, Paparao Palacharla, Takao Naito, Fredrick S. Gruman
  • Publication number: 20110238954
    Abstract: Source code to be processed is analyzed and configuration data in implementing in accordance with each of plural implementation systems is created and is stored in a local memory of a DRP incorporating system. When execution of target processing is started, the implementation system determination processing calculates estimated processing time when the configuration of each of the implementation systems is adopted and determines the optimum one of the implementation systems based on a combination of the estimated processing time and the circuit scale of the configuration.
    Type: Application
    Filed: August 26, 2010
    Publication date: September 29, 2011
    Applicant: FUJI XEROX CO., LTD.
    Inventors: Takao NAITO, Kazuo YAMADA
  • Publication number: 20110223960
    Abstract: A method for adjusting power distribution that includes establishing a connection between a base station and a plurality of remote transceivers. The method also includes establishing a plurality of wireless connections with a plurality of endpoints via one or more of the plurality of remote transceivers. The method further includes receiving a signal quality indication from each of the plurality of remote transceivers for any endpoint for which the remote transceiver is able to receive a wireless communication. The method additionally includes determining a power distribution for the plurality of remote transceivers based on the received signal quality indication from each of the remote transceivers. The method also includes transmitting a control signal to the plurality of remote transceivers. The control signal comprises the power distribution and is indicative of the amount of power each remote transceiver is to use for each endpoint when transmitting wireless communications.
    Type: Application
    Filed: October 21, 2010
    Publication date: September 15, 2011
    Applicant: Fujitsu Limited
    Inventors: Wei-Peng Chen, Chenxi Zhu, Takao Naito
  • Publication number: 20110225415
    Abstract: A data processing apparatus includes a reconfigurable circuit capable of reconfigurating partially a circuit configuration: and a reconfiguration controlling unit that controls a reconfiguration of the circuit configuration of the reconfigurable circuit. The reconfiguration controlling unit reconfigurates a plurality of partial circuits, which constitute one pipeline and are reconfigurated simultaneously on the reconfigurable circuit, on the reconfigurable circuit in sequence from a head partial circuit of the pipeline, and starts sequentially the reconfigurated partial circuits from a head.
    Type: Application
    Filed: September 27, 2010
    Publication date: September 15, 2011
    Applicant: FUJI XEROX CO., LTD.
    Inventors: Kazuo YAMADA, Takao NAITO
  • Publication number: 20110223961
    Abstract: In accordance with particular embodiments, a method for adjusting power distribution includes establishing a connection between a base station and a plurality of remote transceivers. The method also includes establishing a plurality of wireless connections with a plurality of endpoints via one or more of the plurality of remote transceivers. The method further includes determining a plurality of signal quality indications. Each signal quality indication is associated with a different one of a plurality of unique endpoint-remote transceiver pairs. The method additionally includes determining a power distribution for the plurality of remote transceivers based on the plurality of signal quality indications and an optimization equation. The optimization equation is configured to optimize a data throughput associated with the plurality of wireless connections by determining a power gain for each of the wireless connections.
    Type: Application
    Filed: November 30, 2010
    Publication date: September 15, 2011
    Applicant: Fujitsu Limited
    Inventors: Wei-Peng Chen, Chenxi Zhu, Takao Naito
  • Publication number: 20110223958
    Abstract: A method for adjusting power distribution includes establishing a connection between a base station and a plurality of remote transceivers. The method also includes establishing a plurality of wireless connections with a plurality of endpoints via one or more of the plurality of remote transceivers. The method further includes determining a signal quality indication for each of the plurality of remote transceivers for any endpoint for which the remote transceiver is able to receive a wireless communication. The method also includes determining a power distribution for the plurality of remote transceivers based on the determined signal quality indication for each of the remote transceivers, the power distribution indicative of the amount of power each remote transceiver is to use for each endpoint when transmitting wireless communications.
    Type: Application
    Filed: September 10, 2010
    Publication date: September 15, 2011
    Applicant: Fujitsu Limited
    Inventors: Wei-Peng Chen, Chenxi Zhu, Takao Naito
  • Publication number: 20110206374
    Abstract: In accordance with embodiments of the present disclosure, a method for demand aggregation is provided. The method may include routing demands in a ring network such that a length for each routed demand does not exceed a route length maximum, and a load imbalance at each node in the ring network is minimized. The method may also include maximizing optical line card sharing by assigning routed demands sharing common ends to the same wavelength.
