Patent application number | Description | Published |
20120226860 | COMPUTER SYSTEM AND DATA MIGRATION METHOD - A path is formed between a host computer and storage apparatuses without depending on the configuration of the host computer and a network and a plurality of volumes having a copy function are migrated between storage apparatuses while keeping the latest data. | 09-06-2012 |
20130311740 | METHOD OF DATA MIGRATION AND INFORMATION STORAGE SYSTEM - An example of the invention is a method of data migration from a source volume including storage areas of a plurality of source storage tiers different in performance capability to a destination volume including storage areas of a plurality of destination storage tiers different in performance capability, data relocation being performed among the plurality of source storage tiers in accordance with accesses to the source volume during the data migration. The method includes: starting the data migration between volumes from the source volume to the destination volume; acquiring information on a data arrangement in the source volume determined based on an access history to the source volume during the data migration between volumes from the source volume to the destination volume; and determining a data arrangement in the destination volume during the data migration between volumes based on the data arrangement indicated by the acquired information. | 11-21-2013 |
20130346708 | STORAGE SYSTEM AND METHOD OF CONTROLLING THE SAME - For first write request to a virtual volume, the first storage apparatus performs processing by a method of either a first write processing method that stores write data in a first logical volume associated with the virtual volume as well as transfers a first write request, to the second storage apparatus, for storing the write data in a second logical volume associated with the virtual volume of the second storage apparatus or a second write processing method that transfers a first write request, to the second storage apparatus, then selects a processing method according to a first IO load on a first area of the virtual volume of the first storage apparatus and a second IO load on the first area of the virtual volume of the second storage apparatus to perform a processing for the first write request. | 12-26-2013 |
20140101394 | COMPUTER SYSTEM AND VOLUME MANAGEMENT METHOD FOR THE COMPUTER SYSTEM - The present invention allows distribution of load generated by a single VOL to multiple processor units, by dividing the VOL into a plurality of smaller fractions called sub-VOL and distributing their ownership to multiple processor units. The division of a VOL is performed by dividing the control information of the VOL for plurality of sub-VOLs and (A) assigning VOL ownership to a processor unit for processing the tasks that are related to complete VOL (e.g. VOL RESERVE command) and (B) assigning ownership of each sub-VOL to different processor units for processing tasks that are specific to that sub-VOL (e.g. Read/Write commands). Thus the load on a singular sub-VOL owner processor unit becomes only a fraction of the total load generated by the VOL. The present invention helps in achieving a relatively even distribution of load among processor units. | 04-10-2014 |
20140108754 | STORAGE SYSTEM AND METHOD OF CONTROLLING STORAGE SYSTEM - An exemplary storage system according to the invention includes a first physical storage apparatus providing a first real volume and a second physical storage apparatus providing a second real volume to form a copy pair with the first real volume. The first physical storage apparatus provides a first host with a first storage identifier and a first volume identifier for the first host to access the first real volume. The second physical storage apparatus provides a second host with at least a part of a first virtual storage apparatus including a first virtual volume allocated the second real volume. The second physical storage apparatus assigns the first volume identifier to the first virtual volume and the first storage identifier to the first virtual storage apparatus. | 04-17-2014 |
20140195573 | STORAGE SYSTEM AND CONTROL METHOD FOR STORAGE SYSTEM - An example of the present invention is a storage system comprising a first real storage apparatus including a plurality of real resources. The first real storage apparatus includes: real resource groups allocated to a plurality of virtual storage apparatuses; first management information for associating virtual resource identifiers individually assigned to real resources in a namespace independently defined for each of the plurality of virtual storage apparatuses with real resource identifiers individually assigned to the real resources in a namespace defined for the first real storage apparatus; and a controller for receiving a command including a designation with a virtual resource identifier, converting the virtual resource identifier in the command into a real resource identifier with reference to the first management information, and processing the command with the converted real resource identifier. | 07-10-2014 |
20140201438 | STORAGE SYSTEM, METHOD OF CONTROLLING A STORAGE SYSTEM AND MANAGEMENT SYSTEM FOR STORAGE SYSTEM - An example is a method of controlling a storage system for providing a virtual storage apparatus that includes virtual storage resources associated with real storage resources of real storage apparatus. It includes receiving a virtual storage resource control command of a predetermined type specifying a first virtual storage resource in the virtual storage apparatus and a second virtual storage resource associated with the first virtual storage resource; referring to management information for managing association relations between the virtual storage resources and the real storage resources, to identify a first real storage resource associated with the first virtual storage resource and a first real storage apparatus including the first real storage resource; and selecting a second real storage resource associated with the second virtual storage resource from real storage resources within the first real storage apparatus, or creating the second real storage resource within the first real storage apparatus. | 07-17-2014 |
