Patent application number | Description | Published |
20090074425 | OPTICAL TRANSMITTER AND CONTROL METHOD THEREOF - An optical transmitter which modulates the phases and intensities of double pulses and then transmits them, includes a branching section which branches each of the input double pulses to first and second paths, a first optical modulator placed in the first path, second and third optical modulators placed in series in the second path, and a combining section which combines the double pulses having traveled through the first path with the double pulses having traveled through the second path to output double pulses. A control section controls such that each of the first and second optical modulators performs any one of relative intensity modulation and relative phase modulation on the double pulses passing through, and the third optical modulator performs relative phase modulation on the double pulses passing through. | 03-19-2009 |
20090236501 | PHOTON DETECTION METHOD AND CIRCUIT HAVING PHASE ADJUSTER - A photon detection circuit in which photon detection is performed by applying gate pulses to a light-receiving element at predetermined periods, includes: a gate-period waveform averaging section that generates averaged waveform data by averaging sampled waveform data output from the light-receiving element in the individual predetermined periods; a phase shifting section that shifts at least one of the phases of the averaged waveform data and sampled waveform data so that a phase difference between the averaged waveform data and sampled waveform date disappears; and a discrimination section that discriminates a photon detection based on the phase-adjusted sampled waveform data relative to the phase-adjusted averaged waveform data. | 09-24-2009 |
20090262942 | Method and system for managing shared random numbers in secret communication network - A method for managing shared random numbers in a secret communication network including at least one center node and a plurality of remote nodes connected to the center node, includes: sharing random number sequences between the center node and respective ones of the plurality of remote nodes; when performing random numbers sharing between a first remote node storing a first random number sequence shared with the center node and a second remote node storing a second random number sequence shared with the center node, distributing a part of the second random number sequence from the center node to the first remote node; and sharing the part of the second random number sequence between the first remote node and the second remote node. | 10-22-2009 |
20090279897 | TRANSMISSION METHOD, TRANSMITTER-RECEIVER, AND TRANSMITTING-RECEIVING SYSTEM - A transmitter-receiver having a means for automatically determining the status of transmission medium such as optical fiber, and a means for automatically setting and resetting the transmission rate and/or output power according to the status of the transmission medium, a transmission loss and gain measurement method, and a transmitting-receiving system. A transmitter-receiver comprises at least: an output power controller for controlling the output power of a transmitter; an input power measuring section for measuring the strength of input signals; and an information processor for deriving the loss or gain of a path to change the output power of the transmitter and/or the rate of data transmission according to the derived loss or gain of the path. A transmission loss and gain measurement method applied to a system comprising transmission media and a plurality of the transmitter-receivers connected via the transmission media, comprises the steps of: transmitting information on the output power of a first transmitter-receiver from the first transmitter-receiver to a second transmitter-receiver; measuring reception strength by the second transmitter-receiver when the second transmitter-receiver receives the output power information; reading the output power information by the second transmitter-receiver; and comparing the reception strength with the output power information to calculate a transmission loss or gain by the second transmitter-receiver. | 11-12-2009 |
20090316910 | METHOD AND DEVICE FOR MANAGING CRYPTOGRAPHIC KEYS IN SECRET COMMUNICATIONS NETWORK - A cryptographic key management method and device are provided by which cryptographic keys of multiple nodes can be managed easily and stably. A system includes at least one first node and a plurality of second nodes connected to the first node, and the first node individually generates and consumes a cryptographic key with each of the second nodes connected to the first node itself. A cryptographic key management device in such a system has a monitor that monitors the stored key amounts of cryptographic keys of the individual second nodes, stored at the first node, and a key management control section that performs key generation control on the first node, based on the stored key amounts. | 12-24-2009 |
20100195831 | QUANTUM KEY DISTRIBUTION SYSTEM, OPTICAL TRANSMITTER, OPTICAL MODULATION CONTROL CIRCUIT, AND OPTICAL MODULATION CONTROL METHOD - In a quantum cryptographic transmitter ( | 08-05-2010 |
20110167299 | COMMUNICATION SYSTEM AND METHOD FOR CONTROLLING THE SAME - For an error rate QBER, threshold values are preset, including a threshold value Q | 07-07-2011 |
20110243331 | SHARED RANDOM NUMBERS MANAGEMENT METHOD AND MANAGEMENT SYSTEM IN SECRET COMMUNICATION NETWORK - In a secret communication network including a center node and multiple remote nodes, the center node is provided with a virtual remote node which functions as a remote node similar to each of the remote nodes. Random numbers shared between the center node and each remote node are managed based on random number sequences used in cipher communication between the virtual remote node and one of the remote nodes. | 10-06-2011 |
