公开(公告)号：US20180091288A1

公开(公告)日：2018-03-29

申请号：US15353394

申请日：2016-11-16

Applicant: Huawei Technologies Co., Ltd.

Inventor： Mahdi Zamani ,  Mehdi Torbatian ,  Jeebak Mitra ,  Zhuhong Zhang ,  Chuandong Li

IPC: H04L7/00 ,  H04B10/60

CPC classification number: H04L7/0075 ,  H04B10/60

Abstract: An optical channel between a coherent optical transmitter and a coherent optical receiver may include one or more components that act as a bandpass filter with a passband that is narrower than the signal bandwidth. Such a narrow filter may significantly attenuate the signal content close to the band edge of the data signal. As a result, timing error detection may work less effectively, and therefore clock recovery may be less effective or fail. Methods and systems are disclosed in which a single optical carrier is used to transmit a data signal that has multiple bands, and timing error detection is performed at the receiver using one or more inner bands of the multiple bands. The timing error detection may therefore be made more robust to the effects of the narrow filtering.

公开(公告)号：US10680718B2

公开(公告)日：2020-06-09

申请号：US16293324

申请日：2019-03-05

Applicant: Huawei Technologies Co., Ltd.

Inventor： Mahdi Zamani ,  Jeebak Mitra ,  Hossein Najafi ,  Zhuhong Zhang ,  Chuandong Li

IPC: H04B10/548 ,  H04B10/61 ,  H04B10/556

Abstract: Aspects of the present disclosure are directed in part to a receiver DSP unit including an equalization module. The equalization module includes a trellis-based equalization module that may utilize multiple trellis-based processors (TBP), which can each be individually adaptively configured for performing a trellis-based equalization. The design of the TBPs allows them to be configured for compensating a residual Inter-Symbol Interference (ISI) as well as compensating a residual Phase Noise (PN). ISI is an example of an additive impairment and PN is an example of a multiplicative impairment that communication systems, particularly high speed transmission systems such as coherent optical systems, can suffer from.

公开(公告)号：US09350450B2

公开(公告)日：2016-05-24

申请号：US14252099

申请日：2014-04-14

Applicant: Huawei Technologies Co., Ltd.

Inventor： Chen Chen ,  Mahdi Zamani ,  Zhuhong Zhang ,  Chuandong Li

IPC: H04Q7/20 ,  H04B7/00 ,  H04B10/2507 ,  H04B10/40 ,  H04B10/50 ,  H04B10/516 ,  H04B10/69 ,  H04B10/2575 ,  H04B10/54 ,  H04B10/556

CPC classification number: H04B10/2507 ,  H04B10/2575 ,  H04B10/40 ,  H04B10/506 ,  H04B10/516 ,  H04B10/541 ,  H04B10/548 ,  H04B10/556 ,  H04B10/697 ,  H04L5/0046

Abstract: System and method embodiments are provided for bit loading for optical Discrete Multi-Tone Transmission (DMT). In an embodiment, a method for bit loading for optical DMT transmission or reception includes receiving, at a processor, a bit data stream, wherein the bit data stream comprises a plurality of subcarriers; assigning, with the processor, a code rate to each of a plurality of forward error correction (FEC) encoders/decoders according to a mapping of a signal-to-noise-ratio (SNR) to a code rate for each of the subcarriers or subcarrier groups, wherein each FEC encoder/decoder corresponds to a respective one of the subcarriers or a respective subcarrier group; and assigning, with the processor, a modulation format to each subcarrier or each subcarrier group according to a mapping of an SNR for each subcarrier or subcarrier group to a bit number for a corresponding subcarrier or subcarrier group.

Abstract translation: 提供了用于光离散多音传输（DMT）的比特加载的系统和方法实施例。 在一个实施例中，用于光学DMT传输或接收的比特加载的方法包括在处理器处接收比特数据流，其中所述比特数据流包括多个子载波; 根据对每个子载波的信噪比（SNR）与码率的映射，将处理器分配给多个前向纠错（FEC）编码器/解码器中的每一个的码率，或者 子载波组，其中每个FEC编码器/解码器对应于子载波中的相应一个或相应的子载波组; 并且根据对于每个子载波组或子载波组的SNR对应于相应副载波组或子载波组的比特数，将处理器分配给每个子载波组或每个子载波组的调制格式。

公开(公告)号：US20190199443A1

公开(公告)日：2019-06-27

申请号：US16293324

申请日：2019-03-05

Applicant: Huawei Technologies Co., Ltd.

Inventor： Mahdi Zamani ,  Jeebak Mitra ,  Hossein Najafi ,  Zhuhong Zhang ,  Chuandong Li

IPC: H04B10/61

CPC classification number: H04B10/616 ,  H04B10/548 ,  H04B10/5561 ,  H04B10/613 ,  H04B10/614

Abstract: Aspects of the present disclosure are directed in part to a receiver DSP unit including an equalization module. The equalization module includes a trellis-based equalization module that may utilize multiple trellis-based processors (TBP), which can each be individually adaptively configured for performing a trellis-based equalization. The design of the TBPs allows them to be configured for compensating a residual Inter-Symbol Interference (ISI) as well as compensating a residual Phase Noise (PN). ISI is an example of an additive impairment and PN is an example of a multiplicative impairment that communication systems, particularly high speed transmission systems such as coherent optical systems, can suffer from.

公开(公告)号：US09998274B2

公开(公告)日：2018-06-12

申请号：US15353394

申请日：2016-11-16

Applicant: Huawei Technologies Co., Ltd.

Inventor： Mahdi Zamani ,  Mehdi Torbatian ,  Jeebak Mitra ,  Zhuhong Zhang ,  Chuandong Li

IPC: H04B10/00 ,  H04L7/00 ,  H04B10/60

CPC classification number: H04L7/0075 ,  H04B10/60

Abstract: An optical channel between a coherent optical transmitter and a coherent optical receiver may include one or more components that act as a bandpass filter with a passband that is narrower than the signal bandwidth. Such a narrow filter may significantly attenuate the signal content close to the band edge of the data signal. As a result, timing error detection may work less effectively, and therefore clock recovery may be less effective or fail. Methods and systems are disclosed in which a single optical carrier is used to transmit a data signal that has multiple bands, and timing error detection is performed at the receiver using one or more inner bands of the multiple bands. The timing error detection may therefore be made more robust to the effects of the narrow filtering.