公开(公告)号：US06587242B1

公开(公告)日：2003-07-01

申请号：US09422726

申请日：1999-10-22

申请人： Ippei Shake ,  Hidehiko Takara ,  Yoshiaki Yamabayashi ,  Osamu Kamatani ,  Koji Nonaka ,  Kentaro Uchiyama

发明人： Ippei Shake ,  Hidehiko Takara ,  Yoshiaki Yamabayashi ,  Osamu Kamatani ,  Koji Nonaka ,  Kentaro Uchiyama

IPC分类号： H04J1408

CPC分类号： H04B10/25133 ,  H04B10/0775 ,  H04B2210/072 ,  H04B2210/078 ,  H04B2210/252 ,  H04B2210/258 ,  H04J14/08

摘要： It is the object of the present invention to provide a transmission system that transmits a control signal corresponding to the overhead accommodating time division multiplexing information at a frequency that is the same (or nearly the same) as that of the main signal. In order to attain this object, an optical transmitter broadens in a time range the optical waveform of the OTDM signal having a wavelength &lgr;0 and the control light having a wavelength &lgr;1(≈&lgr;0), and multiplexes the signal light having an optical peak intensity set low compared to the OTDM signal peak intensity and sending this to an optical transmission fiber. An optical receiver provides a light splitting means that splits into two parts the transmitted OTDM signal and the control light and outputs one part thereof to an optical time division multiplexing means, and at the same time restores the control light included in the other part of the light to the original optical pulse train, and extracts the control information by converting this to an electric signal.

摘要翻译： 本发明的目的是提供一种传输系统，其以与主信号相同（或接近相同）的频率发送对应于开销容纳时分复用信息的控制信号。 为了实现该目的，光发射机在时间范围内扩大了具有波长lambd0的OTDM信号的光波形和具有波长lambd1（≈lambd0）的控制光，并且复用具有光峰值强度集合的信号光 与OTDM信号峰值强度相比较低，并将其发送到光传输光纤。 光接收器提供一种分光装置，其将发射的OTDM信号和控制光分成两部分，并将其一部分输出到光时分多路复用装置，并且同时恢复包含在其中的控制光 对原始光脉冲序列进行光照射，并通过将其转换为电信号来提取控制信息。

公开(公告)号：US06396601B1

公开(公告)日：2002-05-28

申请号：US09204001

申请日：1998-12-01

申请人： Hidehiko Takara ,  Yoshiaki Yamabayashi ,  Ippei Shake

发明人： Hidehiko Takara ,  Yoshiaki Yamabayashi ,  Ippei Shake

IPC分类号： H04B1008

CPC分类号： H04B10/07953

摘要： An optical signal quality monitoring system is provided, by which the quality of optical signals can be examined using a single monitoring system, not depending on the bit rate of each signal. In the system, an optical signal having a bit rate N·f0, that is, N times as much as basic clock frequency f0, is sampled by using a pulse repetition frequency f0/n1−&Dgr;f or f0/n1+&Dgr;f where n1 is a predetermined natural number and the pulse repetition frequency slightly differs from f0/n1 by &Dgr;f, and an amplitude histogram of the optical signal is determined based on results of the sampling. Regarding the sampling points which constitute the histogram, a set of higher-level points and a set of lower-level points are extracted and a ratio of a difference between an average level of the set of higher-level points within a predetermined period and an average level of the set of lower-level points within a predetermined period, to the sum of standard deviations of both sets within each predetermined period is calculated as a coefficient of the S/N, and the quality of the optical signal is examined based on the coefficient. By performing optical sampling, quality of optical signals having bit rates of a few dozen Gbit/s or more can be monitored.

摘要翻译： 提供了一种光信号质量监测系统，通过该光信号质量监测系统，可以使用单个监控系统检查光信号的质量，而不依赖于每个信号的比特率。 在该系统中，通过使用脉冲重复频率f0 / n1-DELTAf或f0 / n1 + DELTAf对具有比特率N.f0，即基本时钟频率f0的N倍的光信号进行采样，其中n1是 预定的自然数，脉冲重复频率与f0 / n1与DELTAf略有不同，根据采样结果确定光信号的振幅直方图。 关于构成直方图的采样点，提取一组较高级别点和一组较低级别点，并且在预定时间段内的上一级点的平均电平和 将预定时间段内的下一级集合的平均电平相对于每个预定周期内的两组的标准偏差之和计算为S / N的系数，并且基于 系数。 通过进行光采样，可以监视具有几十Gbit / s以上的比特率的光信号的质量。

公开(公告)号：US5995228A

公开(公告)日：1999-11-30

申请号：US250089

申请日：1999-02-16

申请人： Akihito Otani ,  Toshinobu Otsubo ,  Hidehiko Takara ,  Satoki Kawanishi ,  Yoshiaki Yamabayashi

