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    Optical and electronic integrated switch and optical network system
    2.
    发明授权
    Optical and electronic integrated switch and optical network system 有权

    公开(公告)号：US11881897B2

    公开(公告)日：2024-01-23

    申请号：US17801130

    申请日：2020-02-26

    申请人： Nippon Telegraph and Telephone Corporation

    发明人： Hideki Nishizawa ,  Seiki Kuwabara ,  Seiji Okamoto ,  Shuto Yamamoto ,  Tetsuro Inui ,  Shunichi Soma ,  Kenya Suzuki ,  Osamu Moriwaki ,  Keita Yamaguchi

    IPC分类号： H04B10/61 ,  H04B10/2575 ,  H04L45/00

    CPC分类号： H04B10/61 ,  H04B10/25759 ,  H04L45/56

    摘要： A photo-electron fusion switch that can perform optical communications without any trouble, even when nodes of a communication source and a communication partner that are large in transmission capacity are connected, and makes it possible to realize a concentrated arrangement of devices having similar functions and reduce the communication processing time is connected to communication source's information processing devices and communication partner's information processing devices and information processing devices that are each different in transmission speed so as to configure an optical network system. The photo-electron fusion switch includes a network processor of an electronic circuit for controlling packet switch functions, a plurality of optical transmitter/receivers that can support coherent communications and has a photoelectric conversion function capable of transmitting and receiving optical signals different in transmission speed, an optical line switching device, and a plurality of multiplexing/separators. Each multiplexing/separator simultaneously transmits and receives respective optical signals different in transmission speed to and from the nodes via optical waveguides.

    Optical transmission system
    4.
    发明授权
    Optical transmission system 有权

    公开(公告)号：US11581944B2

    公开(公告)日：2023-02-14

    申请号：US17291170

    申请日：2019-11-07

    申请人： NIPPON TELEGRAPH AND TELEPHONE CORPORATION

    发明人： Shuto Yamamoto ,  Seiji Okamoto ,  Akira Masuda ,  Hiroki Taniguchi ,  Yoshiaki Kisaka

    IPC分类号： H04B10/2507 ,  H03M13/41 ,  H04B10/516 ,  H04B10/61 ,  H04L25/49

    摘要： An optical transmission system including an optical transmitter and an optical receiver, wherein the optical transmitter includes a signal coding unit that performs non-linear block coding on an M (M is an integer greater than or equal to 1)-value symbol sequence or a bit sequence input as data information to generate an L (L is an integer greater than or equal to 2, L>M)-value symbol sequence that corresponds to the M-value symbol sequence or the bit sequence in one-to-one correspondence, a digital-to-analog conversion unit that converts the generated L-value symbol sequence to an analog signal, and a modulator that generates an optical modulation signal by performing modulation based on the analog signal, and the optical receiver includes a light receiving unit that receives the optical modulation signal transmitted from the optical transmitter and converts the optical modulation signal to an electrical signal, and a signal decoding unit that restores the M-value symbol sequence or the bit sequence by performing processing that is the reverse of processing performed by the signal coding unit, on the electrical signal.

    Digital coherent receiver and digital coherent receiving method
    5.
    发明授权
    Digital coherent receiver and digital coherent receiving method 有权

    公开(公告)号：US11283528B2

    公开(公告)日：2022-03-22

    申请号：US17272790

    申请日：2019-08-27

    申请人： NIPPON TELEGRAPH AND TELEPHONE CORPORATION

    发明人： Akira Masuda ,  Seiji Okamoto ,  Shuto Yamamoto ,  Fukutaro Hamaoka ,  Masanori Nakamura ,  Asuka Matsushita ,  Yoshiaki Kisaka

    IPC分类号： H04B10/61 ,  H04B10/079 ,  H04J14/06

    摘要： A digital coherent receiver includes: an adaptive equalizer configured to execute, using a first tap coefficient, adaptive equalization processing on a digital signal that corresponds to a signal; a first coefficient updating unit configured to update the first tap coefficient based on the digital signal on which the adaptive equalization processing has not been executed, the digital signal on which the adaptive equalization processing has been executed, and a first step size; a second coefficient updating unit configured to update a second tap coefficient based on the digital signal on which the adaptive equalization processing has not been executed, the digital signal on which the adaptive equalization processing has been executed, and a second step size; and a control unit configured to detect a fluctuation speed of a state of polarization of the digital signal based on the second tap coefficient, and change the first tap coefficient to the updated second tap coefficient if it is determined that the fluctuation speed is higher than or equal to a speed threshold.

    Optical and electronic integrated switch
    9.
    发明授权
    Optical and electronic integrated switch 有权

    公开(公告)号：US11979694B2

    公开(公告)日：2024-05-07

    申请号：US17795603

    申请日：2020-01-30

    申请人： Nippon Telegraph and Telephone Corporation

    发明人： Osamu Moriwaki ,  Shunichi Soma ,  Keita Yamaguchi ,  Kenya Suzuki ,  Seiki Kuwabara ,  Tetsuro Inui ,  Shuto Yamamoto ,  Seiji Okamoto ,  Hideki Nishizawa

    IPC分类号： H04Q11/00

    CPC分类号： H04Q11/0071

    摘要： An optical and electronic integrated switch includes a network processor that controls the functions of the packet switch, a plurality of optical transceivers having photoelectric conversion functions, and a plurality of optical switches. The optical switches include different types of optical core switch and a plurality of optical-path selection switches. The optical transceivers provided near the processor have a regenerative relay function that regenerates optical signals and turns back the optical signals, and perform optical communication with a communication counterpart via the optical switches. In the optical communication, optical switches of the different types can cooperate to set paths for optical cut-through in which path selection is performed such that inputted optical signals are outputted without the intervention of the processor. This optical cut-through can be effectively performed without imposing a signal processing burden that consumes electric power on the processor.