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    Optical transmission system
    51.
    发明授权
    Optical transmission system 失效
    光传输系统

    公开(公告)号：US06377373B1

    公开(公告)日：2002-04-23

    申请号：US09118732

    申请日：1998-07-17

    申请人： Toshio Kawazawa ,  Koji Goto

    发明人： Toshio Kawazawa ,  Koji Goto

    IPC分类号： H04J1402

    CPC分类号： H04B10/27 ,  H04B10/278

    摘要： In an optical transmission, system, a trunk cable having two pairs of optical fibers is provided between first and second trunk stations to use one of the two pairs of the optical fibers for communication between the first and second trunk stations and the other for communication with first and second branch stations. Two branching units of first and second, and third and forth, are respectively provided for the first and second branch stations, and connected to each of the associated first and second branch stations, by first and second or third and forth branching cables. The first branch station connects to the first branching unit via the first branching cable having two pairs of optical fibers, and connects to the second branching unit via the second branching cable having two pairs of optical fibers. One of the two pairs of the optical fibers of the first branching cable and one of the two pairs of the optical fibers of the second branching cable are normally used, and the others are reserved as spare fibers. Alternatively, the first branching cable is normally used, and the second branching cable is reserved as a spare cable.

    摘要翻译： 在光传输系统中，在第一和第二中继站之间提供具有两对光纤对的中继电缆，以使用两对光纤中的一对用于第一和第二干线站之间的通信，另一对用于与 第一和第二分支站。 第一和第二和第三和第四分支单元分别设置用于第一和第二分支站，并通过第一和第二或第三和第四和第四分支电缆连接到相关联的第一和第二分支站中的每一个。 第一分支站通过具有两对光纤的第一分支电缆连接到第一分支单元，并经由具有两对光纤的第二分支电缆连接到第二分支单元。 通常使用第一分支电缆的两对光纤中的一对光纤和第二分支电缆的两对光纤中的一对，其他光纤被保留为备用光纤。 或者，通常使用第一分支电缆，并且将第二分支电缆预留为备用电缆。

    Dispersion compensation device
    52.
    发明授权
    Dispersion compensation device 失效
    色散补偿装置

    公开(公告)号：US06292603B1

    公开(公告)日：2001-09-18

    申请号：US09207419

    申请日：1998-12-08

    申请人： Takashi Mizuochi ,  Tadayoshi Kitayama ,  Hideaki Tanaka ,  Koji Goto

    发明人： Takashi Mizuochi ,  Tadayoshi Kitayama ,  Hideaki Tanaka ,  Koji Goto

    IPC分类号： G02B628

    CPC分类号： G02B6/12007 ,  G02B6/2932 ,  G02B6/29353 ,  G02B6/29377 ,  G02B6/29394 ,  H04B10/2519 ,  H04B2210/252 ,  H04B2210/254

    摘要： A dispersion compensation device comprises a chirped grating, and a first optical unit for guiding at least a lightwave signal with a wavelength of &lgr;i that needs a positive dispersion compensation and is applied thereto to one end portion of the chirped grating whose grating pitch is shorter, and for furnishing light reflected by the chirped grating to outside the device. The device further comprises a second optical unit for guiding at least a lightwave signal with a wavelength of &lgr;i that needs a negative dispersion compensation and is applied thereto to another end portion of the chirped grating whose grating pitch is longer, and for furnishing light reflected by the chirped grating to outside the device. Both the first and second optical units can be either optical circulators or optical couplers.

