公开(公告)号：US20240121006A1

公开(公告)日：2024-04-11

申请号：US18264667

申请日：2021-12-08

Applicant: ZTE CORPORATION

Inventor： Jingsong BEI ,  Zhengxuan LI ,  Yiming ZHONG ,  Bo YANG ,  Yingxiong SONG

IPC: H04B10/61

CPC classification number: H04B10/613 ,  H04B10/6166

Abstract: A coherent detection method and device, and an optical transmission system are disclosed. The method may include: acquiring an optical transmission signal and a local oscillator signal, where a frequency value of the local oscillator signal differs from a frequency value of the optical transmission signal by a preset offset frequency value, the preset offset frequency value being smaller than a symbol rate value of the optical transmission signal; obtaining a coupled signal according to the optical transmission signal and the local oscillator signal; converting the coupled signal into an analog signal; sampling the analog signal according to a preset sampling frequency value and converting the analog signal into a plurality digital signals; and processing two digital signals among the plurality of digital signals so that a phase difference between the two digital signals to is 90 degrees.