公开(公告)号：US20230403077A1

公开(公告)日：2023-12-14

申请号：US18449512

申请日：2023-08-14

Applicant: HUAWEI TECHNOLOGIES CO., LTD.

Inventor： Stefano Calabro ,  Changsong Xie ,  Jinlong Wei

IPC: H04B10/2513 ,  H04B10/25

CPC classification number: H04B10/2513 ,  H04B10/2589

Abstract: A method for optical communication between transceivers through an optical link for chromatic dispersion pre-compensation, includes generating and sending, by a second transceiver, a first CD pre-compensated optical signal and a second CD pre-compensated optical signal, to the first transceiver through the optical link. The method further includes receiving, by a first transceiver, the first and second CD pre-compensated optical signals, and calculating a first residual chromatic dispersion (RCD) value from the received first CD pre-compensated optical signal, and a second RCD value from the received second CD pre-compensated optical signal. The method further includes calculating, by the first transceiver, a third PCD filter using the first RCD value, and a fourth PCD filter using the second RCD value. The third PCD filter and the fourth PCD filters are used to generate and send two CD pre-compensated optical signals to the second transceiver, which provides tunable CD pre-compensation capability.

公开(公告)号：US20210367828A1

公开(公告)日：2021-11-25

申请号：US17398418

申请日：2021-08-10

Applicant: Huawei Technologies Co., Ltd.

Inventor： Stefano Calabro ,  Maximilian Schaedler ,  Fabio Pittala ,  Maxim Kuschnerov

IPC: H04L27/34

Abstract: A transmitting device configured to obtain a message to be transmitted; map the obtained message onto a two-dimensional 2n-symbol constellation to obtain a sequence of discrete constellation symbols, where n is an odd number not less than 3. A receiving device configured to receive a sequence of noisy discrete constellation symbols; demap the sequence of noisy discrete constellation symbols to output data using a two-dimensional 2n-symbol constellation, where n is an odd number not less than 3.

公开(公告)号：US20230129067A1

公开(公告)日：2023-04-27

申请号：US18146176

申请日：2022-12-23

Applicant: Huawei Technologies Co., Ltd.

Inventor： Stefano Calabro ,  Changsong Xie

IPC: H04B10/2525

Abstract: The present disclosure relates to a digital filter arrangement (DFA) for compensating group velocity dispersion (GVD) in an optical transmission system (OTS) wherein the DFA is configured to receive a sequence of samples of a digital input signal in the time domain in the form of consecutive blocks of size L. The DFA is configured to generate M discrete Fourier transforms of a current overlap block of a size N greater than the size L and of M−1 delayed versions of the current overlap block. The DFA is configured to filter the entries of the generated M discrete Fourier transforms to generate an output discrete Fourier transform with N entries, wherein the compensation filter is implemented by a delay network and a linear combination algorithm.

公开(公告)号：US11658860B2

公开(公告)日：2023-05-23

申请号：US17398418

申请日：2021-08-10

Applicant: Huawei Technologies Co., Ltd.

Inventor： Stefano Calabro ,  Maximilian Schaedler ,  Fabio Pittala ,  Maxim Kuschnerov

IPC: H04L27/34

CPC classification number: H04L27/3411

Abstract: A transmitting device configured to obtain a message to be transmitted; map the obtained message onto a two-dimensional 2n-symbol constellation to obtain a sequence of discrete constellation symbols, where n is an odd number not less than 3. A receiving device configured to receive a sequence of noisy discrete constellation symbols; demap the sequence of noisy discrete constellation symbols to output data using a two-dimensional 2n-symbol constellation, where n is an odd number not less than 3.