    摘要翻译： 色散补偿装置包括啁啾光栅和第一光学单元，用于至少引导具有需要正色散补偿的兰姆波长的至少一个光波信号，并将其施加到其光栅间距较短的啁啾光栅的一个端部， 并将由啁啾光栅反射的光提供到设备外部。 该装置还包括第二光学单元，用于至少引导具有需要负色散补偿的兰姆波长的至少一个光波信号，并将其施加到光栅间距较长的啁啾光栅的另一端部，并且用于提供由 啁啾光栅到设备外部。 第一和第二光学单元都可以是光学循环器或光耦合器。

    Radio terminal device for automatically correcting phase difference between a received signal and an internally generated signal
    54.
    发明授权
    Radio terminal device for automatically correcting phase difference between a received signal and an internally generated signal 失效
    无线终端装置，用于自动校正接收信号和内部产生的信号之间的相位差

    公开(公告)号：US06236843B1

    公开(公告)日：2001-05-22

    申请号：US09106842

    申请日：1998-06-30

    申请人： Koji Goto

    发明人： Koji Goto

    IPC分类号： H04B106

    CPC分类号： H03K3/0307 ,  H03J5/246 ,  H03L7/0891 ,  H03L7/099 ,  H03L7/0991

    摘要： Radio terminal equipment is provided with an oscillator connected to a receiving circuit, a DPLL 16 for detecting and correcting the phase difference between the received frequency and the oscillation frequency of the oscillator, a switch for connecting a capacitor to or disconnecting from the oscillator, and control means 17 for effecting ON-OFF control of the switch based on the output signal from the DPLL 16.

    摘要翻译： 无线终端设备设置有连接到接收电路的振荡器，用于检测和校正接收频率与振荡器的振荡频率之间的相位差的DPLL 16，用于将电容器连接到振荡器或从振荡器断开的开关，以及 控制装置17，用于根据来自DPLL16的输出信号进行开关的ON-OFF控制。

    Demultiplexer device for wavelength-division multiplexed optical fiber communication
    55.
    发明授权
    Demultiplexer device for wavelength-division multiplexed optical fiber communication 失效
    用于波分复用光纤通信的解复用器件

    公开(公告)号：US6115156A

    公开(公告)日：2000-09-05

    申请号：US964528

    申请日：1997-11-05

    申请人： Tomohiro Otani ,  Toshio Kawazawa ,  Koji Goto ,  Hiroharu Wakabayashi

    发明人： Tomohiro Otani ,  Toshio Kawazawa ,  Koji Goto ,  Hiroharu Wakabayashi

    IPC分类号： G02B6/28 ,  H04B10/2507 ,  H04B10/2519 ,  H04B10/27 ,  H04B10/29 ,  H04J14/00 ,  H04J14/02

    CPC分类号： H04B10/2941 ,  H04B10/2519 ,  H04J14/02 ,  H04B2210/252 ,  H04B2210/258 ,  H04J14/0221

    摘要： A demultiplexer device is used in a wavelength-division multiplexed optical fiber communication line to achieve efficient dispersion compensation and loss compensation as well as a reduction of active devices such as optical amplifiers. The demultiplexer device has a series of couplers disposed in multi-stages from the input of the demultiplexer. Each coupler has two branches with one branch of each coupler connected to a separate optical filter and the other branches are series connected to a subsequent stage of the couplers through equalizing fibers, except for the final stage which has its second branch connected to an optical filter for the shortest wavelength transmitted. The equalizing fibers are thus serially connected between couplers and act to perform a cumulative dispersion compensation. The quantity of the equalizing fibers can thus be reduced as a whole, and as a result the attenuation amount also decreases, so that the number of optical amplifiers can be reduced.

    摘要翻译： 解复用器装置用于波分复用光纤通信线路中，以实现有效的色散补偿和损耗补偿以及减少诸如光放大器之类的有源器件。 多路分解器装置具有从多路分解器的输入端以多级布置的一系列耦合器。 每个耦合器具有两个分支，每个耦合器的一个分支连接到单独的滤光器，并且其它分支通过均衡纤维串联连接到耦合器的后续阶段，除了最后一级，其第二分支连接到滤光器 对于最短的波长传输。 均衡纤维因此串联连接在耦合器之间并用于执行累积色散补偿。 因此，均匀纤维的量可以整体上减少，结果衰减量也减小，从而可以减少光放大器的数量。

    Reception data expander having noise reduced in generation of reception data error
    56.
    发明授权
    Reception data expander having noise reduced in generation of reception data error 失效
    接收数据扩展器在产生接收数据错误时具有降低的噪声