Patent application number | Description | Published |
20150069469 | SEMICONDUCTOR DEVICE - According to one embodiment, a semiconductor device includes a nitride semiconductor layer, a first electrode provided on the layer, a second electrode provided on the layer, a insulating film provided on the layer, a first control electrode provided on the film, and a conductor provided on the film. The first control electrode includes a first edge, and a second edge. The first edge is provided between the second edge and the first electrode. The conductor includes a first portion and a third edge positioned between the first portion and the first electrode. An electric field strength at a first region is substantially equal to an electric field strength at a second region. The first region overlaps the first edge when projected onto a plane perpendicular to a stacking direction. The second region overlaps the third edge when projected onto the plane. | 03-12-2015 |
20150263153 | SEMICONDUCTOR DEVICE - According to one embodiment, a semiconductor device includes a first semiconductor layer; a second semiconductor layer having a larger band gap than the first semiconductor layer; a third semiconductor layer having a smaller band gap than the second semiconductor layer; a first electrode being in contact with the third semiconductor layer; a second electrode being in contact with the third semiconductor layer; and a third electrode provided between the third semiconductor layer in contact with the first electrode, the second semiconductor layer directly below the first electrode, and the first semiconductor layer directly below the first electrode, and the third semiconductor layer in contact with the second electrode, the second semiconductor layer directly below the second electrode, and the first semiconductor layer directly below the second electrode, being in contact with the third semiconductor layer, the second semiconductor layer, and the first semiconductor layer via insulating film. | 09-17-2015 |
20150270355 | SEMICONDUCTOR DEVICE AND MANUFACTURING METHOD FOR THE SAME - A semiconductor device includes: a first GaN based semiconductor layer (hereinafter abbreviated as GaN layer); a second GaN layer on the first GaN layer and having a bandgap larger than that of the first GaN layer; a source electrode on the second GaN layer; a drain electrode on the second GaN layer; a gate electrode between the source electrode and the drain electrode, a gate insulating film between the gate electrode and the first GaN layer, a film thickness of the second GaN layer between the gate electrode and the first GaN layer being thinner than that of the second GaN layer between the source electrode and the first GaN layer; and a p-type third GaN layer between the second GaN layer and an end portion on the drain electrode side of the gate electrode, the gate insulating film between the gate electrode and the third GaN layer. | 09-24-2015 |
20150270379 | SEMICONDUCTOR DEVICE - A semiconductor device according to an embodiment includes: a first GaN based semiconductor layer; a second GaN based semiconductor layer disposed on the first GaN based semiconductor layer and having a bandgap larger than that of the first GaN based semiconductor layer; a source electrode disposed on the second GaN based semiconductor layer; a drain electrode disposed on the second GaN based semiconductor layer; a p-type third GaN based semiconductor layer disposed between the source electrode and the drain electrode on the second GaN based semiconductor layer; a gate electrode disposed on the third GaN based semiconductor layer; and a p-type fourth GaN based semiconductor layer disposed between the gate electrode and the drain electrode on the second GaN based semiconductor layer and disposed separated from the third GaN based semiconductor layer. | 09-24-2015 |
20160087052 | SEMICONDUCTOR DEVICE - A semiconductor device according to an embodiment includes a nitride semiconductor layer, a plurality of source electrodes provided on the nitride semiconductor layer, a plurality of drain electrodes, a plurality of gate electrodes, a first interconnection having a first distance from the nitride semiconductor layer and electrically connecting the source electrodes, a second interconnection electrically connecting the gate electrodes, and a third interconnection having a third distance from the nitride semiconductor layer and electrically connecting the drain electrodes. Each of the drain electrodes are provided between the source electrodes. Each of the gate electrodes are provided between each of the source electrodes and each of the drain electrodes. The third distance is larger than the first distance. | 03-24-2016 |
Patent application number | Description | Published |
20090210753 | LIBRARY APPARATUS, CONVEYANCE CONTROLLER, AND CONTROL METHOD THEREOF - A library apparatus includes, a drive for accessing the mobile medium, a discharge unit for discharging the mobile medium, and a conveyance controller for controlling a conveyance unit. The conveyance controller includes, a memory for storing process content when the discharge unit discharges the mobile medium, a receiver for receiving control information regarding a control unit controlling a discharge operation of the mobile medium, where the control unit is arranged in a host apparatus. The library apparatus and controlling method include determining correct process content in the discharge operation of the mobile medium from the process content stored on the storage, in accordance with the received control information, and detecting a faulty discharge operation by determining, in accordance with the determination result of the correct process content, whether process content transmitted from the host apparatus is normal or not. | 08-20-2009 |
