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1. 发明专利

JP2012249057A Light transmission/reception device 审中-公开
标题翻译：光传输/接收设备
公开(公告)号：JP2012249057A
公开(公告)日：2012-12-13
申请号：JP2011118860
申请日：2011-05-27
申请人： Hitachi Ltd , 株式会社日立製作所
发明人： YABUTA KEIZO , TAJIMI NOBURO
IPC分类号： H04B10/02 , H04B10/00 , H04B10/04 , H04B10/06 , H04B10/08 , H04B10/14 , H04B10/18 , H04B10/26 , H04B10/28 , H04J14/00 , H04J14/02
摘要： PROBLEM TO BE SOLVED: To suppress the effect on telephone speech signals, which call for particularly rigorous S/N quality requirements, due to S/N deterioration caused by beat noise, which is constant even when a modulation index decreases and decreases only the signal level, and is generated between optical signals in a CMTS due to proximity of optical transmission wavelengths of upstream signals of CMs, in a transmission equalization scheme, which controls the level of electric signals of the CMs and is adopted in upstream signals of an RFOG system, where the optical modulation index is controlled in terms of optical signals of an R-ONU, that is, the modulation index of the R-ONU at a high reception level is decreased in the CMTS.SOLUTION: A transmission path loss L is calculated by detecting a reception level of an optical downstream signal. An R-ONU controls a bias current Ib of a semiconductor laser according to the transmission path loss L, so as to make an OMI constant. Thereby, C/N deterioration of an upstream signal due to increase in the effect of optical heterodyne interference during occurrence of OBI is prevented.
摘要翻译：要解决的问题：为了抑制由于由调谐指数降低而变化的节拍噪声引起的S / N恶化而要求特别严格的S / N质量要求的电话语音信号的影响在传输均衡方案中由于CM的上行信号的光传输波长的接近而在CMTS中的光信号之间产生信号电平，该传输均衡方案控制CM的电信号的电平并且在上行信号中被采用根据R-ONU的光信号控制光调制指数的RFOG系统，即在CMTS中，高接收电平的R-ONU的调制指数减小。解决方案：通过检测光学下行信号的接收电平来计算传输路径损耗L. R-ONU根据传输路径损耗L控制半导体激光器的偏置电流Ib，以使OMI恒定。因此，防止了在OBI发生期间由于光学外差干扰的影响增加而导致的上游信号的C / N恶化。版权所有（C）2013，JPO＆INPIT

2. 发明专利

JP2005086466A Burst optical receiving device by gain switch system 有权
标题翻译：通过增益开关系统的BURST光接收装置
公开(公告)号：JP2005086466A
公开(公告)日：2005-03-31
申请号：JP2003316185
申请日：2003-09-09
申请人： Hitachi Communication Technologies Ltd , Hitachi Ltd , 株式会社日立コミュニケーションテクノロジー , 株式会社日立製作所
发明人： TOSAKA KENJI , TAJIMI NOBURO , MORITA YOSHINOBU , ABE YOSHITAKA
IPC分类号： H04B10/07 , H04B10/272 , H04B10/293 , H04B10/40 , H04B10/50 , H04B10/524 , H04B10/564 , H04B10/572 , H04B10/58 , H04B10/60 , H04B10/69 , H04L25/03 , H04B10/04 , H04B10/06 , H04B10/14 , H04B10/26 , H04B10/28
摘要： PROBLEM TO BE SOLVED: To provide a receiving device where a wide reception dynamic range and miniaturization are attained in high speed optical burst signal reception.
SOLUTION: In the receiving device of a base station, an outer reset signal is inputted to a preamplifier, and the preamplifier switches a gain in accordance with optical burst signal intensity from each slave station. When the gain is switched, a reset signal is transmitted to ATC in a post-stage and a received signal level discrimination threshold of ATC is set again. Since the signal determination threshold of ATC in the post-stage is set again in accordance with the gain switching of the preamplifier, ATC can set an appropriate signal determination threshold corresponding to an output of the preamplifier.
COPYRIGHT: (C)2005,JPO&NCIPI
摘要翻译：要解决的问题：提供一种在高速光脉冲串信号接收中获得宽的接收动态范围和小型化的接收装置。解决方案：在基站的接收设备中，外部复位信号被输入到前置放大器，并且前置放大器根据来自每个从站的光突发信号强度切换增益。当增益被切换时，在后级将复位信号发送到ATC，再次设置ATC的接收信号电平鉴别阈值。由于根据前置放大器的增益切换再次设置后级中的ATC的信号判定阈值，所以ATC可以设置与前置放大器的输出对应的适当的信号判定阈值。版权所有（C）2005，JPO＆NCIPI