发明人： Akihito Otani ,  Toshinobu Otsubo ,  Hidehiko Takara ,  Satoki Kawanishi ,  Yoshiaki Yamabayashi

IPC分类号： G01M11/02 ,  G01J4/00 ,  G01J7/00 ,  G01J9/02 ,  G01M11/00 ,  G01J4/04

CPC分类号： G01M11/336 ,  G01J4/00 ,  G01J7/00 ,  G01M11/332 ,  G01M11/335 ,  G01J2009/0261

摘要： A first tunable wavelength pulse light source is driven by a reference signal to emit a first optical pulse. An optical demultiplexer demultiplexes a first optical pulse emitted from the first pulse light source into a reference optical pulse and an incident optical pulse to be sent into an object to be measured. An optical multiplexer multiplexes the reference optical pulse and an outgoing optical pulse passing through the object to output multiplexed light. A second pulse light source generates a second optical pulse which is synchronous with the first optical pulse and delays a predetermined time for each period of the first optical pulse. A sampling unit receives the multiplexed light and the second optical pulse to obtain an optical pulse train signal proportional to the intensity of the multiplexed light obtained in synchronism with the second optical pulse. From the optical pulse train signal from the sampling unit, a signal processor obtains an envelope formed by peaks of individual optical pulses forming the optical pulse train. The wavelength dispersion of the object is obtained by measuring the delay time of the outgoing optical pulse passing through the object on the basis of intervals between the peaks of the envelope.

摘要翻译： 第一可调波长脉冲光源由参考信号驱动以发射第一光脉冲。 光解复用器将从第一脉冲光源发射的第一光脉冲解复用为参考光脉冲和入射光脉冲，以发送到待测物体中。 光复用器复用参考光脉冲和通过物体的输出光脉冲以输出多路复用光。 第二脉冲光源产生与第一光脉冲同步的第二光脉冲，并延迟第一光脉冲的每个周期的预定时间。 采样单元接收复用光和第二光脉冲，以获得与与第二光脉冲同步获得的多路复用光的强度成比例的光脉冲串信号。 从采样单元的光脉冲信号中，信号处理器获得由形成光脉冲串的各个光脉冲的峰值形成的包络。 通过基于信封的峰值之间的间隔测量通过物体的输出光脉冲的延迟时间来获得物体的波长色散。

公开(公告)号：US5574717A

公开(公告)日：1996-11-12

申请号：US442145

申请日：1995-05-16

申请人： Masahito Tomizawa ,  Yoshiaki Yamabayashi ,  Yukio Kobayashi ,  Kiyoshi Nakagawa ,  Ken-ichi Yagisawa

发明人： Masahito Tomizawa ,  Yoshiaki Yamabayashi ,  Yukio Kobayashi ,  Kiyoshi Nakagawa ,  Ken-ichi Yagisawa

IPC分类号： H03M13/00 ,  H03M13/15 ,  H04J3/14 ,  H04Q11/04 ,  H04L1/00

CPC分类号： H04J3/14 ,  H03M13/00 ,  H03M13/151 ,  H04J2203/0089

摘要： In an optical transmission system applicable to a SDH network, communication between two line terminating equipments is performed in a form of a STM frame composed of a SOH field and a payload, which is determined by CCITT recommendations. The line terminating equipment provides a FEC circuit which is preferably arranged at a location between MSP and MST function blocks. The FEC circuit is designed to perform coding/decoding operations, using a cyclic Hamming code, directly on each AU-4 message derived from the STM frame. Otherwise, the FEC circuit performs operations on each k-bit interleaved AU-4 message (where `k` is an integer larger than 1). Check bits generated by a FEC coding circuit are written into undefined byte areas in a MSOH field, and error correcting is performed at a decoder circuit on the basis of embedded check bits, therefore FEC operations are performed within a multiplex-section layer. A FEC processing circuit is constituted by shift registers each of which is connected by exclusive-or logic so as to execute FEC processing calculation generating a remainder by a generator polynomial. For a FEC code on direct AU-4 message, the FEC processing circuit in parallel configuration for lowering an operational clock rate is determined by a matrix form calculation, which creates an output vector indicating a set of shift registers' data in a future clock timing from an input vector consisting of data stream in message and initial shift registers' values.

摘要翻译： 在适用于SDH网络的光传输系统中，以由CCITT建议确定的SOH字段和有效载荷构成的STM帧的形式执行两线路终端设备之间的通信。 线路终端设备提供优选地布置在MSP和MST功能块之间的位置的FEC电路。 FEC电路被设计为使用循环汉明码直接在从STM帧导出的每个AU-4消息上执行编码/解码操作。 否则，FEC电路对每个k位交织的AU-4消息（其中'k'是大于1的整数）执行操作。 由FEC编码电路生成的校验位被写入到MSOH字段中的未定义的字节区域中，并且在解码器电路上基于嵌入的校验位执行纠错，因此在多路复用部分层内执行FEC操作。 FEC处理电路由移位寄存器构成，每个移位寄存器通过异或逻辑连接，以执行通过生成多项式生成余数的FEC处理计算。 对于用于直接AU-4消息的FEC码，用于降低操作时钟速率的并行配置的FEC处理电路由矩阵形式计算确定，其形成指示未来时钟定时中的一组移位寄存器数据的输出向量 从由消息中的数据流和初始移位寄存器值组成的输入向量。