20100306555 | Storage apparatus and authentication method - A storage apparatus includes a key control part to judge a validity of a data access from a request source based on authorization information received therefrom and authorization information created from an enciphering key included in enciphering key information received from a key management apparatus, and a control part to make the data access to the recording medium using the enciphering key in response to an access request from the request source, if the validity of the data access is confirmed. The authorization information from the request source includes a unique code created from the enciphering key if an authentication is successful in the key management apparatus in response to an authentication request from the request source. | 12-02-2010 |
20120084501 | Information processing apparatus, tape device, and computer-readable medium storing program - An acquisition unit of an information processing apparatus acquires access information indicating the state of access to a volume of a disk device at least for data read. A determination unit detects a volume in which a sequential read was performed, on the basis of the acquired access information, and determines the volume as a backup source for a backup. | 04-05-2012 |
20140059305 | MANAGEMENT APPARATUS, STORAGE DEVICE, AND INITIALIZATION METHOD - A management apparatus that performs initialization of a storage region of a storage medium is described. The management unit includes a first storage area that stores a first information representing an initialization status of the storage region of the storage medium, a second storage area that stores a second information representing an initialization progress status of the storage region of the storage medium, an initializing unit that performs initialization of the storage medium based on the second information, and a storage processing unit that updates the first information based on the second information which reflects the initialization progress status. | 02-27-2014 |
20140095820 | STORAGE CONTROL APPARATUS AND COPYING METHOD - A storage control apparatus includes: a copy processing unit to perform a first copy process of copying, when receiving a write request targeting on a write destination address with a copy of a copy source volume to a copy destination volume being not yet completed, write data of the write destination address to the copy destination volume, and to perform a second copy process, when executing a copy process of an overall storage area of the copy source volume, according to a copy sequence on a management area unit basis of management areas into which the overall storage area is segmented; and a copy sequence resetting unit to reset the copy sequences on the basis of a reception timing of the write request received during the second copy process by the copy processing unit and a write destination address. | 04-03-2014 |
20140297945 | STORAGE APPARATUS AND COPY CONTROL METHOD - A storage apparatus includes a plurality of drives having different response speeds, a memory that stores location information of data stored in the plurality of drives, and a processor operable to execute performing rearrangement of the data among the plurality of drives in accordance with a specific condition, updating the location information of the data whose rearrangement has been performed, and starting copying from data that is used for startup of a host connected to another storage apparatus among a plurality of pieces of data to be copied to the other storage apparatus in accordance with the location information stored in the memory, the other storage device being redundantly configured with the storage apparatus. | 10-02-2014 |
20150242144 | STORAGE DEVICE, CONTROLLER, AND NON-TRANSITORY COMPUTER-READABLE RECORDING MEDIUM HAVING STORED THEREIN CONTROL PROGRAM - A storage device communicably connected to another storage device. The storage device includes a plurality of copy buffers of two or more types that are to store data to be transmitted to the other storage device, a first delay time measure that measures a first delay time occurring on a communication path between the storage device and the other storage device, and a copy buffer selector that selects, on the basis of a result of comparison between the largeness of the first delay time and that of a threshold, one from the plurality of copy buffers as a copy buffer that is to store the data to be transmitted to the other storage device. | 08-27-2015 |
Patent application number | Description | Published |
20110270963 | SYSTEM AND METHOD FOR EVALUATING APPLICATION SUITABILITY IN EXECUTION ENVIRONMENT - An evaluation system evaluates the suitability of an application in a plurality of types of application execution environments based on the characteristics of this application and the usage of this application by a user. The evaluation system displays information denoting the result of this evaluation. | 11-03-2011 |
20130312055 | SECURITY MANAGEMENT DEVICE AND METHOD - In a case where a master virtual machine, which is constructed on the basis of master information for configuring either part or all of a virtual machine, and an individual virtual machine, which is constructed on the basis of individual information that is configured partially or entirely in accordance with the master information, exist as the types of virtual machines that a physical client provides to a user terminal, a security check of a plurality of virtual machines is selectively executed, with respect to each check item, for a virtual machine of the type corresponding to the contents of the check item. | 11-21-2013 |
