公开(公告)号：US20150372766A1

公开(公告)日：2015-12-24

申请号：US14766635

申请日：2014-02-13

申请人： NIPPON TELEGRAPH AND TELEPHONE CORPORATION

发明人： Mitsuteru YOSHIDA ,  Etsushi YAMAZAKI ,  Seiji OKAMOTO ,  Hiroyuki UZAWA ,  Kengo HORIKOSHI ,  Koichi ISHIHARA ,  Takayuki KOBAYASHI ,  Yoshiaki KISAKA ,  Masahito TOMIZAWA ,  Naoki FUJIWARA ,  Tomoyoshi KATAOKA ,  Kazushige YONENAGA

IPC分类号： H04B10/61 ,  H04B10/2507 ,  H04J14/06 ,  H04B10/516

CPC分类号： H04B10/6165 ,  H04B10/2507 ,  H04B10/516 ,  H04B10/61 ,  H04J14/06 ,  H04L27/38 ,  H04L2027/0067 ,  H04L2027/0095

摘要： An increase in circuit scale is suppressed and a phase variation caused in a transmission path or the like is compensated for. An optical transmission system includes: a pilot symbol detection unit which detects a plurality of pilot symbols intermittently inserted into a received complex electric field signal that is obtained through coherent detection for a received optical signal; an error signal computation unit which calculates a complex electric field error signal indicating a phase variation at each pilot symbol based on the pilot symbols detected by the pilot symbol detection unit and a predetermined reference symbol; a compensation electric field signal generation unit which estimates a phase variation between the pilot symbols in the received complex electric field signal using filter processing based on the complex electric field error signal calculated by the error signal computation unit; and a phase noise compensation unit which performs phase compensation for the received complex electric field signal based on the phase variation between the pilot symbols estimated by the compensation electric field signal generation unit.

摘要翻译： 抑制电路规模的增加，并且补偿在传输路径等中引起的相位变化。 光传输系统包括：导频符号检测单元，其检测间歇地插入到通过接收的光信号的相干检测获得的接收复电场信号中的多个导频符号; 误差信号计算单元，基于由导频符号检测单元检测的导频符号和预定的参考符号，计算指示每个导频符号的相位变化的复电场误差信号; 补偿电场信号生成单元，其基于由所述误差信号计算单元计算的复电场误差信号，使用滤波处理来估计所述接收复电场信号中的导频符号之间的相位变化; 以及相位噪声补偿单元，其基于由补偿电场信号生成单元估计的导频符号之间的相位变化，对接收到的复数电场信号进行相位补偿。

公开(公告)号：US20170117961A1

公开(公告)日：2017-04-27

申请号：US15302145

申请日：2015-04-10

申请人： NIPPON TELEGRAPH AND TELEPHONE CORPORATION ,  NTT Electronics Corporation

发明人： Mikio YONEYAMA ,  Hiroto KAWAKAMI ,  Takashi ONO ,  Akihiko MATSUURA ,  Tomoyoshi KATAOKA ,  Katsuya TANAKA ,  Masahiro TACHIBANA ,  Yuya OYAMA

IPC分类号： H04B10/079 ,  H04L27/36 ,  H04B10/516

CPC分类号： H04B10/07955 ,  G02F1/01 ,  G02F2001/212 ,  G02F2201/58 ,  H04B10/00 ,  H04B10/5053 ,  H04B10/50575 ,  H04B10/5161 ,  H04B10/541 ,  H04B10/564 ,  H04J14/08 ,  H04L27/364

摘要： A light modulation device detects a power of the modulated optical signal modulated by each of an I-component optical modulator and a Q-component optical modulator, synchronously-detects a component of a frequency fd from the power of the modulated optical signal, outputs a dither signal of a frequency fd/n (where n is a positive integer equal to or larger than 1) applied to a first bias voltage or a second bias voltage when adjusting the first bias voltage or the second bias voltage, outputs two dither signals having a frequency fd/m (where m is a positive integer equal to or larger than 1, where n

