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1. 发明授权

EP2003812B1 Method and device for managing cryptographic keys in secret communications network 有权
公开(公告)号：EP2003812B1
公开(公告)日：2020-07-22
申请号：EP08158071.4
申请日：2008-06-11
申请人： NEC Corporation
发明人： Maeda, Wakako , Tajima, Akio , Tanaka, Akihiro , Takahashi, Seigo
IPC分类号： H04L9/08

2. 发明授权

EP0923263B1 Optical packet exchange system and optical switch 有权
标题翻译：用于光学包和光交换矩阵耦合系统
公开(公告)号：EP0923263B1
公开(公告)日：2008-12-10
申请号：EP98123440.4
申请日：1998-12-11
申请人： NEC CORPORATION
发明人： Araki, Soichiro , Suemura, Yoshihiko , Tajima, Akio , Takahashi, Seigo , Maeno, Yoshiharu , Henmi, Naoya
IPC分类号： H04Q11/00 , H04L12/56
CPC分类号： H04Q11/0001 , H04L49/25 , H04L49/30 , H04L49/50 , H04Q2011/0024 , H04Q2011/0039 , H04Q2011/0045 , H04Q2011/005

3. 发明公开

EP1742409A1 Communication system and method for controlling the same 审中-公开
标题翻译：公民制和德法国人
公开(公告)号：EP1742409A1
公开(公告)日：2007-01-10
申请号：EP06014178.5
申请日：2006-07-07
申请人： NEC Corporation
发明人： Tanaka, Akihiro , Tajima, Akio , Takahashi, Seigo , Maeda, Wakako
IPC分类号： H04L9/08 , G06F11/00
CPC分类号： H04L1/242 , H04L9/0858 , H04L2209/34
摘要： An efficient and stable communication system and a system control method are provided which enable efficient and stable operation. In said system and method at least one item to monitor (monitored item) and a fault-detection threshold for each monitored item are previously set. Based on such monitored item and its fault-detection threshold, a fault is identified, and then appropriate recovery is performed depending on the identified fault. The monitored item may be an error rate, a change rate of the error rate, a shared data generation rate, or the like. In the communication system
a first communication device communicates with a second communication device through a transmission line and includes: setting at least one fault-detection threshold for each monitored item; comparing a measured value for each monitored item with at least one fault-detection threshold set for the monitored item, to determine whether a corresponding fault occurs; and when it is determined that the corresponding fault occurs, performing recovery of the communication system from the corresponding fault.
摘要翻译：提供了一种高效稳定的通信系统和系统控制方法，可实现高效稳定的操作。在所述系统和方法中，预先设置了至少一个监视项目（监视项目）和每个被监视项目的故障检测阈值。根据这种监控项目及其故障检测阈值，识别故障，然后根据识别出的故障进行适当的恢复。所监视的项目可以是错误率，错误率的变化率，共享数据生成速率等。在通信系统中，第一通信设备通过传输线与第二通信设备通信，并且包括：为每个被监控项目设置至少一个故障检测阈值; 将每个被监视项目的测量值与为被监视项目设置的至少一个故障检测阈值进行比较，以确定是否发生相应的故障; 并且当确定相应的故障发生时，从相应的故障执行通信系统的恢复。

4. 发明授权

EP0914015B1 Optical add-drop multiplexer 有权
标题翻译：光学分插复用器
公开(公告)号：EP0914015B1
公开(公告)日：2006-12-20
申请号：EP98120406.8
申请日：1998-10-28
申请人： NEC CORPORATION
发明人： Shimomura, Hirofumi , Takahashi, Seigo , Henmi, Naoya
IPC分类号： H04Q11/00 , H04J14/02 , H04B10/213
CPC分类号： H04Q11/0001 , H01S3/06754 , H01S3/06758 , H01S3/094061 , H01S3/10007 , H01S3/1608 , H04J14/0204 , H04J14/0206 , H04J14/0212 , H04J14/0213 , H04J14/0221

5. 发明授权

EP1708364B1 Photo detecting circuit and noise elimination method 有权
标题翻译：光电检测电路和噪声消除方法
公开(公告)号：EP1708364B1
公开(公告)日：2017-11-22
申请号：EP06006588.5
申请日：2006-03-29
申请人： NEC Corporation
发明人： Takahashi, Seigo , Tajima, Akio , Takeuchi, Takeshi , Tanaka, Akihiro , Maeda, Wakako
IPC分类号： H03F1/26
CPC分类号： H03F1/26 , H03F3/087 , H03F2200/198
摘要： In a photo detecting circuit using an avalanche photodiode (APD), a pulse noise mask signal indicating the timing of occurrence of a pulse noise is generated by XORing a reverse-bias-pulse application timing signal and its delayed signal. Pulse noises are eliminated by ANDing an output signal of the APD and the pulse noise mask signal. Alternatively, a pulse noise is estimated by taking the average for the output current signal a given number of times. Pulse noises are eliminated by subtracting the estimated pulse noise from the APD output signal (Fig. 1).