20150212848 | SECURITY MANAGEMENT DEVICE AND METHOD - In a case where a master virtual machine, which is constructed on the basis of master information for configuring either part or all of a virtual machine, and an individual virtual machine, which is constructed on the basis of individual information that is configured partially or entirely in accordance with the master information, exist as the types of virtual machines that a physical client provides to a user terminal, a security check of a plurality of virtual machines is selectively executed, with respect to each check item, for a virtual machine of the type corresponding to the contents of the check item. | 07-30-2015 |
Patent application number | Description | Published |
20130121347 | COMMUNICATION APPARATUS - When time synchronization between communication apparatuses is performed with PTP, a PTP packet storing a time stamp is transmitted/received. At that time, an RTC is provided in a PTP packet generation unit within the communication apparatus. An RTC is also provided in a PTP packet transmission unit. These RTCs are time-synchronized by a hardware operation based on PPS/System CLK. The RTCs of the PTP packet generation unit and the PTP packet transmission unit are time-synchronized, whereby a highly precise time stamp and correction value for a time can be obtained. | 05-16-2013 |
20140204778 | COMMUNICATION SYSTEM, COMMUNICATION DEVICE, AND COMMUNICATION METHOD - A communication system includes a first communication device configured to transmit input data to a transmission path, detects a first accumulated amount of the input data, and transmit notifying data to the transmission path when the detected first accumulated amount has reached a threshold value, and a second communication device configured to receive data transmitted to the transmission path by the first communication device, detect a second accumulated amount of the received data, and output measurement information based on the detected second accumulated amount and the threshold value when having received the notifying data. | 07-24-2014 |
20140281091 | METHOD AND APPARATUS FOR IDENTIFYING CAUSE OF INTERRUPT - A method of identifying a cause of an interrupt related to an interrupt indication received from an interrupt indicating circuit in a processor, includes the steps of having the interrupt indicating circuit provided with a plurality of lowest-layer registers having a plurality of bits, each of the plurality of bits corresponding to the cause of the interrupt, and one or more upper-layer registers for aggregating the plurality of lowest-layer registers; forming a hierarchical structure with the one or more upper-layer registers and the plurality of lowest-layer register; and identifying the cause of the interrupt by having the processor read the upper-layer registers and the lowest-layer registers in order following the hierarchical structure. | 09-18-2014 |
Patent application number | Description | Published |
20090276677 | Radio Communications Device And Reception Method - A radio communications device includes a first error detection part configured to perform error detection on a header included in a packet; a determination part configured to determine whether there is consistency with respect to the length of the packet based on the header in response to the first error detection part detecting no error in the header; a decryption part configured to decrypt the packet in response to the determination part determining that there is consistency with respect to the length of the packet; and a second error detection part configured to perform error detection on the packet in response to the determination part determining that there is consistency with respect to the length of the packet, wherein the decryption part is configured to start to decrypt the packet before completion of the error detection by the second error detection part. | 11-05-2009 |
20100091776 | Packet Processing Device, Frame Control Method, And Communication Device - A packet processing device for processing data conveyed by at least one data block including a plurality of packets including a control packet having control data, includes: a packet processor for receiving and storing the data block; and a controller for processing data in each data block stored in the packet processor, wherein the controller processes each of the packets in a data block successively received by the packet processor packet by packet until the controller finds a control packet among the processed packets in the data block, and upon finding of the control packet in the data block, the controller collectively processes remainder of the data in the data block. | 04-15-2010 |
20160073355 | COMMUNICATIONS NODE, SYSTEM, COMMUNICATIONS METHOD, AND COMPUTER PRODUCT - A communications node includes a first transmitting circuit configured to transmit to plural communications nodes, a confirmation signal for confirming whether response is possible; a receiving circuit configured to receive from first communications nodes capable of responding among the plural communications nodes, a response signal for the transmitted confirmation signal; a selecting circuit configured to select from among the first communications nodes and based on reception strength of the received response signal, a second communications node to which execution of data processing is requested by the communications node; a strength calculating circuit configured to calculate based on the reception strength of the response signal from the selected second communications node, a transmission strength to the second communications node; and a second transmitting circuit configured to transmit to the second communications node and based on the calculated transmission strength, a request signal requesting execution of the data processing. | 03-10-2016 |
