Patent application number | Description | Published |
20080205889 | Optical transmission system and optical transmission method - In an optical transmission system, a transmitting transceiving node generates a multiplexed optical-packet signal by performing optical wavelength multiplexing on a plurality of optical packets, and transmits the multiplexed optical-packet signal to a receiving transceiving node. The receiving transceiving node transmits the multiplexed optical-packet signal back to the transmitting transceiving node. The transmitting transceiving node detects a skew amount of the optical packet allocated to each wavelength band of the multiplexed optical-packet signal received from the receiving transceiving node, and adjusts a delay amount of the optical packet based on the detected skew amount. | 08-28-2008 |
20080273875 | Optical network system - An optical network system capable of directly routing optical signals without entailing multiple reception of identical wavelengths. A set wavelength output unit outputs a set wavelength. An N | 11-06-2008 |
20090003827 | Optical switching device - An optical switching device the size and costs of which are reduced by decreasing the number of switching elements and which can flexibly accommodate the expansion of the number of ports. An optical demultiplexing section has 2 | 01-01-2009 |
20090185804 | Optical access network system - In an optical access network system in which a relay station receives a wavelength multiplexed and time-division multiplexed optical signal (WDM optical signal) from an optical network, and the relay station transmits optical signals having specified wavelengths to subscriber units, the relay station demultiplexes the WDM optical signal into a plurality of groups with one group having a plurality of optical signals having a fixed wavelength interval between signals, then divides the optical signals of each group into k branches (k is the number of subscriber units) and inputs the signals to optical switches, and by turning ON/OFF the optical switches such that they are spaced in time, inputs the branched optical signals to the respective specified subscribers units. | 07-23-2009 |
20090297162 | Optical communication base station, optical signal conversion apparatus, and optical signal conversion method - An optical communication base station which receives an upstream optical signal having an upstream bit rate specific to each one of a plurality of lower order communication units from a corresponding one of the plurality of lower order communication units, and which transmits a downstream optical signal having a downstream bit rate specific to each one of the plurality of lower order communication units to a designated one of the plurality of lower order communication units, includes; a first optical signal conversion unit which changes the bit rate of the upstream optical signal and thereby converts the upstream optical signal into a fixed bit-rate inter-station optical signal; and a second optical signal conversion unit which converts the inter-station optical signal into the downstream optical signal by changing the bit rate of the inter-station optical signal according to the designated one of the plurality of lower order communication units. | 12-03-2009 |
20100040370 | FRAME GENERATING APPARATUS, OPTICAL TRANSMISSION SYSTEM, FRAME GENERATING METHOD, AND OPTICAL TRANSMISSION METHOD - A frame generating apparatus includes an optical-transport-network frame generator configured to generate an optical transport network frame from a client signal; and a frame decomposer configured to perform serial-parallel conversion on the optical transport network frame to generate a plurality of virtual lanes, where the optical-transport-network frame generator arranges frame synchronization bytes and virtual lane identifiers in an overhead area and/or a fixed stuff part so that a frame synchronization byte and a virtual lane identifier are arranged in each virtual lane. | 02-18-2010 |
20100254704 | TRANSCEIVER APPARATUS, COMMUNICATION CONTROL METHOD, AND CONCENTRATOR - In order to reduce the power consumption of a transceiver apparatus, In a transceiver apparatus that comprises a plurality of transmitting sections that divide input data and sends the divided data using a plurality of parallel transmission channels, at least one parallel transmission channel is determined from the plurality of parallel transmission channels in accordance with an amount of data, and a power source is supplied to the transmitting section from the plurality of transmitting sections which sends the divided data using the determined parallel transmission channel, while not supplying a power source to transmitting sections from the plurality of transmitting sections which do not send the divided data. | 10-07-2010 |
20100322630 | OPTICAL TRANSMISSION APPARATUS AND METHOD - An optical transmission apparatus including a transmitting OTL processor to rearrange a data string stored in a frame into a plurality of logical lanes, and set a lane ID used to identify in which logical lane a beginning of the data string is arranged among the plurality of logical lanes in a non-scramble area in an overhead of the frame, and a receiving OTL processor to respectively identify the lane IDs included in the data string in the respective physical lanes rearranged, determine a generation state of a bit inversion and a lane replacement for each physical lane, compensate the bit inversion and the lane replacement so that the data string in the respective physical lanes becomes same state as the data string in the respective logical lanes, based on the identified result, and rearrange the compensated data string in the respective logical lanes so as to regenerate the frame. | 12-23-2010 |
20110293266 | OPTICAL TRANSMITTING DEVICE AND OPTICAL RECEIVING DEVICE - There is provided an optical transmitting device including a detector to detect a transmission rate of a transmission signal, a transmission method selector to determine a transmission method of the transmission signal, based on the transmission rate detected by the detector, a modulation signal generator circuit to generate a modulation signal from the transmission signal, based on the transmission method determined by the transmission method selector, and an optical modulator to generate a modulated optical signal from the modulation signal generated by the modulation signal generator circuit. | 12-01-2011 |
20120177368 | OPTICAL TRANSMISSION APPARATUS AND ANALOG-TO-DIGITAL CONVERSION APPARATUS - In an optical transmission apparatus, an optical-to-electrical converter converts a received optical signal into an electrical signal, and an amplifier amplifies the resulting electrical signal. A plurality of analog-to-digital converters then convert the amplified electrical signal from analog form to digital form in a time-interleaved manner to produce digital outputs. When correcting the analog-to-digital converters, a controller varies the gain of the amplifier in such a way that a total amplitude or an average amplitude indicated by the digital outputs of the analog-to-digital converters will be equal to or greater than a specified threshold. | 07-12-2012 |
20120219282 | OPTICAL TRANSMISSION SYSTEM AND OPTICAL TRANSMISSION METHOD - An optical transmission system transmits an optical signal of multi-level modulation. In a transmitter module, a data string in a specified frame is rearranged into a plurality of logical lanes. A lane ID, which specifies in what logical lane out of the plurality of logical lanes a start of the data string is arranged, is assigned to a non-scrambled area in an overhead portion of the frame. The lane ID corresponding to one of the plurality of logical lanes is different from the lane IDs corresponding to the other remaining logical lanes. The optical signal is generated using the data string rearranged into the plurality of logical lanes. In a receiver, the lane ID is detected according to a majority method. The inversion of bits and the swapping of lanes are detected using the lane ID and compensated. | 08-30-2012 |