    Type: Application
    Filed: February 7, 2011
    Publication date: August 25, 2011
    Inventors: Xi Wang, Qiong Zhang, Paparao Palacharla, Takao Naito
  • Publication number: 20110176813
    Abstract: A system is provided for electrical domain optical spectrum shaping. The system may include a laser, a modulator, a first electrical filter, and a second electrical filter. The laser may be configured to output an optical carrier signal. The modulator may be configured to modulate the optical carrier signal to output a modulated optical signal based on a first filtered input signal and a second filtered input signal received by the modulator. The first electrical filter may be configured to filter a first input signal to produce the first filtered input signal. The second electrical filter may be configured to filter a second input signal to produce the second filtered input signal.
    Type: Application
    Filed: January 20, 2010
    Publication date: July 21, 2011
    Inventors: Inwoong Kim, Paparao Palacharla, Takao Naito
  • Publication number: 20110167183
    Abstract: In certain embodiments, minimizing interconnections in a multi-shelf switching system includes receiving a map describing the switching system, where the switching system comprises shelves and input/output (I/O) points. The map is transformed to yield a graph comprising nodes and edges. A node represents an I/O point, and a node weight represents a number of interface cards of the I/O point represented by the node. An edge between a node pair represents traffic demand between the I/O points represented by the node pair, and an edge weight represents the amount of the traffic demand represented by the edge. The graph is partitioned to yield a groups that minimize interconnection traffic among the shelves, where each group represents a shelf of the multi-shelf switching system.
    Type: Application
    Filed: January 7, 2010
    Publication date: July 7, 2011
    Applicant: Fujitsu Limited
    Inventors: Qiong Zhang, Paparao Palacharla, Xi Wang, Takao Naito
  • Publication number: 20110150479
    Abstract: An apparatus for use with an optical computation system may comprise a monolithic device with no free space optical components and may include a phase modulator and a polarization modulator. The phase modulator may be configured to receive a beam of light and two digital data streams and operable to modulate the phase of the beam of light to at least four phase states, the at least four phase states representing the two digital data streams. The polarization modulator may be configured to receive two additional digital data streams and the modulated beam of light from the phase modulator and operable to modulate the polarization of the beam of light to at least four polarization states, the at least four polarization states representing the two additional digital data streams.
    Type: Application
    Filed: December 23, 2009
    Publication date: June 23, 2011
    Applicant: FUJITSU LIMITED
    Inventors: Inwoong Kim, Takao Naito
  • Patent number: 7949256
    Abstract: A method is provided for increasing downstream bandwidth in an optical network that includes providing a downstream terminal comprising a digital output path and an analog output path. The method also includes receiving a signal comprising at least one wavelength at the downstream terminal. The method further includes selectively processing the signal at the downstream terminal. The signal is selectively processed at the downstream terminal by processing the signal on the analog output path if the signal comprises analog video data and processing the signal on the digital output path if the signal comprises data to be converted to a digital bit stream.
    Type: Grant
    Filed: January 5, 2007
    Date of Patent: May 24, 2011
    Assignee: Fujitsu Limited
    Inventors: Martin Bouda, Takao Naito
  • Publication number: 20110103791
    Abstract: A method is provided for dispersion compensation of an optical signal communicated in an optical network. The method may include receiving an optical signal comprising a plurality of channels. The method may further include filtering at least one channel from the plurality of channels. The method may also include analyzing the at least one channel of the plurality of channels to measure optical dispersion in the at least one channel. The method may additionally include compensating for optical dispersion based on the measured dispersion.
    Type: Application
    Filed: November 3, 2009
    Publication date: May 5, 2011
    Applicant: Fujitsu Limited
    Inventors: Alexander Umnov, Takao Naito, Niranjan Hanumanna
  • Publication number: 20110103529
    Abstract: According to particular embodiments, a signal communicated from a transmitter to a receiver is received. A frequency offset estimate of the signal is determined. The frequency offset estimate indicates a frequency difference between the transmitter and the receiver. The frequency offset estimate is provided as feedback. A next frequency offset is compensated for according to the feedback.