Patent application number | Description | Published |
20080215427 | PRODUCT INFORMATION PROVIDER SYSTEM AND METHOD - A shelf reader reads a product unique ID of an IC tag attached to a product on a shelf. In accordance with the reading result, a shelf terminal detects whether the product is taken out from the shelf or not, and forwards the detection result to a product information management server together with the product unique ID. In the product information management server, a related product information extraction section refers to a related product information database, and extracts any related product information including the type of the product taken out from the shelf. This related product information indicates a combination of a plurality of products that are considered preferable to purchase together. An advertisement information creation section creates advertisement information based on thus extracted related product information. The resulting advertisement information is forwarded to the shelf terminal, and then is displayed by an output section of the shelf terminal. | 09-04-2008 |
20080245859 | INFORMATION PROVISION INTERMEDIATION APPARATUS - An information provision intermediation apparatus is disclosed. An information provision intermediation definition table has stored therein, in correspondence with each other, an address of the information providing site of an information providing unit and an information provision condition required for the traceability data at the time of providing the information of the information providing site. A CPU acquires a traceability data group corresponding to the individual commodity ID acquired from a terminal. Based on the acquired traceability data group and the information provision condition, the CPU acquires the address of the information providing site of the information-available information providing unit, and using the acquired address, acquires the information from the information providing site and transmits it to the terminal. | 10-09-2008 |
20100106765 | INFORMATION PROVIDING METHOD AND SYSTEM THEREFOR - A notification apparatus transmits notification-related information (a notification message and a notification target(s)) to a notification-related information guarantee apparatus, and the notification-related information guarantee apparatus guarantees that the notification-related information has been received from nothing other than the notification apparatus. After the notification apparatus transmits the notification-related information guaranteed authentic to an intermediary notification apparatus, the intermediary notification apparatus also confirms whether the notification-related information has been guaranteed authentic by the notification-related information guarantee apparatus. If the notification-related information is confirmed to have been guaranteed authentic, then, the intermediary notification apparatus acquires from multiple owner-information management apparatuses the owner information (an owner name(s) and contact information) that corresponds to the notification target(s) (one or more item IDs). Thereafter, the intermediary notification apparatus notifies the notification target(s) of the notification message with the use of the owner information and transmits the notification result to the notification apparatus. | 04-29-2010 |
20100321167 | INDIVIDUAL-ITEM INFORMATION MANAGEMENT DEVICE AND METHOD - In an assembled product, a decrease in reading efficiency is avoided from being deteriorated by reading the electronic tags of the parts and the assembled product, registering their configuration information, and by placing read restriction on the electronic tags of the parts. For this purpose, manufacturing instruction information, used for assembling parts into an assembled product, is used. When replaced, the electronic tags of the assembled product are read, read restriction is removed from the assembled product, the electronic tag is read, the electronic tag of a new part to be installed is read, read restriction is placed on the electronic tag, and the configuration information is updated. An invalid part replacement is detected by comparing the configuration information. | 12-23-2010 |
Patent application number | Description | Published |
20100284479 | Radio Transmission Apparatus, Radio Reception Apparatus, Radio Transmission-Reception System, And Method Thereof - A radio transmission apparatus for transmitting a first radio signal and a second radio signal with different communication system, the apparatus includes: a first transmission unit which generates the first radio signal on the basis of a first communication system and transmits the first radio signal; a diffusion processing unit which performs diffusion processing of data allocated to DC subcarrier on the basis of the first communication system, and generate a diffusion signal; an addition unit which adds the diffusion signal and a signal obtained by orthogonal frequency division multiplex processing; and a second transmission unit which transmits the added signal as the second radio signal. | 11-11-2010 |
20110064060 | Method For Allocating Wireless Resource, Base Station, And Mobile Station - A base station allocates, when receiving a first code included in a predetermined code group from a first mobile station, a wireless resource in a first communication region corresponding to the first code, to the first mobile station, and allocates, when receiving a second code not included in the predetermined code group from a second mobile station, a wireless resource in a second communication region corresponding to the second code, to the second mobile station. | 03-17-2011 |
