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1. 发明申请

WO1998018222A1 OPTICAL TRANSMITTER AND OPTICAL TRANSMISSION SYSTEM 审中-公开
标题翻译：光学发射器和光传输系统
公开(公告)号：WO1998018222A1
公开(公告)日：1998-04-30
申请号：PCT/JP1996003022
申请日：1996-10-18
申请人： HITACHI, LTD. , HITACHI MICROCOMPUTER SYSTEM, LTD. , HITACHI COMMUNICATION SYSTEMS, INC. , HANEDA, Makoto , HANAWA, Hiroaki , HARASAWA, Katsuyoshi , YAMAHARA, Kenji
发明人： HITACHI, LTD. , HITACHI MICROCOMPUTER SYSTEM, LTD. , HITACHI COMMUNICATION SYSTEMS, INC.
IPC分类号： H04B10/14
CPC分类号： H04B10/25
摘要： In an optical transmission system using a point-multipoint transmission system, a controller for controlling the drive of an LD is provided in an optical transmitter installed in a subscriber's house; by means of the controller, the LD of the optical transmitter is usually set in a zero-bias state or in a reversely biased state; an on-hook signal sent from a telephone set or a computer connected to the optical transmitter when the telephone set or the computer is in an on-hook operation by the user is detected; and a forward bias current is made to flow through the LD based on the on-hook signal. Since the LD of the optical transmitter installed in the subscriber's house is set in a reversely biased or in a zero-bias state when it is in an on-hook operation, the spontaneous emission components disappear from the LD of the optical transmitter. In addition, since a modulated current based on the data signal to be transmitted while the forward bias current flows through the LD is given to the LD, optical signals are outputted from the LD without light emission delay. Moreover, since the transmission and reception of the optical signals are made through the same optical fiber and the optical signals are transmitted by adjusting the output level by the amount corresponding to the attenuation of received signals caused by transmission loss, the received levels of optical signals from each subscriber's house at the subscriber's terminal station are uniform.
摘要翻译：在使用点对多点传输系统的光传输系统中，在安装在用户住宅内的光发射机中设置用于控制LD的驱动的控制器; 通过控制器，光发射机的LD通常设置为零偏置状态或反向偏置状态; 检测到当电话机或计算机处于用户的挂机操作时从电话机或连接到光发射机的计算机发送的挂机信号; 并且基于挂机信号使正向偏置电流流过LD。由于安装在用户住宅中的光发射机的LD在处于挂机操作时被设置为反向偏置或零偏置状态，所以自发发射成分从光发射机的LD消失。此外，由于在向前偏置电流流过LD的情况下基于要发送的数据信号的调制电流被提供给LD，所以从LD输出光信号而没有发光延迟。此外，由于通过相同的光纤进行光信号的发送和接收，并且通过将输出电平调整为与由传输损耗引起的接收信号的衰减相对应的量来传输光信号，所接收的光信号电平来自用户终端的每个用户的房屋是统一的。

