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21 条记录 (耗时 0.018 秒)

    SIGNAL GENERATION CIRCUIT, OPTICAL SIGNAL TRANSMITTER, SIGNAL RECEPTION CIRCUIT, OPTICAL SIGNAL SYNCHRONIZATION ESTABLISHMENT METHOD, AND OPTICAL SIGNAL SYNCHRONIZATION SYSTEM
    5.
    发明公开
    SIGNAL GENERATION CIRCUIT, OPTICAL SIGNAL TRANSMITTER, SIGNAL RECEPTION CIRCUIT, OPTICAL SIGNAL SYNCHRONIZATION ESTABLISHMENT METHOD, AND OPTICAL SIGNAL SYNCHRONIZATION SYSTEM 有权
    信号产生电路支持光信号，信号接收电路，方法同步光学信号和系统同步的光信号

    公开(公告)号：EP2434665A1

    公开(公告)日：2012-03-28

    申请号：EP10777559.5

    申请日：2010-05-18

    申请人： Nippon Telegraph And Telephone Corporation

    发明人： ISHIHARA, Koichi ,  KOBAYASHI, Takayuki ,  KUDO, Riichi ,  TAKATORI, Yasushi ,  MATSUI, Munehiro ,  MIZOGUCHI, Masato ,  SANO, Akihide ,  YAMANAKA, Shogo ,  YAMAZAKI, Etsushi ,  MIYAMOTO, Yutaka ,  YOSHIDA, Eiji ,  NAKAGAWA, Tadao

    IPC分类号： H04B10/04 ,  H04B10/02 ,  H04B10/06 ,  H04B10/14 ,  H04B10/18 ,  H04B10/26 ,  H04B10/28 ,  H04L7/08

    CPC分类号： H04B10/50 ,  H04B10/07951 ,  H04B10/2513 ,  H04B10/556 ,  H04B10/616 ,  H04B10/6161 ,  H04L7/027

    摘要： To enable signal position detection, frequency offset compensation, clock offset compensation, and chromatic dispersion amount estimation in a communication system based on coherent detection using an optical signal, even on a signal having a great offset in an arrival time depending on a frequency due to chromatic dispersion. An optical signal transmitting apparatus generates specific frequency band signals having power concentrated on two or more specific frequencies and transmits a signal including the specific frequency band signals. An optical signal receiving apparatus converts a received signal into a digital signal, detects positions of the specific frequency band signals from the converted digital signal, estimates frequency positions of the detected specific frequency band signals, and detects a frequency offset between an optical signal receiving apparatus and an optical signal transmitting apparatus. Moreover, the optical signal receiving apparatus detects a clock offset between the optical signal receiving apparatus and the optical signal transmitting apparatus from an interval between the estimated frequency positions of the specific frequency band signals. Furthermore, the optical signal receiving apparatus estimates temporal positions of the detected specific frequency band signals and detects a chromatic dispersion amount from a difference between the temporal positions of the specific frequency band signals corresponding to different frequencies.

    摘要翻译： 基于使用光学信号相干检测使得能够在通信系统中信号的位置检测，频率偏移补偿，时钟偏移补偿，而色散量估计，即使在信号具有大的到达时间偏移依赖于频率由于 色散。 一种光信号发送装置基因率具有功率的特定频带的信号集中在两个或更多个特定频率，并发送一个信号包括特定频带信号。 的光信号接收装置接收到的信号转换成数字信号转换，检测从转换后的数字信号的特定频带信号的位置，估计检测到的特定频带信号的频率位置，并检测频率在光信号接收装置之间的偏移 和光信号发送装置。 更完了，光信号接收装置检测一个时钟光信号接收装置，并从所述特定频带的信号的估计的频率位置之间的间隔的光信号发送装置之间的时间偏移。 进一步地，光信号接收装置估计检测到的特定频带信号的时间位置和色散从特定频带信号对应于不同频率的时间位置之间的差来检测量。

    OPTICAL TRANSMISSION SYSTEM AND METHOD
    6.
    发明公开
    OPTICAL TRANSMISSION SYSTEM AND METHOD 审中-公开
    OPTISCHESÜBERTRAGUNGSSYSTEMUND VERFAHREN

    公开(公告)号：EP1965528A1

    公开(公告)日：2008-09-03

    申请号：EP06835092.5

    申请日：2006-12-21

    申请人： NIPPON TELEGRAPH AND TELEPHONE CORPORATION ,  NTT ELECTRONICS CORPORATION

    发明人： KISAKA, Yoshiaki ,  AISAWA, Shigeki ,  MIYAMOTO, Yutaka ,  TOMIZAWA, Masahito ,  ENDOH, Yasuyuki ,  TAKEI, Kazuhito

    IPC分类号： H04J3/00 ,  H04J14/00 ,  H04J14/02 ,  H04L12/28 ,  H04L12/56

    CPC分类号： H04J3/1652 ,  H04J3/07 ,  H04J2203/0085

    摘要： An optical transmission system for performing frequency synchronization even with a client signal with low frequency accuracy, and for transmitting thereof by accommodating/multiplexing without causing a bit slip. A new overhead is added to the entire client signal, and the signal including the new overhead being stuffed is transmitted in conjunction with a plurality of stuffing bits as an optical signal wherein a data storing bit for a negative stuffing, a stuffing information notification bit, and a stuff bits inserting bit for a positive stuffing in the payload are defined in plurality as stuffing bits for adjusting clock frequencies of the client signal in this new overhead.