3. 发明专利

JPH02166930A LIGHT RECEIVING CIRCUIT 失效
公开(公告)号：JPH02166930A
公开(公告)日：1990-06-27
申请号：JP32062888
申请日：1988-12-21
申请人： HITACHI LTD
发明人： TAJIMI NOBURO
IPC分类号： H04B10/572 , H04B10/2507 , H04B10/293 , H04B10/564
摘要： PURPOSE:To eliminate malfunction due to the change of a dark current by using two APDs with the same dark current characteristic, and negating the dark current of the APD receiving light by that of another APD. CONSTITUTION:The APD1 which receives an optical signal, and the APD4 not receiving the light but having the same dark current characteristic as that of the APD1 are provided. A signal current Is and the dark current Id flow on the APD1, and only the dark current Id flows on the APD4, and a differential amplifier AMP 3 negates voltage drop Id, Rt due to both dark currents Id, and DC/DC is controlled by amplifying only the voltage drop Is, RL by the Is. Therefore, it is possible to keep the Is in spite of the change of the Id by changing the multiplication factor of the APD1. In such a way, an output signal can be kept constant by controlling the multiplication factor of the APD.

4. 发明专利

JP2014158211A Receiving device and optical video-distribution system 审中-公开
标题翻译：接收设备和光学视频分配系统
公开(公告)号：JP2014158211A
公开(公告)日：2014-08-28
申请号：JP2013028959
申请日：2013-02-18
申请人： Hitachi Ltd , 株式会社日立製作所
发明人： YOSHIOKA HIROYUKI , TAJIMI NOBURO , MORITA YOSHINOBU
IPC分类号： H04B10/2513 , H04B10/2537 , H04B10/27 , H04J14/00 , H04J14/02 , H04L27/14
摘要： PROBLEM TO BE SOLVED: To perform dynamic wavelength dispersion compensation according to an optical transmission line.SOLUTION: A receiving device reproducing a multi-channel video signal comprises: an optical-current conversion circuit converting an FM modulation optical signal outputted from a transmitting device into an FM modulation current signal; a first current-voltage conversion circuit converting the FM modulation current signal outputted from the optical-current conversion circuit into an FM modulation voltage signal; an FM demodulation circuit reproducing the multi-channel video signal from the FM modulation voltage signal outputted from the first current-voltage conversion circuit; an induced Brillouin scattering suppression signal extraction circuit extracting an induced Brillouin scattering suppression signal from a bias-voltage supply line of the optical-current conversion circuit; and a phase-shifting circuit adjusting a phase of a voltage signal outputted from the induced Brillouin scattering suppression signal extraction circuit. The phase-shifting circuit outputs a voltage signal having a reverse phase to an amplitude modulation signal component of the voltage signal outputted from the FM demodulation circuit, and the receiving device outputs a signal obtained by multiplying the voltage signal outputted from the FM demodulation circuit by the voltage signal outputted from the phase-shifting circuit.
摘要翻译：要解决的问题：根据光传输线执行动态波长色散补偿。解决方案：再现多通道视频信号的接收装置包括：光电流转换电路，将从发送装置输出的FM调制光信号转换为 FM调制电流信号; 第一电流电压转换电路，将从所述光电流转换电路输出的FM调制电流信号转换为FM调制电压信号; FM解调电路，从第一电流 - 电压转换电路输出的FM调制电压信号再现多声道视频信号; 感应布里渊散射抑制信号提取电路，从所述光电流转换电路的偏置电压提供线提取感应的布里渊散射抑制信号; 以及调整从感应的布里渊散射抑制信号提取电路输出的电压信号的相位的移相电路。移相电路将与FM解调电路输出的电压信号的振幅调制信号成分相反的电压信号输出，接收装置输出通过将从FM解调电路输出的电压信号相乘得到的信号从移相电路输出的电压信号。