6. 发明公开

EP1848142A2 Secret communications system and channel control method 有权
标题翻译：系统地球物理学与科学与工程学院
公开(公告)号：EP1848142A2
公开(公告)日：2007-10-24
申请号：EP07007732.6
申请日：2007-04-16
申请人： NEC CORPORATION
发明人： Tajima, Akio , Tanaka, Akihiro , Maeda, Wakako , Takahashi, Seigo
IPC分类号： H04L9/08
CPC分类号： H04L9/0852 , H04L9/0855
摘要： A secret communications system realizes point-to-multipoint or multipoint-to-multipoint connections of both quantum channels and classical channels. Multiple remote nodes are individually connected to a center node through optical fiber, and random-number strings K1 to KN are individually generated and shared between the respective remote nodes and the center node. Encrypted communication is performed between each remote node and the center node by using the corresponding one of the shared random-number strings K1 to KN as a cryptographic key. The center node is provided with a switch section for quantum channels and a switch section for classical channels. Switching control on each of these switch sections is performed independently of the other by a controller.
摘要翻译：秘密通信系统实现了量子通道和经典通道的点对多点或多点到多点连接。多个远程节点通过光纤单独连接到中心节点，并且在各个远程节点和中心节点之间分别生成并共享随机数字串K1至KN。通过使用共享随机数字符串K1至KN中的相应一个作为加密密钥，在每个远程节点和中心节点之间执行加密通信。中心节点设置有用于量子通道的开关部分和经典通道的开关部分。这些开关部分中的每一个的开关控制通过控制器独立地执行。

7. 发明公开

EP1041750A3 Optical receiving circuit and optical communication device 审中-公开
标题翻译：光接收电路和光通信装置
公开(公告)号：EP1041750A3
公开(公告)日：2004-10-27
申请号：EP00106630.7
申请日：2000-03-28
申请人： NEC CORPORATION
发明人： Tajima, Akio , Takahashi, Hiroaki , Araki, Soichiro , Henmi, Naoya , Suemura, Yoshihiko , Maeno, Yoshiharu , Takahashi, Seigo
IPC分类号： H04B10/158 , H03K5/08 , H04L25/06
CPC分类号： H04B10/6931
摘要： An optical receiving circuit 1 is composed of a preamplifier circuit 2, an output differential amplifier 3 and a mean value holding circuit 4. The optical receiving circuit 1 is connected to a photodetector 5 for receiving an input optical signal and outputting current. For the preamplifier circuit 2, a transimpedance type circuit may also be used. The preamplifier circuit 2 comprises a feedback resistor 21 and a resistor for detecting output voltage 22, the transimpedance gain is 55 dB Ω and 3 dB bandwidth when the photodetector 5 the capacity of which is 0.2 pF is connected to its output is 8 GHz. The output differential amplifier 3 discriminates and regenerates data by regulating reference voltage Vref between the high level and the low level of the amplitude of an input signal. The mean value holding circuit 4 includes a sample-hold circuit 41 and capacity 42 for holding the mean value of voltage output from the preamplifier circuit 2. As a CR time constant based upon the capacity 42 and the resistor for detection 22 is 1 ns., the mean value level of a received signal can be detected in approximately one byte of the data of 10 Gb/s. The sample-hold circuit 41 samples the detected mean value level according to a sampling pulse from an external device and holds it. The output of the sample-hold circuit 41 is used for the reference voltage of the differential amplifier 3.

