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    SIGNAL PROCESSING DEVICE, SIGNAL PROCESSING METHOD, AND PROGRAM
    153.
    发明公开
    SIGNAL PROCESSING DEVICE, SIGNAL PROCESSING METHOD, AND PROGRAM 审中-公开

    公开(公告)号：EP3996297A1

    公开(公告)日：2022-05-11

    申请号：EP19946112.0

    申请日：2019-09-17

    申请人： NIPPON TELEGRAPH AND TELEPHONE CORPORATION

    发明人： HORIKOSHI Kengo ,  NAKAMURA Masanori ,  OKAMOTO Seiji ,  NISHIZAWA Hideki ,  YAMAZAKI Etsushi

    IPC分类号： H04B10/2569 ,  H04B10/61

    摘要： A signal processing apparatus includes: a coefficient update unit configured to approximate a characteristic of a transmission line of an optical signal by a first tap coefficient vector of which an L0 norm is a predetermined value or less; a zeroing unit configured to generate a second tap coefficient vector by replacing, with 0, a tap coefficient of which an absolute value is less than a threshold among tap coefficients of the first tap coefficient vector; and an adaptive filter configured to perform, based on the second tap coefficient vector, adaptive equalization processing on a digital signal corresponding to an optical signal received via the transmission line ( Figure 2 ).

    POWER EFFICIENT AND SCALABLE CO-PACKAGED OPTICAL DEVICES
    154.
    发明公开
    POWER EFFICIENT AND SCALABLE CO-PACKAGED OPTICAL DEVICES 审中-公开

    公开(公告)号：EP3979524A1

    公开(公告)日：2022-04-06

    申请号：EP20216469.5

    申请日：2020-12-22

    申请人： Juniper Networks, Inc.

    发明人： DI MOLA, Domenico ,  ALLESTON, Steven B. ,  QU, Zhen ,  HOLMES, Ryan

    IPC分类号： H04B10/40 ,  H04B10/50 ,  H04B10/61 ,  H04B10/80

    摘要： A co-packaged optical-electrical chip can include an application-specific integrated circuit (ASIC) and a plurality of optical modules, such as optical transceivers. The ASIC and each of the optical modules can exchange electrical signaling via integrated electrical paths. The ASIC can include Ethernet switch, error correction, bit-to-symbol mapping/demapping, and digital signal processing circuits to pre-compensate and post-compensate channel impairments (e.g., inter-channel/intra-channel impairments) in electrical and optical domains. The co-packaged inter-chip interface can be scaled to handle different data rates using spectral efficient signaling formats (e.g., QAM-64, PAM-8) without adding additional data lines to a given design and without significantly increasing the power consumption of the design.

    TRAINING-AIDED FEEDFORWARD CHANNEL EQUALIZATION
    158.
    发明公开
    TRAINING-AIDED FEEDFORWARD CHANNEL EQUALIZATION 审中-公开

    公开(公告)号：EP3926860A1

    公开(公告)日：2021-12-22

    申请号：EP21172055.2

    申请日：2021-05-04

    申请人： Ciena Corporation

    发明人： BABAEE, Ramin ,  OVEIS GHARAN, Shahab ,  BOUCHARD, Martin ,  ROBERTS, Kim B.

    IPC分类号： H04B10/61

    摘要： An optical signal (204) modulated with a stream of symbols comprising a sequence of training symbols is received at a receiver (104,200). First equalizer circuitry (242,300) calculates (702) and applies first coefficients (304) to digital signals (240) representative of the optical signal, resulting in first compensated signals (244). Second equalizer circuitry (246,500) calculates (704) second coefficients (552) based on a correlation between the first compensated signals and digital signals representative of the sequence of training symbols (506) and applies the second coefficients to the first compensated signals, resulting in second compensated signals (248). Third equalizer circuitry (250,400) calculates (706) and applies third coefficients (404) to the second compensated signals, resulting in third compensated signals (252). The first, second, and third coefficients compensate for impairments varying at respective first, second, and third rates, where the third rate is higher than the first rate and lower than the second rate.

    OPTICAL TRANSFER SYSTEM, OPTICAL TRANSMITTER, AND OPTICAL COMMUNICATION METHOD
    160.
    发明公开
    OPTICAL TRANSFER SYSTEM, OPTICAL TRANSMITTER, AND OPTICAL COMMUNICATION METHOD 审中-公开

    公开(公告)号：EP3917033A1

    公开(公告)日：2021-12-01

    申请号：EP20776767.4

    申请日：2020-03-18

    申请人： NEC Corporation

    发明人： HARA Yasushi

    IPC分类号： H04B10/079 ,  H04B10/516 ,  H04B10/61

    摘要： In order to stabilize the characteristics of reception of an optical signal received via a transfer path, this optical receiver is provided with: a local beam output means 1; a light receiving means 2; a photoelectric conversion means 3; a measuring means 4; a control means 5; and a comparing means 6. The local beam output means 1 outputs a local beam with varying wavelengths. The light receiving means 2 receives an optical signal, inputted via the transfer path, by causing the optical signal to be interfered with the local beam, and outputs the optical signal as a received optical signal. The photoelectric conversion means 3 converts the received optical signal into an electric signal. The measuring means 4 measures the electric signal obtained by conversion by the photoelectric conversion means 3. The control means 5 controls the wavelength of the local beam. The comparing means 6, when the control means 5 sweeps the wavelength of the local beam in a predetermined wavelength range with respect to the central wavelength of the optical signal, generates difference data between a spectrum based on a result of the measuring, by the measuring means 4, of the electric signal in accordance with a change in the wavelength of the local beam and a preset reference spectrum.