5. 发明专利

JPH0321129A BIDIRECTIONAL OPTICAL COMMUNICATION SYSTEM 失效
公开(公告)号：JPH0321129A
公开(公告)日：1991-01-29
申请号：JP15455189
申请日：1989-06-19
申请人： HITACHI LTD
发明人： TAJIMI NOBURO
IPC分类号： G02B27/28 , H04B10/00
摘要： PURPOSE:To prevent laser oscillation from being unstabilized by using a polarization plane maintaining fiber for a transmission line and providing polarizers where planes of polarization are shifted from each other by 90 deg. on the inlet of the light emitting element side and the outlet of the light receiving element side. CONSTITUTION:Since the polarization planes of the polarizers 3a, 3b are shifted by 90 deg., an optical signal outputted from E/O of a channel A is interrupted by the polarizer 3a even if it is tried to be inputted to the O/E of a channel B by the reflection of a connector or the like of a directional coupler 1. On other other hand, an optical signal from the E/O of the channel B is inputted to the O/E of the channel B having the same plane of polarization but is not inputted to the channel A having different plane of polarization. Thereby, near- end leakage leaking the optical signal of the channel A to the O/E of the channel B can be reduced. In addition, the optical signal of the channel B weakened by a transmission line loss can be accurately restored. Since the optical signal of the channel B is not inputted to the E/O of the channel A, the laser oscillation of a light source can be prevented from being unstabilized.

6. 发明专利

JPH0236607A LIMITER CIRCUIT 失效
公开(公告)号：JPH0236607A
公开(公告)日：1990-02-06
申请号：JP18563488
申请日：1988-07-27
申请人： HITACHI LTD , NIPPON TELEGRAPH & TELEPHONE
发明人： TAJIMI NOBURO , NAGOYA YOSHINORI , SHUDO KOICHI
IPC分类号： H03G11/00
摘要： PURPOSE:To obtain excellent accuracy, frequency characteristic and distortion characteristic by adopting a feedback type utilizing a differential amplifier for a limiter circuit and employing a transistor(TR) to constitute its feedback circuit. CONSTITUTION:The feedback type limiter circuit consists of a differential amplifier 1 and a feedback TR 3 for limiter. Then the TR 3 for limiter is completely turned off in the region where no limiter is applied. Thus, the original signal is not distorted and the deterioration in the frequency characteristic is not caused. Since the difference from a setting voltage is compressed to a fraction of loop gain of the feedback circuit in the limiter region, it is possible to apply limiting up to a high frequency when a high gain is applied to the feedback circuit at a broad band. Thus, the limiter circuit with excellent accuracy, distortion characteristic and frequency characteristic is obtained as a simple circuit against a signal with a small amplitude and a wide band such as a picture signal.

7. 发明专利

JPS62126829A RUSH-CURRENT PREVENTING CIRCUIT 失效
公开(公告)号：JPS62126829A
公开(公告)日：1987-06-09
申请号：JP26488985
申请日：1985-11-27
申请人： HITACHI LTD
发明人： TAJIMI NOBURO
IPC分类号： G05F1/10 , H02J1/00

