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79 条记录 (耗时 0.031 秒)

    Optical cross-connect apparatus
    31.
    发明授权
    Optical cross-connect apparatus 有权
    光交叉连接装置

    公开(公告)号：US06999648B2

    公开(公告)日：2006-02-14

    申请号：US10786082

    申请日：2004-02-26

    申请人： Yoichi Oikawa ,  Makoto Murakami ,  Takehisa Ishikawa

    发明人： Yoichi Oikawa ,  Makoto Murakami ,  Takehisa Ishikawa

    IPC分类号： G02B6/35 ,  G02B6/28 ,  H04J14/02

    CPC分类号： H04Q11/0005 ,  H04Q2011/0011 ,  H04Q2011/0016 ,  H04Q2011/002 ,  H04Q2011/0045 ,  H04Q2011/0049

    摘要： An optical cross-connect apparatus that realizes high throughput in optical cross-connection by performing large-scale switching. An input optical signal processing section converts wavelengths contained in each input WDM signal into wavelengths the number of which is equal to the number of WDM signals, compresses the pulse widths of the WDM signals by dividing the pulse widths by the number of the wavelengths contained in each input WDM signal, and performs a phase shift so that the phases of a plurality of compressed signal will not be the same. A wavelength switching section includes passive optical devices and distributes the optical signals processed by the input optical signal processing section according to wavelengths. An output optical signal processing section converts wavelengths contained in the optical signals distributed by the wavelength switching section into wavelengths recognized from the phases of the optical signals, expands the pulse widths of the optical signals, and outputs WDM signals.

    摘要翻译： 一种光交叉连接装置，通过进行大规模切换，实现光交叉连接中的高吞吐量。 输入光信号处理部分将每个输入WDM信号中包含的波长转换为数量等于WDM信号数的波长，通过将脉冲宽度除以波长数目的波长数来压缩WDM信号的脉冲宽度 每个输入WDM信号，并且执行相移，使得多个压缩信号的相位将不相同。 波长切换部分包括无源光学装置，并根据波长分配由输入光信号处理部分处理的光信号。 输出光信号处理部将由波长切换部分散的光信号中包含的波长变换为从光信号的相位识别的波长，扩大光信号的脉冲宽度，并输出WDM信号。

    Method of activating optical communication system, channel increasing/decreasing method, and computer-readable recording medium
    32.
    发明授权
    Method of activating optical communication system, channel increasing/decreasing method, and computer-readable recording medium 有权
    光通信系统的激活方法，信道增减方法以及计算机可读介质

    公开(公告)号：US06839160B2

    公开(公告)日：2005-01-04

    申请号：US10132326

    申请日：2002-04-26

    申请人： Takashi Tsuda ,  Kazuo Yamane ,  Makoto Murakami ,  Tooru Shima ,  Tooru Matsumoto ,  Hiroyuki Iwaki ,  Kazuto Imai

    发明人： Takashi Tsuda ,  Kazuo Yamane ,  Makoto Murakami ,  Tooru Shima ,  Tooru Matsumoto ,  Hiroyuki Iwaki ,  Kazuto Imai

    IPC分类号： H04B10/07 ,  H04B10/29 ,  H04B10/293 ,  H04B10/296 ,  H04B10/564 ,  H04B10/572 ,  H04J14/02 ,  G02F1/33 ,  H01S3/00 ,  H04B10/12

    CPC分类号： H04J14/0221 ,  H04B10/2942 ,  H04B2210/258 ,  H04J14/021 ,  H04J14/0213

    摘要： The invention relates to a method of activating an optical communication system comprising a plurality of optical amplifiers having an optical amplifier, between optical transmission lines in which wavelength-division multiplex optical signals are transmitted. The method comprises steps of: generating a desired slope in a desired wavelength range of a gain wavelength curve of the optical amplifier; adjusting an output of the optical amplifier to a desired output level; performing the above two steps in a plurality of optical repeater stations, the steps being carried out in sequence from the first to the last optical repeater stations; and adjusting a level in each optical signal in the wavelength-division multiplex optical signal so as to have substantially constant optical signal-to-noise ratios in the optical signals to be received. Activating the optical communication system according to this procedure allows proper execution of gain slope compensation, output control, and pre-emphasis control.

