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    METHOD AND APPARATUS FOR DOWNSTREAM TRANSMISSION
    8.
    发明公开
    METHOD AND APPARATUS FOR DOWNSTREAM TRANSMISSION 审中-公开

    公开(公告)号：EP4195536A1

    公开(公告)日：2023-06-14

    申请号：EP21213206.2

    申请日：2021-12-08

    申请人： Nokia Solutions and Networks Oy

    发明人： LEFEVRE, Yannick

    IPC分类号： H04B10/272 ,  H04B10/516 ,  H04Q11/00 ,  H04L1/00

    摘要： The present invention discloses an apparatus for use by an OLT, communicatively connected to ONUs, comprising means for performing: interleaving a first number N of codewords according to a predetermined interleaving scheme, obtaining an interleaved bit stream, wherein, N is an even number; mapping the interleaved bit stream into a sequence of 4-level pulse amplitude modulation, PAM4, labels according to a predetermined mapping scheme, with a respective PAM4 label comprising a least significant bit, LSB, and a most significant bit, MSB, respectively corresponding to a bit in the interleaved bit stream; transmitting a sequence of PAM4 symbols generated based on the sequence of PAM4 labels to the ONUs; wherein, bits from respective one of the N codewords are assigned to LSBs of a first subset of labels, and to MSBs of a second subset of labels, with the first and the second subset of labels being determined based on the predetermined interleaving scheme and the predetermined mapping scheme and respectively comprising labels located N labels apart in the sequence of PAM4 labels.

    OPTICAL TRANSMITTER AND OPTICAL MODULATION METHOD
    10.
    发明公开
    OPTICAL TRANSMITTER AND OPTICAL MODULATION METHOD 审中-公开

    公开(公告)号：EP4164144A1

    公开(公告)日：2023-04-12

    申请号：EP21833289.8

    申请日：2021-06-24

    申请人： Huawei Technologies Co., Ltd.

    发明人： MI, Guangcan ,  CHANG, Zeshan ,  CHANG, Tianhai

    IPC分类号： H04B10/50 ,  H04B10/516 ,  H04B10/572

    摘要： This application provides an optical transmitter, including a wavelength selector and a plurality of modulator groups. Each modulator group includes a plurality of modulators, and operating wavelengths of any two modulators in a same modulator group are different. The wavelength selector is configured to: obtain a first beam from a multi-wavelength light source, and generate a second beam based on the first beam, where the second beam includes some of the plurality of wavelengths. A first modulator in a first modulator group is configured to modulate first to-be-sent data onto a first wavelength in the second beam. The optical transmitter in this application may be applied to a wavelength-sensitive optical switching system, and the first wavelength is a wavelength corresponding to a receiving end of the first to-be-sent data, so that a forwarding delay of an optical signal can be reduced. In addition, a wavelength-tunable laser does not need to be used to meet a requirement of the wavelength-sensitive optical switching system, so that costs of the optical transmitter are reduced, a wavelength adjustment time is reduced, and a sending delay of the optical signal is reduced.