公开(公告)号：US20150341138A1

公开(公告)日：2015-11-26

申请号：US14759329

申请日：2014-01-15

申请人： NIPPON TELEGRAPH AND TELEPHONE CORPORATION

发明人： Koichi ISHIHARA ,  Masato MIZOGUCHI ,  Tomoki MURAKAMI ,  Tomoyoshi KATAOKA ,  Yoshiaki KISAKA ,  Tadao NAKAGAWA ,  Etsushi YAMAZAKI ,  Seiji OKAMOTO ,  Kengo HORIKOSHI ,  Masahito TOMIZAWA ,  Riichi KUDO

IPC分类号： H04J14/08 ,  H04J3/14 ,  H04B10/61 ,  H04B10/077

CPC分类号： H04J14/08 ,  H04B10/0775 ,  H04B10/2513 ,  H04B10/25133 ,  H04B10/516 ,  H04B10/61 ,  H04B10/6161 ,  H04B10/697 ,  H04B2210/072 ,  H04J3/14

摘要： The estimation of an amount of chromatic dispersion using a training signal sequence is possible. A transmission method includes: a training signal sequence generation step of generating, as training signal sequences, a plurality of signal sequences having power concentrated in a plurality of frequency bands, the power concentrated at different frequency bands; a training signal sequence selection step of selecting at least one training signal sequence from among the plurality of training signal sequences generated in the training signal sequence generation step, a signal multiplexing step of generating a signal sequence obtained by time-division multiplexing the training signal sequence selected in the training signal sequence selection step with a transmission data sequence, and an electrical-to-optical conversion step of transmitting the signal sequence generated in the signal multiplexing step as an optical signal.

摘要翻译： 使用训练信号序列的色散量的估计是可能的。 发送方法包括：训练信号序列生成步骤，将集中在多个频带的功率的多个信号序列作为训练信号序列生成，集中在不同频带的功率; 训练信号序列选择步骤，从在所述训练信号序列生成步骤中生成的所述多个训练信号序列中选择至少一个训练信号序列，生成通过对所述训练信号序列进行时分复用而获得的信号序列的信号复用步骤 在发送数据序列的训练信号序列选择步骤中选择的电 - 光转换步骤，将在信号复用步骤中生成的信号序列作为光信号进行发送。

公开(公告)号：US20150333838A1

公开(公告)日：2015-11-19

申请号：US14758941

申请日：2014-01-24

申请人： NIPPON TELEGRAPH AND TELEPHONE CORPORATION

发明人： Kengo HORIKOSHI ,  Kohki SHIBAHARA ,  Etsushi YAMAZAKI ,  Mitsuteru YOSHIDA ,  Koichi ISHIHARA ,  Takayuki KOBAYASHI ,  Yoshiaki KISAKA ,  Takuya OHARA ,  Masahito TOMIZAWA ,  Tomoyoshi KATAOKA

IPC分类号： H04B10/61 ,  H04L27/38 ,  H04L7/00 ,  H04L27/06

CPC分类号： H04B10/6165 ,  H04L7/0041 ,  H04L7/0075 ,  H04L27/066 ,  H04L27/389

摘要： An optical receiving device receives an optical signal that has been modulated by means of phase modulation or quadrature amplitude modulation, converts the received optical signal into an electrical signal using coherent detection, and performs phase compensation on the converted received signal, and includes: a carrier phase estimation unit that estimates carrier phase errors in a received symbol string obtained from the received signal; a gain adjustment unit that performs gain adjustment on symbols input into the carrier phase adjustment unit; a phase cycle slip reduction unit that, by performing statistical processing on an output from the carrier phase estimation unit, detects general noise that causes a phase cycle slip, and reduces the phase cycle slip; and a phase compensation circuit that compensates carrier phase errors contained in the received signal using an output from the carrier phase estimation unit.

