公开(公告)号：US20240372612A1

公开(公告)日：2024-11-07

申请号：US18310200

申请日：2023-05-01

Applicant: HUAWEI TECHNOLOGIES CO., LTD.

Inventor： Zhiping JIANG ,  Qingyi GUO ,  Xuefeng TANG

IPC: H04B10/079

Abstract: The disclosed systems and methods for determining spectrum-resolved signal-to-noise ratio (SNR) in an online dense wavelength division multiplexing (DWDM) optical link, the method comprising: i) receiving a noise affected optical signal; ii) converting the received optical signal into a digital signal; iii) processing the digital signal to extract the noise affected transmitted signal; iv) decoding the noise-affected transmitted signal and reconstructing an original transmitted signal; v) converting the noise-affected transmitted signal into frequency domain noise-affected transmitted signal; vi) converting the original transmitted signal into frequency domain original transmitted signal; vii) selecting spectrum slices from the frequency domain noise-affected transmitted signal and the frequency domain original transmitted signal; viii) converting the spectrum slices into time domain portions of the noise-affected transmitted signal and the original transmitted signal respectively; ix) correlating the time domain portions of the noise-affected transmitted signal and the original transmitted signal; and x) determining the spectrum-resolved SNR.