公开(公告)号：US20080226298A1

公开(公告)日：2008-09-18

申请号：US10598089

申请日：2004-09-16

申请人： Hiroyuki Fukuyama ,  Toshihiro Itoh ,  Satoshi Tunashima ,  Kimikazu Sano ,  Koichi Murata ,  Yohtaro Umeda ,  Yasuo Tazoh ,  Hirohiko Sugahara ,  Hiromu Toba ,  Masahiro Muraguchi ,  Senichi Suzuki ,  Seiji Fukushima ,  Yoshinori Hibino ,  Tadashi Sakamoto ,  Yoshiaki Yamabayashi ,  Eiji Yoshida ,  Ryuichi Iwamoto

发明人： Hiroyuki Fukuyama ,  Toshihiro Itoh ,  Satoshi Tunashima ,  Kimikazu Sano ,  Koichi Murata ,  Yohtaro Umeda ,  Yasuo Tazoh ,  Hirohiko Sugahara ,  Hiromu Toba ,  Masahiro Muraguchi ,  Senichi Suzuki ,  Seiji Fukushima ,  Yoshinori Hibino ,  Tadashi Sakamoto ,  Yoshiaki Yamabayashi ,  Eiji Yoshida ,  Ryuichi Iwamoto

IPC分类号： H04B10/13

CPC分类号： H04B10/2572

摘要： The present invention has been achieved to provide a novel optical transmission system realizing high-speed optical transmission over greater distance by suppressing waveform degradation caused by mode dispersion and mode transition in a multimode optical transmission line. The optical transmission system of the present invention includes: an optical transmitter for transmitting incoherent light; an excitation mechanism for exciting a predetermined mode in the incoherent light transmitted from the optical transmitter; a multimode optical transmission line for transmitting the incoherent light transmitted from the excitation mechanism; a transmission mechanism for transmitting a predetermined mode in the incoherent light transmitted from the excitation mechanism; and an optical receiver for receiving the incoherent light transmitted from the transmission mechanism or the incoherent light transmitted from the transmission mechanism.

摘要翻译： 本发明是为了提供一种新颖的光传输系统，其通过抑制由多模光传输线路中的模式色散和模式转变引起的波形劣化而实现更大距离的高速光传输。 本发明的光传输系统包括：用于发送非相干光的光发射机; 激励机构，用于激发从所述光发射机发射的非相干光中的预定模式; 用于发送从激励机构发送的非相干光的多模光传输线; 用于在从激励机构发送的非相干光中发送预定模式的传输机构; 以及用于接收从传输机构传输的非相干光或从传输机构发射的非相干光的光接收机。

公开(公告)号：US5631896A

公开(公告)日：1997-05-20

申请号：US503087

申请日：1995-07-17

申请人： Nobuyuki Kawase ,  Yoshiaki Yamabayashi ,  Yoshihiko Uematsu

发明人： Nobuyuki Kawase ,  Yoshiaki Yamabayashi ,  Yoshihiko Uematsu

IPC分类号： H04B1/74 ,  H04J3/06 ,  H04J3/14 ,  H04L1/22 ,  H04L12/70 ,  H04Q11/04

CPC分类号： H04B1/74 ,  H04J3/062 ,  H04J3/14 ,  H04L1/22 ,  H04Q11/0478 ,  H04J2203/0051 ,  H04J2203/006 ,  H04J2203/0076 ,  H04L2012/5619 ,  H04L2012/5627 ,  H04L2012/5647

摘要： A hitless path switching method without a bit loss. The same digital line signals on a working path and a protection path are continuously monitored independently for bit errors. If a bit error occurs in the working path and no bit error occurs in the protection path, a switching trigger is produced and a switching operation from the working path to the protection path is performed on a data block basis. Only correct data are transferred to downstream apparatuses. Reliable hitless switching is achieved not only in response to a failure in a path, but also in response to a bit error. Using data blocks of one frame length with an indicator for bit error checking placed at its beginning or top makes effective switching possible.

摘要翻译： 无差错路径切换方式，无差错。 在工作路径和保护路径上相同的数字线路信号被独立地连续地监视位错误。 如果在工作路径中发生位错误，并且在保护路径中不发生位错误，则产生切换触发，并且基于数据块执行从工作路径到保护路径的切换操作。 只有正确的数据被传送到下游设备。 不仅可以响应于路径中的故障而且响应于位错误来实现可靠的无中断切换。 使用一帧长度的数据块和位于其开头或顶部的位错误检查指示器可以进行有效的切换。