20120134336 | MOBILE STATION COMMUNICATION DEVICE, INTER-MOBILE STATION COMMUNICATION SYSTEM, AND INTER-MOBILE STATION COMMUNICATION METHOD - A communication device is used by a mobile station to perform wireless communication with another mobile station. The communication device includes a processor configured to set a transmission resource according to a present position of the mobile station, the transmission resource being set based on transmission resource association information including different transmission resources assigned to plural assignment areas provided at different positions along a road through which the mobile station passes; and a transmitter configured to transmit data with the use of the transmission resource that has been set. | 05-31-2012 |
Patent application number | Description | Published |
20130262939 | ERROR RESPONSE CIRCUIT, SEMICONDUCTOR INTEGRATED CIRCUIT, AND DATA TRANSFER CONTROL METHOD - In an error response circuit an analysis circuit unit analyzes a command transmitted from a first circuit section to a second circuit section, and detects a status of data transfer between the first circuit section and the second circuit section. A response circuit unit generates an error signal in accordance with the detected status of the data transfer in response to the second circuit section changing from a first power consumption state to a second power consumption state in which power consumption is lower than power consumption in the first power consumption state. A switching circuit unit transmits the error signal to the first circuit section in place of a response signal that is responsive to the command and transmitted from the second circuit section to the first circuit section. | 10-03-2013 |
20150074626 | DETERMINING METHOD, COMPUTER PRODUCT, AND DETERMINING APPARATUS - A determining method includes obtaining terminal information indicating a first object terminal that is among terminals included among partial circuits and subject to determination of whether the first object terminal is an open terminal; obtaining for each terminal, connection information and first attribute information indicating an attribute of any one among an input terminal and an output terminal; generating, by a computer, for each terminal, second attribute information indicating an attribute opposite to the attribute indicated by the first attribute information; and determining, by the computer, whether a state of the first object terminal indicated by the terminal information becomes a high-impedance state, by simulating on the basis of the connection information and the second attribute information, a state of each terminal when a value of a terminal among the terminals and indicated as an output terminal by the second attribute information, is set at a first specified value. | 03-12-2015 |
20160062814 | ERROR RESPONSE CIRCUIT, SEMICONDUCTOR INTEGRATED CIRCUIT, AND DATA TRANSFER CONTROL METHOD - In an error response circuit an analysis circuit unit analyzes a command transmitted from a first circuit section to a second circuit section, and detects a status of data transfer between the first circuit section and the second circuit section. A response circuit unit generates an error signal in accordance with the detected status of the data transfer in response to the second circuit section changing from a first power consumption state to a second power consumption state in which power consumption is lower than power consumption in the first power consumption state. A switching circuit unit transmits the error signal to the first circuit section in place of a response signal that is responsive to the command and transmitted from the second circuit section to the first circuit section. | 03-03-2016 |
Patent application number | Description | Published |
20140212132 | ADAPTIVE EQUALIZER TAP COEFFICIENT CORRECTION METHOD AND OPTICAL RECEIVER - A method of tap coefficient correction includes: obtaining a synchronization symbol difference between a first polarization and a second polarization orthogonal to the first polarization; obtaining a delay amount of each of the first polarization and the second polarization in an adaptive equalizer; calculating, in a case where a horizontal axis represents a tap number and a vertical axis represents a tap coefficient and a tap number or a nearest tap number with which an area of a drawn figure is halved is set as a gravity center of tap coefficients, a correction reference gravity center of the tap coefficients set in the adaptive equalizer, based on the synchronization symbol difference and the delay amount; and performing a correction of shifting an entire tap coefficients in units of symbol to cause the correction reference gravity center to be closest to a tap center. | 07-31-2014 |
20140363154 | OPTICAL SIGNAL PROCESSING DEVICE, OPTICAL SIGNAL PROCESSING METHOD AND RECORDING MEDIUM - An optimization unit in an optical receiver divides a symbol region out of a plurality of symbol regions into which signal points that specifies symbol information included in an optical signal are classified, into a plurality of division regions from the symbol center coordinate of the symbol region. Moreover, the optimization unit accumulates the signal points of the symbol information for every division region in the symbol region. Furthermore, based on the accumulated number of signal points for every division region, the optimization unit controls the average length of a phase estimation unit when the phase noise of the optical signal is calculated. | 12-11-2014 |