2. 发明申请

WO1998018221A1 OPTICAL TRANSMITTER AND OPTICAL TRANSMISSION SYSTEM 审中-公开
标题翻译：光传输和光传输系统
公开(公告)号：WO1998018221A1
公开(公告)日：1998-04-30
申请号：PCT/JP1996003021
申请日：1996-10-18
申请人： HITACHI, LTD. , HITACHI MICROCOMPUTER SYSTEM, LTD. , HITACHI COMMUNICATION SYSTEMS, INC. , HANEDA, Makoto , HANAWA, Hiroaki , HARASAWA, Katsuyoshi , YAMAHARA, Kenji
发明人： HITACHI, LTD. , HITACHI MICROCOMPUTER SYSTEM, LTD. , HITACHI COMMUNICATION SYSTEMS, INC.
IPC分类号： H04B10/14
CPC分类号： H04B10/25
摘要： In an optical transmission system using a point-multipoint transmission system, a controller for controlling the drive of an LD is provided in an optical transmitter installed in a subscriber's house; by means of the controller, the LD of the optical transmitter is usually set in a zero-bias state or in a reversely biased state; an on-hook signal sent from a telephone set or a computer connected to the optical transmitter when the telephone set or the computer is in an on-hook operation by the user is detected; and a forward bias current is made to flow through the LD based on the on-hook signal. Since the LD of the optical transmitter installed in the subscriber's house is set in a reversely biased or in a zero-bias state when it is in an on-hook operation, spontaneous emission components disappear from the LD of the optical transmitter. In addition, since a modulated current based on the data signal to be transmitted while the forward bias current flows to the LD is given through the LD, optical signals are outputted from the LD without light emission delay.
摘要翻译：在使用点对多点传输系统的光传输系统中，在安装在用户住宅内的光发射机中提供用于控制LD的驱动的控制器; 通过控制器，光发射机的LD通常设置为零偏置状态或反向偏置状态; 检测到当电话机或计算机处于用户的挂机操作时从电话机或连接到光发射机的计算机发送的挂机信号; 并且基于挂机信号使正向偏置电流流过LD。由于安装在用户住宅中的光发射机的LD在处于挂机操作时被设置为反偏置或零偏置状态，所以自发发射部件从光发射机的LD消失。此外，由于通过LD给出基于正向偏置电流流向LD的要发送的数据信号的调制电流，所以从LD输出光信号而没有发光延迟。

3. 发明申请

WO1995034954A1 SIGNAL RECEIVING CIRCUIT AND DIGITAL SIGNAL PROCESSING SYSTEM 审中-公开
标题翻译：信号接收电路和数字信号处理系统
公开(公告)号：WO1995034954A1
公开(公告)日：1995-12-21
申请号：PCT/JP1995001001
申请日：1995-05-25
申请人： HITACHI, LTD. , HITACHI COMMUNICATION SYSTEMS, INC. , KANAZAWA, Nobuaki , MIZUKAMI, Masao , ITO, Kunihiro
发明人： HITACHI, LTD. , HITACHI COMMUNICATION SYSTEMS, INC.
IPC分类号： H03K19/0185
CPC分类号： H04L25/0292 , H03K19/018521 , H03K19/018528
摘要： A signal receiving circuit comprising a first P-channel amplifiying MOSFET and a first N-channel amplifying MOSFET to the gates of which positive-phase signals inputted through a pair of signal transmission lines are fed and a second P-channel amplifying MOSFET and second N-channel amplifying MOSFET to the gates of which negative-phase signals inputted through the transmission lines are fed. A first output signal is generated adjusting the gains of the first P-channel MOSFET and second N-channel MOSFET, and the amplitude of the signal lies in nearly the middle part of the operating voltage. A second output signal is generated adjusting the gains of the second P-channel MOSFET and first N-channel MOSFET, and the amplitude of the signal lies in nearly the middle part of the operating voltage. Therefore, various kinds of small-amplitude signals can be received using a sense amplifier having only a fixed operating range in a signal receiving circuit constituted in the above-mentioned way and a novel optimum system can be constructed by combining semiconductor integrated circuit devices having different small-amplitude interfaces.
摘要翻译：一种信号接收电路，包括第一P沟道放大MOSFET和第一N沟道放大MOSFET，以通过一对信号传输线输入正相信号的栅极和第二P沟道放大MOSFET和第二N沟道放大MOSFET 通道放大MOSFET到通过传输线输入的负相位信号的栅极。产生第一输出信号，调节第一P沟道MOSFET和第二N沟道MOSFET的增益，信号幅度几乎位于工作电压的中间部分。产生调节第二P沟道MOSFET和第一N沟道MOSFET的增益的第二输出信号，并且信号的幅度几乎位于工作电压的中间部分。因此，可以使用在上述方式构成的信号接收电路中仅具有固定工作范围的读出放大器来接收各种小振幅信号，并且可以通过组合具有不同的半导体集成电路器件来构建新的最佳系统小振幅接口。

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