    摘要翻译： 本发明涉及一种激活光通信系统的方法，该光通信系统包括多个具有光放大器的光放大器，在其中传输波分复用光信号的光传输线之间。 该方法包括以下步骤：在光放大器的增益波长曲线的期望波长范围内产生期望的斜率; 将所述光放大器的输出调节到期望的输出电平; 在多个光学中继站中执行上述两个步骤，该步骤是从第一个到最后一个光中继站进行的; 并调整波分多路复用光信号中的每个光信号的电平，使得要接收的光信号中的光信噪比基本上恒定。 根据该程序激活光通信系统允许正确执行增益斜率补偿，输出控制和预加重控制。

    Optical transmission system
    34.
    发明授权
    Optical transmission system 有权
    光传输系统

    公开(公告)号：US06307985B1

    公开(公告)日：2001-10-23

    申请号：US09348838

    申请日：1999-07-08

    申请人： Makoto Murakami ,  Hideki Maeda ,  Takamasa Imai

    发明人： Makoto Murakami ,  Hideki Maeda ,  Takamasa Imai

    IPC分类号： G02B602

    CPC分类号： H04B10/25253

    摘要： It is the objective of the present invention to resolve the limitations on transmission capacity and distance in a system by means of a simple design, through the provision of a means for restraining the deterioration in transmission characteristics that is the result of accumulation over the entire system of third order dispersion in the optical fiber. In the present invention, there is provided an optical fiber transmission path in which positive dispersion fibers 40,46,52, and 54 and negative dispersion fibers 42,48 (referred to as optical fibers hereinafter), which have at least second and third order dispersion of mutually opposite signs, are combined. In addition, the optical fiber is disposed so that the average third order dispersion value on the transmission path overall is reduced, and so the length of each optical fiber is sufficiently smaller than the square root of the product of the second order dispersion length, which is determined from the second order dispersion value of the optical fiber and the pulse width of the signal, and the non-linear length, which is determined from the average power of the signal within the optical fiber and the optical fiber nonlinear coefficient.

    摘要翻译： 本发明的目的是通过简单的设计来解决系统中的传输容量和距离的限制，通过提供一种用于抑制作为在整个系统上累积的结果的传输特性的劣化的装置 的光纤中的三阶色散。 在本发明中，提供了一种光纤传输路径，其中正色散光纤40,46,52和54以及负色散光纤42,48（以下称为光纤）至少具有第二和第三级 相互相反的符号的分散相结合。 此外，光纤被布置成使得传输路径总体上的平均三阶色散值减小，因此每条光纤的长度足够小于二阶色散长度的乘积的平方根，其中 根据光纤的二阶色散值和信号的脉冲宽度以及由光纤内的信号的平均功率和光纤非线性系数确定的非线性长度来确定。

    Frequency spectrum analyzing apparatus
    36.
    发明授权
    Frequency spectrum analyzing apparatus 有权
    频谱分析装置

    公开(公告)号：US08725463B2

    公开(公告)日：2014-05-13

    申请号：US13120433

    申请日：2009-09-09

    申请人： Natsuko Kitamura ,  Yoshiaki Akimoto ,  Jiro Takagi ,  Atsushi Kurauchi ,  Masayuki Yoshiiri ,  Hirotaka Komatsu ,  Kazuhiko Hirota ,  Makoto Murakami

    发明人： Natsuko Kitamura ,  Yoshiaki Akimoto ,  Jiro Takagi ,  Atsushi Kurauchi ,  Masayuki Yoshiiri ,  Hirotaka Komatsu ,  Kazuhiko Hirota ,  Makoto Murakami