20150229401 | OPTICAL TRANSCEIVER AND SIGNAL PROCESSING METHOD FOR OPTICAL TRANSCEIVER - An optical transceiver converts a received optical signal to an electric signal and converts the electric signal to a digital signal, and has an adaptive equalizer to adaptively equalize the digital signal, a synchronization part to synchronize a first polarized wave and a second polarized wave contained in the adaptively equalized digital signal and having polarization axes perpendicular to each other, and a symbol offset determination part to determine an amount of symbol offset between the first polarized wave and the second polarized wave based upon symbol synchronization information of the first polarized wave and the second polarized wave supplied from the synchronization part, the symbol offset determination part being configured to repeat determination of the amount of symbol offset and restart the adaptive equalizer until the symbol offset is minimized. | 08-13-2015 |
20150381276 | OPTICAL TRANSMISSION SYSTEM, OPTICAL TRANSMISSION APPARATUS AND WAVELENGTH SPACING MEASUREMENT APPARATUS - An optical transmission system includes comprising: a first optical transmission apparatus to transmit wavelength-multiplexed optical signals; and a second optical transmission apparatus to receive the wavelength-multiplexed optical signals, the second optical transmission apparatus including: a receiver to perform digital coherent reception; a wavelength spacing monitor to transform a reception signal obtained by the digital coherent reception from a time domain signal to a frequency domain spectrum signal, and to monitor wavelength spacing of the spectrum signal; and a transmitter to transmit, to the first optical transmission apparatus, wavelength control information according to a monitor result obtained by the wavelength spacing monitor or the monitor result, wherein the first optical transmission apparatus includes: a receiver to receive the wavelength control information or the monitor result; and a control unit to control the wavelength spacing based on the wavelength control information or the monitor result received by the receiver. | 12-31-2015 |
Patent application number | Description | Published |
20140112661 | OPTICAL TRANSMISSION DEVICE AND METHOD - An optical transmission device that receives a wavelength division multiplexed optical signal obtained by dividing an optical packet signal and performing wavelength multiplexing and that transmits via an optical switch the received wavelength division multiplexed optical signal includes an optical power level measurement unit configured to measure respective optical power levels of respective optical signals of wavelengths included in the wavelength division multiplexed optical signal, and a routing information determinator configured to determine routing information of the wavelength division multiplexed optical signal on the basis of the measured optical power levels. | 04-24-2014 |
20140355976 | OPTICAL TRANSMISSION DEVICE, OPTICAL TRANSMISSION SYSTEM, AND OPTICAL TRANSMISSION METHOD - The optical transmission device includes an N×N optical switch, an optical packet receiver and an optical packet generation unit. The N×N optical switch transmits data in which a plurality of optical signals each having a different wavelength is multiplexed. The optical packet receiver detects change in the number of wavelengths of optical signals constituting the data. The optical packet generation unit generates, when the change is detected by the optical packet receiver, data to be transmitted by the N×N optical switch, using optical signals for the number of wavelengths after the change. | 12-04-2014 |
20140355978 | OPTICAL TRANSMISSION SYSTEM, OPTICAL TRANSMISSION APPARATUS, AND OPTICAL TRANSMISSION METHOD - An optical transmission system includes a transmission side optical transmission apparatus having a transmitting unit configured to transmit optical signals of a predetermined number of differing wavelengths, and a processor configured to apply to the optical signals transmitted from the transmitting unit, a predetermined offset related to a tilt; and a reception side optical transmission apparatus having a receiving unit configured to receive the optical signals transmitted from the transmitting unit, a measuring unit configured to measure an optical signal count of the optical signals receivable by the receiving unit, and a notifying unit configured to give notification of the optical signal count measured by the measuring unit. The processor adjusts the offset in an increasing direction when the optical signal count notified by the notifying unit increases, and adjusts the offset in a decreasing direction when the optical signal count notified by the notifying unit decreases. | 12-04-2014 |
20140355980 | OPTICAL COMMUNICATION APPARATUS AND CONTROL METHOD THEREOF - An optical communication apparatus includes a variable resistor unit, a measurement unit, and a control unit. The variable resistor unit is arranged at a pre-stage of an electrical/optical conversion unit, which converts an electrical signal obtained by converting an input packet to an optical signal having a waveform corresponding to a potential difference between a positive phase component and a negative phase component of the electrical signal by using the potential difference. The variable resistor unit provides a resistor that varies a midpoint of potential of the positive phase component or the negative phase component. The measurement unit measures a ratio of a presence period, which is a period where the input packet is present, to a sum of the presence period and a non-presence period. The control unit controls a value of the resistor provided to the positive phase component or the negative phase component based on the ratio. | 12-04-2014 |