8. 发明公开

EP1041750A2 Optical receiving circuit and optical communication device 审中-公开
标题翻译： Optische Empfangsschaltung und optische Kommunikationsvorrichtung
公开(公告)号：EP1041750A2
公开(公告)日：2000-10-04
申请号：EP00106630.7
申请日：2000-03-28
申请人： NEC CORPORATION
发明人： Tajima, Akio , Takahashi, Hiroaki , Araki, Soichiro , Henmi, Naoya , Suemura, Yoshihiko , Maeno, Yoshiharu , Takahashi, Seigo
IPC分类号： H04B10/158
CPC分类号： H04B10/6931
摘要： An optical receiving circuit 1 is composed of a preamplifier circuit 2, an output differential amplifier 3 and a mean value holding circuit 4. The optical receiving circuit 1 is connected to a photodetector 5 for receiving an input optical signal and outputting current. For the preamplifier circuit 2, a transimpedance type circuit may also be used. The preamplifier circuit 2 comprises a feedback resistor 21 and a resistor for detecting output voltage 22, the transimpedance gain is 55 dB Ω and 3 dB bandwidth when the photodetector 5 the capacity of which is 0.2 pF is connected to its output is 8 GHz. The output differential amplifier 3 discriminates and regenerates data by regulating reference voltage Vref between the high level and the low level of the amplitude of an input signal. The mean value holding circuit 4 includes a sample-hold circuit 41 and capacity 42 for holding the mean value of voltage output from the preamplifier circuit 2. As a CR time constant based upon the capacity 42 and the resistor for detection 22 is 1 ns., the mean value level of a received signal can be detected in approximately one byte of the data of 10 Gb/s. The sample-hold circuit 41 samples the detected mean value level according to a sampling pulse from an external device and holds it. The output of the sample-hold circuit 41 is used for the reference voltage of the differential amplifier 3.
摘要翻译：光接收电路1由前置放大器电路2，输出差分放大器3和平均值保持电路4组成。光接收电路1连接到用于接收输入光信号并输出电流的光电检测器5。对于前置放大器电路2，也可以使用跨阻型电路。前置放大器电路2包括用于检测输出电压22的反馈电阻器21和电阻器，当其电容为0.2pF的光电检测器5连接到其输出端时，跨阻抗增益为55dB OMEGA和3dB带宽为8GHz。输出差分放大器3通过调节输入信号的幅度的高电平和低电平之间的参考电压Vref来识别和再生数据。平均值保持电路4包括采样保持电路41和用于保持从前置放大器电路2输出的电压的平均值的电容42.由于基于电容42和检测电阻22的CR时间常数为1ns。可以在10Gb / s的数据的大约一个字节中检测接收信号的平均值电平。采样保持电路41根据来自外部设备的采样脉冲对检测到的平均值电平进行采样并保持。采样保持电路41的输出用于差分放大器3的参考电压

9. 发明公开

EP1848142A3 Secret communications system and channel control method 有权
标题翻译：系统，用于保密通信和信道控制方法
公开(公告)号：EP1848142A3
公开(公告)日：2014-07-02
申请号：EP07007732.6
申请日：2007-04-16
申请人： NEC Corporation
发明人： Tajima, Akio , Tanaka, Akihiro , Maeda, Wakako , Takahashi, Seigo
IPC分类号： H04L9/08
CPC分类号： H04L9/0852 , H04L9/0855
摘要： A secret communications system realizes point-to-multipoint or multipoint-to-multipoint connections of both quantum channels and classical channels. Multiple remote nodes are individually connected to a center node through optical fiber, and random-number strings K1 to KN are individually generated and shared between the respective remote nodes and the center node. Encrypted communication is performed between each remote node and the center node by using the corresponding one of the shared random-number strings K1 to KN as a cryptographic key. The center node is provided with a switch section for quantum channels and a switch section for classical channels. Switching control on each of these switch sections is performed independently of the other by a controller.

10. 发明公开

EP1848128A1 Optical communication device and quantum key distribution system using the same 有权
标题翻译： Optische Kommunikationsvorrichtung undQuantenschlüsselverteilungssystem
公开(公告)号：EP1848128A1
公开(公告)日：2007-10-24
申请号：EP07090078.2
申请日：2007-04-20
申请人： NEC Corporation
发明人： Tanaka, Akihiro , Tajima, Akio , Takahashi, Seigo , Maeda, Wakako
IPC分类号： H04B10/155 , H04L9/08 , H04B10/30
CPC分类号： H04B10/5051 , H04B10/505 , H04B10/54 , H04B10/548 , H04B10/70 , H04L9/0858
摘要： An optical communication apparatus that can perform stable intensity and phase modulation on an optical pulse at high speed is provided, as well as a quantum key distribution system using the apparatus. Using multilevel signals for the electric signals (RF1, RF2) to be applied to two arms of a two-electrode Mach-Zehnder modulator, phase modulation is performed on an optical pulse in accordance with the average of the levels of the signals (RF1, RF2), and intensity modulation is performed on the optical pulse in accordance with the voltage difference between the signals (RF1, RF2), whereby stable high-speed multilevel modulation can be realized. The cryptographic key generation rate in a decoy quantum key distribution system is enhanced.
摘要翻译：提供了可以对光脉冲高速执行稳定的强度和相位调制的光通信装置，以及使用该装置的量子密钥分发系统。使用多电平信号将电信号（RF1，RF2）施加到两电极马赫 - 策德尔调制器的两个臂上，根据信号电平（RF1，RF2）的平均值对光脉冲进行相位调制， RF2），并且根据信号（RF1，RF2）之间的电压差对光脉冲执行强度调制，从而可以实现稳定的高速多电平调制。诱饵量子密钥分发系统中的加密密钥生成率得到提高。

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