    Type: Application
    Filed: October 30, 2009
    Publication date: May 5, 2011
    Applicant: Fujitsu Limited
    Inventors: Inwoong Kim, Takao Naito
  • Patent number: 7936749
    Abstract: A node device receives supervisory control information on a dedicated wavelength different from a wavelength of signal light, which is input from an input port together with the signal light, and extracts, from signal light to be output from an output port, information superposed on an optical main signal of the signal light. Then, it is confirmed whether or not the signal light to be output and the supervisory control information correspond by using the extracted information, and supervisory control information corresponding to the signal light to be output is transmitted on the dedicated wavelength from the output port.
    Type: Grant
    Filed: October 26, 2005
    Date of Patent: May 3, 2011
    Assignee: Fujitsu Limited
    Inventors: Toru Katagiri, Takao Naito
  • Publication number: 20110080846
    Abstract: According to particular embodiments, determining paths in a network with asymmetric switches includes receiving a graph representing the network. Each asymmetric switch has defined degree connectivity between one or more pairs of degrees of the asymmetric switch. The graph is transformed to yield a transformed graph that accounts for the asymmetric switches. A routing process is applied to the transformed graph to yield one or more paths through the network.
    Type: Application
    Filed: October 7, 2009
    Publication date: April 7, 2011
    Applicant: Fujitsu Network Communications, Inc.
    Inventors: Min He, Kevin Zhu, Srinivas Vobilisetti, Takao Naito, Paparao Palacharla, Xi Wang, Qiong Zhang
  • Patent number: 7920792
    Abstract: In accordance with the teachings of the present invention, a system and method for managing communication in a hybrid passive optical network (HPON) is provided. In a particular embodiment, the method includes transmitting, at a first wavelength, a first configuration message on the HPON. The method also includes receiving at one or more of a plurality of receivers at an optical line terminal (OLT) one or more configuration response messages from one or more optical network units (ONUs) in a first set of ONUs. The method further includes, based on the configuration response messages from the first set of ONUs, associating, in a database, each ONU in the first set of ONUs with the first wavelength and with the receiver receiving the configuration response message from the ONU. The method also includes, after transmitting the first configuration message, transmitting, at a second wavelength, a second configuration message on the HPON.
    Type: Grant
    Filed: May 2, 2007
    Date of Patent: April 5, 2011
    Assignee: Fujitsu Limited
    Inventors: Paparao Palacharla, Martin Bouda, Takao Naito
  • Patent number: 7912378
    Abstract: A system operable to modulate a signal according to phase-shift keying (PSK) modulation includes one or more phase modulators that comprise one or more fractional phase modulators. A fractional phase modulator includes a splitter that splits a communication signal to yield a first communication signal with first amplitude and a second communication signal with second amplitude, where the ratio of the first and second amplitudes correspond to a phase shift. A phase shifter phase shifts the first or second communication signal. A first modulator modulates the first communication signal at a constant phase. A second modulator modulates the second communication signal at phases corresponding to the phase shift to encode data. A coupler couples the first communication signal and the second communication signal.
    Type: Grant
    Filed: January 26, 2007
    Date of Patent: March 22, 2011
    Assignee: Fujitsu Limited
    Inventors: Cechan Tian, Takao Naito
  • Patent number: 7897805
    Abstract: A polyisocyanate production method that can allow effective use of hydrogen chloride produced secondarily in a polyisocyanate production process, while allowing reduction of environmental burdens, and a polyisocyanate production system for performing the polyisocyanate production method. After chlorine is allowed to react with carbon monoxide to produce carbonyl chloride in a carbonyl chloride producing reactor, the carbonyl chloride produced in the carbonyl chloride producing reactor is allowed to react with polyamine in an isocyanate producing reactor to produce polyisocyanate. Then, after hydrochloric gas produced secondarily in the isocyanate producing reactor is purified in a hydrogen chloride purifying column, the purified hydrochloric gas is oxidized in a hydrogen chloride oxidizing reactor to produce chlorine.
    Type: Grant
    Filed: March 8, 2006
    Date of Patent: March 1, 2011
    Assignee: Mitsui Chemicals, Inc.
    Inventors: Masaaki Sasaki, Takao Naito, Fumiaki Hirata, Masato Saruwatari, Hirofumi Takahashi, Kouji Maeba, Tsugio Imaizumi, Takuya Saeki, Takashi Yamaguchi, Kouichirou Terada