8. 发明专利

JP2012029226A Optical signal distributor and system thereof 有权
标题翻译：光信号分配器及其系统
公开(公告)号：JP2012029226A
公开(公告)日：2012-02-09
申请号：JP2010168423
申请日：2010-07-27
申请人： Hitachi Ltd , 株式会社日立製作所
发明人： YABUTA KEIZO , TAJIMI NOBURO
IPC分类号： H04N7/22 , H04B10/075 , H04B10/27 , H04B10/29 , H04N21/61 , H04N21/647
摘要： PROBLEM TO BE SOLVED: To provide an optical signal distributor capable of adapting the system configuration as needed to a changed distribution number of an optical image signal.SOLUTION: Optical fiber connection information between an optical amplifier board for optical image signal relaying 31, an optical switch distributor board for optical image signal redundancy changeover 30, and an optical amplifier board for optical image signal distribution 29 is noticed and registered to a supervisory control board 33 in an electric signal indicating numbers shown on thumb rotary switches 7, 15 via a plug-in connector 43 and a distributing board 41 by methods of setting at a front panel and the like. The notice registration is also implemented as needed at the time of a distribution change of an optical fiber cable so that a monitoring control system renews a system configuration including optical fiber cable connection information and reflects the change on fault detection.
摘要翻译：要解决的问题：提供一种能够根据需要将系统配置适应于光学图像信号的改变分配数量的光信号分配器。
解决方案：注意到用于光学图像信号中继的光学放大器板31，用于光学图像信号冗余切换30的光学开关分配器板和用于光学图像信号分配的光学放大器板29之间的光纤连接信息，并注册到通过设置在前面板等的方式，通过插入式连接器43和分配板41，在电信号中指示拇指旋转开关7,15所示的数字的监视控制板33。在光缆分配更换时，还需要进行通知注册，使得监控控制系统更新包括光缆连接信息的系统配置，并反映故障检测的变化。版权所有（C）2012，JPO＆INPIT

9. 发明专利

JP2000299747A NETWORK TERMINATOR 失效
公开(公告)号：JP2000299747A
公开(公告)日：2000-10-24
申请号：JP10712099
申请日：1999-04-14
申请人： NIPPON TELEGRAPH & TELEPHONE , OKI ELECTRIC IND CO LTD , NEC CORP , FUJITSU LTD , HITACHI LTD
发明人： FUJIKAWA SHUICHI , YAMANO SEIICHI , KOMATSU KAZUTOSHI , SAKAI KAZUNORI , FUKUDA SETSU , TAJIMI NOBURO
IPC分类号： H04M11/00 , H04L12/02
摘要： PROBLEM TO BE SOLVED: To obtain a network terminator that can suppress power consumption at communication and also reduce power of a digital service unit. SOLUTION: The network terminator 1 that is connected to a digital service unit 10 and has a polarity inversion detection circuit 5, a dial circuit 2, and a layer 1 control section 7 and a layer 2 control section 8 respectively controlling the polarity inversion detection circuit 5 and the dial circuit 2, is provided with a positive polarity current detection circuit 3 that detects a DC current with positive polarity flowing through a subscriber line, a DC termination resistor that supplies a current with opposite polarity, a changeover circuit 6 that connects or disconnects the DC termination resistor, and a polarity change decision section 4 that controls the changeover circuit 6 on the basis of the detection result of the positive polarity current detection circuit 3. The polarity change decision section 4 allows the changeover circuit 6 to connect or disconnect the DC termination resistor on the basis of the decision result.

10. 发明专利

JPH0943294A LINE CAPACITY MEASURING METHOD 失效
公开(公告)号：JPH0943294A
公开(公告)日：1997-02-14
申请号：JP19164095
申请日：1995-07-27
申请人： NIPPON TELEGRAPH & TELEPHONE , NEC CORP , HITACHI LTD , FUJITSU LTD , OKI ELECTRIC IND CO LTD
发明人： YAMANO SEIICHI , ONO TATSUHIRO , GOTODA TAKAO , KOMATSU KAZUTOSHI , TAJIMI NOBURO
IPC分类号： G01R31/02 , G01R27/26 , H04B3/46
摘要： PROBLEM TO BE SOLVED: To realize a line capacity measuring method which judges the presence of connection of a device to be connected to one end of a metallic line without using a measuring device with a reference capacity or for special use. SOLUTION: A DC separation capacity is utilized to fetch a transmission signal. A circuit which opens or closes a line separation switch 3 to charge the DC separation capacity 9 and a circuit which charges an input capacity of a device 1 connected to one end of a metallic line 2 and the DC separation capacity 9 in parallel are formed to measure charging time t1 and t2. The t1 and t2 are compared to judge whether the device having a specified input capacity is connected or not.

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