    IPC分类号： G01R23/16 ,  G06F17/00 ,  G06F19/00 ,  G01L23/22 ,  G05B15/00

    CPC分类号： G01R23/16 ,  G01L23/221 ,  G01L23/225 ,  G01M15/12 ,  G05B15/00 ,  G06F17/00 ,  G06F19/00

    摘要： A frequency spectrum analyzing apparatus for performing a frequency spectrum analysis with respect to a detected value of an operating parameter of an internal combustion engine in synchronism with rotation of the engine, is provided. The operating parameter is sampled at predetermined time intervals, and a sampled value is converted to a digital value. Intensities of first and second elements are calculated with respect to a predetermined number of the sampled values. The first elements and second elements respectively correspond to a plurality of frequency components contained in the detected value, and a phase of the second element differs from a phase of the first element by 90 degrees. Frequency component intensities corresponding to the plurality of frequency components are calculated in synchronism with rotation of the engine, using the first element intensities and the second element intensities. The frequency component intensities are calculated by replacing a part of an integrated value of the first element intensities, and a part of an integrated value of the second element intensities respectively with corresponding preceding calculated values, when an rotational speed of the engine is higher than or equal to a set threshold value.

    摘要翻译： 提供了一种频谱分析装置，用于与发动机的旋转同步地执行关于内燃机的操作参数的检测值的频谱分析。 以预定的时间间隔对操作参数进行采样，并将采样值转换为数字值。 相对于预定数量的采样值来计算第一和第二元素的强度。 第一元件和第二元件分别对应于包含在检测值中的多个频率分量，并且第二元件的相位与第一元件的相位不同90度。 使用第一元件强度和第二元件强度，与发动机的旋转同步地计算与多个频率分量对应的频率分量强度。 通过将发动机的转速高于或等于的第一元件强度的积分值的一部分和第二元件强度的积分值的一部分分别与相应的先前计算值相对应地计算频率分量强度， 等于设定的阈值。

    Positioning signal reception device and control method of positioning signal reception device
    38.
    发明授权
    Positioning signal reception device and control method of positioning signal reception device 有权

    公开(公告)号：US08619929B2

    公开(公告)日：2013-12-31

    申请号：US12574221

    申请日：2009-10-06

    申请人： Makoto Murakami

    发明人： Makoto Murakami

    IPC分类号： H04B1/10

    CPC分类号： H04B1/7097 ,  G01S19/21 ,  G01S19/30

    摘要： A positioning signal reception device receives a positioning signal transmitted from a position information satellite, and includes: a signal reception portion that obtains a reception signal by receiving the positioning signal; an A/D conversion portion that generates a digital signal by converting the reception signal into a digital form; a filter portion that subjects the digital signal to frequency separation, a characteristic of the filter portion being changeable; a filter characteristic change portion that changes the characteristic of the filter portion according to an operating state of the positioning signal reception device and an external environmental condition of the positioning signal reception device; and a code synchronization establishment portion that establishes synchronization of spreading codes contained in the reception signal.

    Multipath signal determination method, signal suitability determination method, positioning operation method, program, and multipath signal determination circuit
    40.
    发明授权
    Multipath signal determination method, signal suitability determination method, positioning operation method, program, and multipath signal determination circuit 有权
    多路径信号判定方法，信号适应性判定方法，定位运算方法，程序和多径信号判定电路

    公开(公告)号：US08300678B2

    公开(公告)日：2012-10-30

    申请号：US12326347

    申请日：2008-12-02

    申请人： Makoto Murakami

    发明人： Makoto Murakami

    IPC分类号： H04B1/00

    CPC分类号： H04B1/7113 ,  G01S19/22 ,  G01S19/27 ,  G01S19/37 ,  H04B2201/70715

    摘要： A multipath signal determination method includes carrying out correlation operation between a received signal of a positioning signal spread-modulated with a spread code and a replica signal of the spread code with respect to each of IQ components at a predetermined sampling phase interval, and determining whether the received signal is a multipath signal or not, in accordance with a plot position in the case where each correlation value in each of the sampling phases is sequentially plotted on an IQ coordinate.

    摘要翻译： 多路径信号判定方法包括以预定的采样相位间隔对扩频码的扩频调制的接收信号和扩频码的复制信号进行相关运算，并确定是否 根据在每个采样相位中的每个相关值被顺序地绘制在IQ坐标上的情况下的绘图位置，所接收的信号是否为多径信号。