摘要翻译： 光接收装置接收通过相位调制或正交幅度调制进行了调制的光信号，使用相干检测将接收的光信号转换为电信号，并对转换的接收信号进行相位补偿，并包括：载波 估计从接收信号获得的接收符号串中的载波相位误差的相位估计单元; 增益调整单元，对输入到所述载波相位调整单元的符号进行增益调整; 通过对来自载波相位估计单元的输出进行统计处理，检测导致相位滑动的一般噪声并减少相位滑动的相位滑移减小单元; 以及相位补偿电路，其使用来自载波相位估计单元的输出来补偿接收信号中包含的载波相位误差。

公开(公告)号：US20170111116A1

公开(公告)日：2017-04-20

申请号：US15126557

申请日：2014-11-19

申请人： NIPPON TELEGRAPH AND TELEPHONE CORPORATION

发明人： Takuya OHARA ,  Kei KITAMURA ,  Yoshiaki KISAKA ,  Shigeki AISAWA ,  Masahiro SUZUKI ,  Etsushi YAMAZAKI ,  Tomoyoshi KATAOKA ,  Masahito TOMIZAWA ,  Yoshiaki YAMADA ,  Mitsuhiro TESHIMA ,  Akira HIRANO

IPC分类号： H04B10/40 ,  H04B10/60 ,  H04B10/27 ,  H04B10/516

CPC分类号： H04B10/40 ,  H04B10/27 ,  H04B10/5161 ,  H04B10/60 ,  H04J3/00 ,  H04J3/1652 ,  H04J14/00

摘要： A transport apparatus includes: a client signal transceiving unit which transceives a client signal; a line signal transceiving unit which performs electric-optic conversion on a line signal to be transmitted, transmits an optical line signal, performs optic-electric conversion on a received line signal, and outputs an electrical line signal; and a plurality of signal processing units which perform signal processing on the client signal to generate the line signal to be transmitted and perform signal processing on the electrical line signal to generate the client signal. Each of the plurality of signal processing units includes a signal transceiving unit which performs transfer of a branched signal obtained by branching a signal to be transmitted and a merged signal obtained by merging received signals with another signal processing unit, and the signal transceiving unit of each of the plurality of signal processing units and the signal transceiving unit of the other signal processing unit are coupled via an inter-chip wiring.

公开(公告)号：US20170070296A1

公开(公告)日：2017-03-09

申请号：US15122582

申请日：2015-03-17

申请人： NIPPON TELEGRAPH AND TELEPHONE CORPORATION

发明人： Seiji OKAMOTO ,  Koichi ISHIHARA ,  Etsushi YAMAZAKI ,  Mitsuteru YOSHIDA ,  Tomoyoshi KATAOKA ,  Kazushige YONENAGA ,  Yoshiaki KISAKA ,  Masanori NAKAMURA ,  Masahito TOMIZAWA

IPC分类号： H04B10/516 ,  H04B10/508

CPC分类号： H04B10/516 ,  H04B10/0775 ,  H04B10/2513 ,  H04B10/2557 ,  H04B10/508 ,  H04L27/3455 ,  H04L27/3483 ,  H04L27/366

摘要： An optical signal transmission apparatus includes a modulation unit which modulates a transmission signal, a training signal sequence generation unit which generates a plurality of signal sequences having power concentrated in a plurality of different frequency bands, at least one of an amplitude and a phase of the plurality of signal sequences being modulated, as a training signal sequence, a signal multiplexing unit which appends the training signal sequence to the transmission signal, and an electro-optical conversion unit which converts a signal sequence obtained by appending the training signal sequence to the transmission signal into an optical signal and transmits the optical signal.

摘要翻译： 光信号传输装置包括：调制单元，其对发送信号进行调制;训练信号序列生成单元，生成具有集中在多个不同频带的功率的多个信号序列，所述训练信号序列生成单元的振幅和相位中的至少一个 多个信号序列作为训练信号序列被调制为将训练信号序列附加到传输信号的信号复用单元，以及电光转换单元，其将通过将训练信号序列附加到传输获得的信号序列 信号转换为光信号并发送光信号。