Transmission Method for Optical Communication and Corresponding Device

Patent metadata

Field	Value
Publication number	US-2025080260-A1
Application number	US-202418941621-A
Country	US
Kind code	A1
Filing date	Nov 8, 2024
Priority date	May 10, 2022
Publication date	Mar 6, 2025
Grant date	—

Abstract

This application discloses a transmission method for optical communication. The method is applicable to a plurality of scenarios of over 400 Gbps (including 600 Gbps, 800 Gbps, and the like), such as a metropolitan area network, a backbone network, and data center interconnection. The method includes: generating a frame including a plurality of symbols, where in a polarization direction, the frame includes N FAW frame alignment word symbols, N PS pilot symbols, and N RES reserved symbols, one symbol in every M symbols in the frame is a pilot symbol, and N FAW +N RES =M or N FAW +N RES +1=M; and each of the frame alignment word symbols and the pilot symbols is one of −A−Aj, −A+Aj, A−Aj, and A+Aj, and A is a real number; and transmitting the frame.

First claim

1 . A transmission device for optical communication, comprising one or more memories and one or more processors, wherein the one or more processors is configured to:
generate a frame comprising a plurality of symbols, wherein in a polarization direction of two polarization directions, the frame comprises N FAW frame alignment word symbols, N PS pilot symbols, and N RES reserved symbols, the two polarization directions are orthogonal to each other, in the polarization direction, one symbol in every M symbols in the frame is a pilot symbol, M is an integer greater than 1, and N FAW +N RES =M or N FAW +N RES +1=M; and each of the frame alignment word symbols and the pilot symbols is one of −A−Aj, −A+Aj, A−Aj, and A+Aj, and A is a real number; and transmit the frame.

2 . The transmission device according to claim 1 , wherein in the polarization direction, there is one symbol serving as both a frame alignment word symbol and a pilot symbol in the frame, N FAW +N RES =M, and N FAW +N PS is an odd number.

3 . The transmission device according to claim 2 , wherein the pilot symbols are generated by using a target polynomial and a seed, and a combination of (N FAW +N PS −1) symbols of the N PS pilot symbols and the N FAW frame alignment word symbols achieves direct current balance.

4 . The transmission device according to claim 1 , wherein in the polarization direction, there is no symbol serving as both a frame alignment word symbol and a pilot symbol in the frame, N FAW +N RES +1=M, and N FAW +N PS is an even number.

5 . The transmission device according to claim 4 , wherein the pilot symbols are generated by using a target polynomial and a seed, and a combination of (N FAW +N PS ) symbols of the N PS pilot symbols and the N FAW frame alignment word symbols achieves direct current balance.

6 . The transmission device according to claim 1 , wherein a value of N FAW is 22 or 11.

7 . The transmission device according to claim 1 , wherein the plurality of symbols in the frame are in a 16QAM modulation format, and a value of A is ±1, ±3, or ±√{square root over (5)}.

8 . The transmission device according to claim 1 , wherein a value of M is 64.

9 . The transmission device according to claim 3 , wherein the target polynomial is one polynomial in the following table:

Index
Target polynomial

1
x 10 + x 9 + x 8 + x 6 + x 5 + x 4 + x 3 + x 2 + 1

2
x 10 + x 8 + x 7 + x 6 + x 5 + x 4 + x 2 + x 1 + 1

3
x 10 + x 9 + x 8 + x 5 + 1

4
x 10 + x 9 + x 5 + x 2 + 1

5
x 10 + x 9 + x 8 + x 4 + x 3 + x 2 + 1

6
x 10 + x 9 + x 8 + x 6 + x 5 + x 4 + x 3 + x 2 + 1

7
x 10 + x 9 + x 4 + x 1 + 1

8
x 10 + x 9 + x 8 + x 7 + x 4 + x 1 + 1

9
x 10 + x 9 + x 8 + x 7 + x 6 + x 5 + x 4 + x 1 + 1

10
x 10 + x 8 + x 7 + x 3 + x 2 + x 1 + 1

11
x 10 + x 9 + x 6 + x 3 + x 2 + x 1 + 1

12
x 10 + x 9 + x 6 + x 5 + x 4 + x 3 + x 2 + x 1 + 1

13
x 10 + x 9 + x 6 + x 5 + x 4 + x 3 + x 2 + x 1 + 1

14
x 10 + x 7 + x 3 + x + 1

15
x 10 + x 9 + x 8 + x 6 + x 2 + x 1 + 1

16
x 10 + x 9 + x 8 + x 4 + x 2 + x 1 + 1

17
x 10 + x 9 + x 8 + x 7 + x 5 + x 4 + 1

18
x 10 + x 9 + x 4 + x 2 + 1

19
x 10 + x 9 + x 7 + x 6 + x 5 + x 4 + x 3 + x 2 + 1

20
x 10 + x 8 + x 6 + x 1 + 1

21
x 10 + x 8 + x 7 + x 6 + x 5 + x 4 + x 3 + x 1 + 1

22
x 10 + x 9 + x 8 + x 6 + x 2 + x 1 + 1

23
x 10 + x 9 + x 8 + x 4 + x 2 + x 1 + 1

24
x 10 + x 6 + x 5 + x 3 + x 2 + x 1 + 1

25
x 10 + x 8 + x 4 + x 3 + 1

10 . The transmission device according to claim 9 , wherein in the polarization direction, N PS =97, N FAW =22, and N RES =42 in the frame, M=64, and a quantity N F of symbols in the frame is 6208.

11 . The transmission device according to claim 10 , wherein when the target polynomial and hexadecimal seeds in the two polarization directions are one row in the following table, a normalized amplitude of a sidelobe value of a periodic autocorrelation function of pilot symbols in a same polarization direction is not greater than 0.25, and a normalized amplitude of a periodic cross-correlation function value of pilot symbols in different polarization directions is not greater than 0.25:

Seed in a
Seed in a

polari-
polari-

zation
zation

direc-
direc-

Index
Target polynomial
tion 1
tion 2

1
x 10 + x 9 + x 8 + x 6 + x 5 + x 4 + x 3 + x 2 + 1
0x255
0x3

Assignees

• Huawei Tech Co Ltd

Inventors

• Huang Kechao
• Ma Huixiao
• Yang Xiaoling
• Huang Qinhui

Classifications

• H04B10/2507

  for the reduction or elimination of distortion or dispersion · CPC title

• H04B10/0775

  Performance monitoring and measurement of transmission parameters · CPC title

• H04J14/06

  Polarisation multiplex systems · CPC title

• H04B10/532

  Polarisation modulation · CPC title

• H04L5/00

  Arrangements affording multiple use of the transmission path · CPC title