    公开(公告)号：US5925146A

    公开(公告)日：1999-07-20

    申请号：US924503

    申请日：1997-09-05

    申请人： Kenji Murata ,  Koji Goto

    发明人： Kenji Murata ,  Koji Goto

    IPC分类号： G10L19/00 ,  H04B14/04 ,  H04B14/06 ,  G06F11/00

    CPC分类号： H04B14/068

    摘要： A reception data expander includes: an adaptive differential pulse code modulation (ADPCM) decoder activated when error detection information attains a reception data error nondetected state for expanding an input ADPCM code into a PCM (pulse code modulation) code, and inhibited of its decoding process operation when the error detection information indicates an error detected state; a memory circuit set to a write state when the error detection information attains an error nondetected state for sequentially storing generated ADPCM code, and outputting a stored PCM code when the error detection information is rendered to an error detected state; and a reconstructed output switch for selecting and providing to the next PCM decoder a PCM code when the error detection information attains an error nondetected state, and a PCM code read out from the memory circuit when the error detection information attains an error detected state. Noise generation arising from discontinuity of an ADPCM code at the time of reception data generation can be suppressed effectively without increasing the device complexity and power consumption.

    摘要翻译： 接收数据扩展器包括：当错误检测信息达到用于将输入的ADPCM码扩展为PCM（脉冲编码调制）码的接收数据错误非检测状态时激活的自适应差分脉冲编码调制（ADPCM）解码器，并且禁止其解码处理 当错误检测信息指示错误检测状态时的操作; 当错误检测信息达到用于顺序存储所生成的ADPCM代码的错误检测状态时，设置为写入状态的存储器电路，并且当将错误检测信息呈现为错误检测状态时，输出存储的PCM代码; 以及重构输出开关，用于当错误检测信息达到错误检测状态时，向下一PCM解码器提供PCM代码，以及当错误检测信息达到错误检测状态时从存储器电路读出的PCM代码。 可以有效地抑制在接收数据生成时由ADPCM码的不连续性引起的噪声产生，而不会增加器件的复杂度和功耗。

    Operating circuit and method for processing signals in ADPCM system
    57.
    发明授权
    Operating circuit and method for processing signals in ADPCM system 失效
    ADPCM系统处理信号的工作电路及方法

    公开(公告)号：US5764941A

    公开(公告)日：1998-06-09

    申请号：US580085

    申请日：1995-12-20

    申请人： Koji Goto ,  Satoru Kinoshita

    发明人： Koji Goto ,  Satoru Kinoshita

    IPC分类号： G06F9/32 ,  G06F9/355

    CPC分类号： G06F9/324 ,  G06F9/30058

    摘要： An operating circuit carrying out a conditional branch to judge a value level of a calculated result output from an arithmetic logic unit (ALU) during one machine cycle, using an address unit, realizes shorter processing time and low power consumption. The operating circuit sequentially carries out calculations according to command codes in a command ROM and includes a result register for storing and outputting the calculated result of the ALU; a value level judgement mechanism for judging a value level of an output of the result register; a latch for storing a current value of a program counter; an adder for calculating a next value of a program counter by adding a value level judgement result from the value level judgement mechanism and a current value of the program counter stored in the latch; and a first selector for selecting an added result and for deciding a next command address in the command ROM, a conditional branch being carried out to a command address corresponding to a value level obtained for the calculated result from the ALU.

    摘要翻译： 在一个机器周期期间使用地址单元执行条件分支以判断从算术逻辑单元（ALU）输出的计算结果的值水平的操作电路实现较短的处理时间和低功耗。 操作电路根据命令ROM中的命令码依次执行计算，并包括用于存储和输出ALU的计算结果的结果寄存器; 用于判断结果寄存器的输出的值电平的值电平判断机构; 用于存储程序计数器的当前值的锁存器; 加法器，用于通过从值电平判断机构添加值电平判断结果和存储在锁存器中的程序计数器的当前值来计算程序计数器的下一值; 以及第一选择器，用于选择附加结果并用于决定命令ROM中的下一个命令地址，条件分支被执行到与从ALU获得的计算结果获得的值水平相对应的命令地址。