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    ERROR CORRECTION DEVICE, ERROR CORRECTION METHOD, AND OPTICAL COMMUNICATION SYSTEM
    1.
    发明申请
    ERROR CORRECTION DEVICE, ERROR CORRECTION METHOD, AND OPTICAL COMMUNICATION SYSTEM 有权

    公开(公告)号：US20210075541A1

    公开(公告)日：2021-03-11

    申请号：US16955676

    申请日：2018-12-20

    Applicant: NTT ELECTRONICS CORPORATION ,  NIPPON TELEGRAPH AND TELEPHONE CORPORATION

    Inventor： Fumiaki NAKAGAWA ,  Yasuharu ONUMA ,  Katsuichi OYAMA ,  Yasuyuki ENDOH ,  Etsushi YAMAZAKI ,  Yoshiaki KISAKA ,  Masahito TOMIZAWA

    IPC: H04L1/00 ,  H04B10/80

    Abstract: An error correction device according to this invention includes a first correction unit configured to perform error correction decoding of data by a repetitive operation, and having a full operation state in which the repetitive operation of the error correction decoding is repeated until convergence is obtained and a save operation state in which the number of times of the repetitive operation of the error correction decoding is restricted to a predetermined number of times, an error information estimation unit configured to estimate an input error rate or an output error rate of the first correction unit using a decoding result of the first correction unit, and a control unit configured to control transition between the full operation state and the save operation state of the first correction unit based on at least one piece of information of the input error rate, the output error rate, and an operation time of the first correction unit. According to this invention, it is possible to provide an error correction device that can improve a transmission characteristic while suppressing power consumption.

    COHERENT COMMUNICATION SYSTEM, COMMUNICATION METHOD, AND TRANSMISSION METHOD
    3.
    发明申请
    COHERENT COMMUNICATION SYSTEM, COMMUNICATION METHOD, AND TRANSMISSION METHOD 有权
    相干通信系统，通信方法和传输方法

    公开(公告)号：US20150341138A1

    公开(公告)日：2015-11-26

    申请号：US14759329

    申请日：2014-01-15

    Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATION

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

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

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

    Abstract: 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.

    Abstract translation: 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。

    OPTICAL RECEIVING DEVICE AND PHASE CYCLE REDUCTION METHOD
    4.
    发明申请
    OPTICAL RECEIVING DEVICE AND PHASE CYCLE REDUCTION METHOD 有权
    光接收装置和相循环减少方法

    公开(公告)号：US20150333838A1

    公开(公告)日：2015-11-19

    申请号：US14758941

    申请日：2014-01-24

    Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATION

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

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

    CPC classification number: H04B10/6165 ,  H04L7/0041 ,  H04L7/0075 ,  H04L27/066 ,  H04L27/389

    Abstract: 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.

    Abstract translation: 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。

    TRANSMISSION APPARATUS AND TRANSMISSION SYSTEM
    5.
    发明申请
    TRANSMISSION APPARATUS AND TRANSMISSION SYSTEM 有权

    公开(公告)号：US20220109449A1

    公开(公告)日：2022-04-07

    申请号：US17311646

    申请日：2019-12-04

    Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATION

    Inventor： Fumikazu INUZUKA ,  Kei KITAMURA ,  Akira HIRANO ,  Masahito TOMIZAWA ,  Takuya OHARA

    IPC: H03L7/18 ,  H04J3/06 ,  H04J3/14 ,  H04L7/00 ,  H04B1/06 ,  H04B1/04

    Abstract: A first reception processing unit performs a process of receiving a first signal transmitted on a first transmission line, a second reception processing unit performs a process of receiving a second signal transmitted on a second transmission line, and an output speed control unit controls output speeds of the first signal and the second signal subjected to the reception process. A system switching unit selects and outputs the first signal or the second signal subjected to a reception process, and an output processing unit performs a process for output to another apparatus on the output from the system switching unit. A reception side clock output unit outputs a clock signal giving a processing timing of each process, and a clock frequency control unit adjusts a frequency of the clock signal giving the processing timing to the output processing unit. A frequency adjustment range calculation unit calculates an adjustment range of the frequency based on frequency deviation accuracy of the reception side clock output unit, frequency deviation accuracy of a transmission side clock output unit that outputs a clock signal giving a processing timing to a transmission process at a transmission apparatus on the transmission side, and a prescribed value of a frequency deviation.

    SIGNAL PROCESSING APPARATUS AND SIGNAL PROCESSING METHOD
    9.
    发明申请
    SIGNAL PROCESSING APPARATUS AND SIGNAL PROCESSING METHOD 有权

    公开(公告)号：US20210203363A1

    公开(公告)日：2021-07-01

    申请号：US17056719

    申请日：2019-05-09

    Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATION

    Inventor： Seiji OKAMOTO ,  Etsushi YAMAZAKI ,  Masanori NAKAMURA ,  Yoshiaki KISAKA ,  Masahito TOMIZAWA

    IPC: H03M13/35 ,  H04L1/00 ,  H04L1/20

    Abstract: A signal processing device includes a distributing unit and a plurality of correcting units with different processing performance, the distributing unit distributes a bit sequence having a first number of bits to the first correcting unit, and a bit sequence having a second number of bits less than the first number of bits to the second correcting unit having lower processing performance than the first correcting unit, the first correcting unit applies error correction processing to the bit sequence having the first number of bits distributed to the first correcting unit, and the second correcting unit applies error correction processing to the bit sequence having the second number of bits distributed to the second correcting unit.

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