    摘要翻译： 一种即使使用低频精度的客户端信号进行频率同步的光传输系统，也可以通过容纳/多路复用而不产生位滑动进行发送。 在整个客户端信号中增加新的开销，并且包括填充的新开销的信号与多个填充位一起作为光信号发送，其中，用于负填充的数据存储位，填充信息通知位， 并且用于在有效载荷中的正填充的填充比特插入位被定义为多个作为填充位，用于在该新开销中调整客户端信号的时钟频率。

    OPTICAL OFDM RECEIVER, OPTICAL TRANSMISSION SYSTEM, SUBCARRIER SEPARATION CIRCUIT, AND SUBCARRIER SEPARATION METHOD
    8.
    发明公开
    OPTICAL OFDM RECEIVER, OPTICAL TRANSMISSION SYSTEM, SUBCARRIER SEPARATION CIRCUIT, AND SUBCARRIER SEPARATION METHOD 有权
    Optischer OFDM-Empfänger，Unterträger-Trennschaltung，Unterträger-Trennverfahren und System

    公开(公告)号：EP2247012A1

    公开(公告)日：2010-11-03

    申请号：EP09713045.4

    申请日：2009-02-20

    申请人： Nippon Telegraph And Telephone Corporation

    发明人： SANO, Akihide ,  YAMADA, Eiichi ,  KOBAYASHI, Takayuki ,  ISHIHARA, Koichi ,  MIYAMOTO, Yutaka ,  KUDO, Riichi

    IPC分类号： H04J14/00 ,  G02F2/00 ,  H04J11/00 ,  H04J14/04 ,  H04J14/06

    CPC分类号： H04B10/69 ,  H04L25/0305 ,  H04L25/03159 ,  H04L27/2647 ,  H04L27/2697

    摘要： A high-performance optical OFDM receiver is realized. A subcarrier separation circuit receives an optical OFDM signal consisting of two subcarriers A and B and separates a subcarrier component, signal light and first local oscillator light are input to the subcarrier separation circuit, the subcarrier separation circuit converts the signal light and the first local oscillator into a baseband electrical signal, the subcarrier separation circuit converts the baseband electrical signal into a digital signal, the subcarrier separation circuit shifts the frequency of the converted digital signal so that a center frequency of the subcarrier A becomes zero, and the subcarrier separation circuit adds a frequency shifted signal to a signal obtained by delaying the frequency shifted signal by 1/2 of a symbol time to separate a component of the subcarrier A.

    摘要翻译： 实现了高性能的光OFDM接收机。 子载波分离电路接收由两个子载波A和B组成的光OFDM信号，并将子载波分量，信号光和第一本地振荡光分离为副载波分离电路，副载波分离电路将信号光和第一本机振荡器 子载波分离电路转换为基带电信号，将基带电信号转换为数字信号，副载波分离电路使转换的数字信号的频率移位，使副载波A的中心频率为零，副载波分离电路 通过将频移信号延迟1/2个符号时间而分离子载波A的分量而获得的信号的频移信号。

    OPTICAL MODULATION CIRCUIT AND OPTICAL TRANSMISSION SYSTEM
    9.
    发明公开
    OPTICAL MODULATION CIRCUIT AND OPTICAL TRANSMISSION SYSTEM 有权
    OPTISCHE MODULATIONSSCHALTUNG UND OPTISCHESÜBERTRAGUNGSSYSTEM

    公开(公告)号：EP2166681A1

    公开(公告)日：2010-03-24

    申请号：EP08777897.3

    申请日：2008-07-04

    申请人： Nippon Telegraph and Telephone Corporation

    发明人： KOBAYASHI, Takayuki ,  SANO, Akihide ,  MIYAMOTO, Yutaka

    IPC分类号： H04B10/04 ,  G02F1/01 ,  H04B10/02 ,  H04B10/06 ,  H04B10/142 ,  H04B10/152 ,  H04B10/18 ,  H04J14/00 ,  H04J14/02

    CPC分类号： H04B10/5053 ,  G02F1/0327 ,  G02F1/225 ,  H04B10/548 ,  H04B10/5561

    摘要： An optical modulator and an optical transmission system convert continuous light of a multiple wavelength light source, which generates the continuous light with a fixed and complete phase but different frequencies, to a modulator driving signal so as to generate a light subcarrier with each frequency at the center and modulate the continuous light to the light subcarrier by using the modulator driving signal. In the case where an optical modulation is carried out by an optical IQ-modulator, transmitting data, for example, is converted to two parallel data A(t) and B(t), an I phase signal, in which the data A(t)+B(t) are modulated with a clock signal with a frequency ω, and a Q phase signal, in which the data A(t)-B(t) are modulated with a clock signal with a π/2 phase shifted, are generated, and the I phase signal and the Q phase signal are applied to electrodes of the optical IQ-modulator, respectively.

    摘要翻译： 光调制器和光传输系统将多个波长光源的连续光转换成具有固定且完全相位不同的频率的连续光，以调制器驱动信号，以便产生具有每个频率的光副载波 通过使用调制器驱动信号将连续光调制到光副载波上。 在通过光学IQ调制器进行光调制的情况下，例如将数据转换成两个并行数据A（t）和B（t），I相信号，其中数据A（ t）+ B（t）用具有频率É的时钟信号和Q相信号进行调制，其中数据A（t）-B（t）用具有π/ 2相移的时钟信号 ，并且将I相信号和Q相位信号分别施加到光学IQ调制器的电极。