20130094853 | MULTIPLEXER/DEMULTIPLEXER AND MULTIPLEXING/DEMULTIPLEXING METHOD - In order to realize a multiplexer/demultiplexer in which utilization efficiency of a frequency is high, wavelength characteristics of a transmission band is flat, the cost is low, the size is small, and a wavelength and a band are variable, the multiplexer/demultiplexer includes: first light branching means for branching inputted light into plurality of pieces of light and outputting the branched pieces of light; a plurality of light wavelength separating means for separating and outputting light outputted from the first light branching means for each of predetermined frequency bands; and an optical coupling means for making outputs having frequency bands different from each other among outputs from the light wavelength separating means gather and be outputted. | 04-18-2013 |
20130294770 | MONITORING SYSTEM, MONITORING METHOD AND MONITORING PROGRAM - A monitoring system which enables monitoring of a transponder accommodated in an optical path in a transmission node and a node according to their operation conditions is provided. The monitoring system comprises a monitor control management unit connected to at least one of ports of wavelength selective switches which monitors an inspection signal or an operation signal, and a control unit which controls the wavelength selective switch so as to enable monitoring by the monitor control management unit. | 11-07-2013 |
20140037087 | COMMUNICATION DEVICE AND CRYPTOGRAPHIC KEY CREATION METHOD IN CRYPTOGRAPHIC KEY SHARING SYSTEM - A communication device and a cryptographic key creation method are provided that enable efficient creation of cryptographic keys of which different error rates are required. A communication device ( | 02-06-2014 |
20140133800 | OPTICAL SWITCH CONTROL METHOD, OPTICAL SWITCH CONTROL DEVICE, AND OPTICAL TRANSMISSION SYSTEM - An optical switch control device includes a driving control unit ( | 05-15-2014 |
20150071303 | COMMUNICATION DEVICE AND POWER SAVING METHOD THEREOF IN DATA TRANSMISSION SYSTEM - A communication device and a power saving method in a data transmission system are provided that can achieve the prevention of element deterioration occurring when a check signal is transmitted during sleep, as well as reductions of transmission noise and power consumption. The communication device, which is connected to another communication device through transmission/reception links corresponding to multiple channels, respectively, includes communication sections ( | 03-12-2015 |
Patent application number | Description | Published |
20120149819 | ORGANIC SILICON COMPOUND, THERMOSETTING COMPOSITION CONTAINING SAID ORGANIC SILICON COMPOUND, AND SEALING MATERIAL FOR OPTICAL SEMICONDUCTOR - A liquid organosilicon compound comprising a structural unit represented by the following formula (1-a) and a structural unit represented by the following formula (1-b): | 06-14-2012 |
20130096249 | NEW ORGANOSILICON COMPOUND, THERMOSETTING RESIN COMPOSITION CONTAINING THE ORGANOSILICON COMPOUND, HARDENING RESIN AND ENCAPSULATION MATERIAL FOR OPTICAL SEMICONDUCTOR - A solution is a liquid organosilicon compound represented by general formula (1) as described below: | 04-18-2013 |
20140148536 | COMPOUND INCLUDING ORGANOPOLYSILOXANE OR SILSESQUIOXANE SKELETON HAVING ISOCYANURIC SKELETON, EPOXY GROUP AND SIH GROUP, THERMOSETTING RESIN COMPOSITION CONTAINING THE COMPOUND AS ADHESION-IMPARTING AGENT, HARDENED MATERIAL AND SEALING AGENT FOR OPTICAL SEMICONDUCTOR - The invention provides an adhesion-imparting agent having heat-resistant transparency and a high refractive index best suited for an addition hardening type composition including a reaction product of silsesquioxane and organopolysiloxane. The invention relates to a compound obtained by allowing a hydrosilylation addition reaction of (A), (B), and when necessary, (C) as described below, and a compound including an organopolysiloxane or silsesquioxane skeleton including as an essential component an isocyanuric ring skeleton and an epoxy group, and having an SiH group residue: (A) a compound including an organopolysiloxane or silsesquioxane skeleton and having three or more SiH groups in one molecule; (B) an epoxy derivative having one aliphatic unsaturated group in one molecule; and (C) organopolysiloxane having two alkenyl groups in one molecule, and having a number average molecular weight of 100 to 500,000, or an isocyanurate compound having two alkenyl groups in one molecule. | 05-29-2014 |
20150065643 | NEW ORGANOSILICON COMPOUND, THERMOSETTING RESIN COMPOSITION CONTAINING THE ORGANOSILICON COMPOUND, HARDENING RESIN AND ENCAPSULATION MATERIAL FOR OPTICAL SEMICONDUCTOR - A solution is a liquid organosilicon compound represented by general formula (1) as described below: | 03-05-2015 |
Patent application number | Description | Published |
20130206499 | INSULATOR FOR AUDIO AND METHOD FOR EVALUATING SAME - In a conventional hard material insulator, reproduced sound can be tuned with use of characteristics of the material; however, various types of acoustic materials have specific high frequency characteristics, and thus their acoustic effects lack versatility, require compatible audio devices, and change with environment, musical genre, etc. To address this, a wind-bell member (resonant member) is arranged in parallel with a main propagation path of vibration transferred from an audio device to an insulator. Accordingly, a vibration system of a wind-bell having a tone determined by many factors such as a fundamental tone, harmonic tones, lingering sound, and fluctuation assists (enhances) high frequency vibration propagated from the audio device. As a result, due to the above assist action that is different in principle from a conventional type, acoustic characteristics such as a sense of localization, resolution, and a sense of transparency and scale a sound image can be dramatically improved. | 08-15-2013 |