公开(公告)号：US10097276B2

公开(公告)日：2018-10-09

申请号：US15455645

申请日：2017-03-10

Applicant: Beijing University of Posts and Telecommunications

Inventor： Yan Li ,  Miao Yu ,  Jian Wu ,  Jiangchuan Pang ,  Deming Kong

IPC: H04L1/00 ,  H04B10/516 ,  H04B1/00 ,  H04B10/556

Abstract: The embodiments of the present application disclose a method and device for sending and receiving an optical signal. The method for sending an optical signal comprises: performing serial-to-parallel conversion on a data signal to be transmitted to obtain an I path data sequence, a Q path data sequence and a PPM path data sequence which are in parallel; performing mPQ-encoding on the I path data sequence, the Q path data sequence and the PPM path data sequence to obtain an I path and a Q path of an mPQ-encoded digital signal; shaping the I path and the Q path of the mPQ-encoded digital signal by Nyquist-filtering to obtain an I path and Q path of a filtered digital signal; performing digital-to-analog conversion on the I path and the Q path of the filtered digital signal and mapping the converted I path and Q path onto an optical carrier to obtain a target optical signal and send the same. By applying the embodiments of the present application, spectral efficiency loss in optical communication can be reduced or even eliminated while power efficiency is increased.

公开(公告)号：US09742491B2

公开(公告)日：2017-08-22

申请号：US14726655

申请日：2015-06-01

Applicant: Beijing University of Posts and Telecommunications

Inventor： Jifang Qiu ,  Bo Yuan ,  Jian Wu ,  Yan Li ,  Xiaobin Hong ,  Hongxiang Guo ,  Jintong Lin

IPC: H04B10/08 ,  H04B17/00 ,  H04B10/06 ,  H04B10/079

CPC classification number: H04B10/07953

Abstract: An apparatus and a method for monitoring in-band OSNR (Optical Signal-to-Noise Ratio) which monitors the in-band OSNR by using two parallel Mach-Zehnder-interferometers with different optical time delays are disclosed. The apparatus and method can be resistant to chromatic dispersion, polarization mode dispersion and polarized noise, can measure the coherence characteristics of the signal without removing the noise, and can be manufactured into a semiconductor integrated device and be applied in the future high-speed optical network.