US 12,519,546 B2Granted

Transmission method and reception method for optical communication, and corresponding device

AssigneeHuawei Technologies Co., Ltd.

InventorsKechao Huang, Wai Kong Raymond Leung

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Abstract

A transmission method for optical communication and a related device and system are provided, which may be applied to various scenarios such as a metropolitan area network, a backbone network, and data center interconnect of over 400 Gbps (including 600 Gbps, 800 Gbps, and the like). The method includes: generating a super-frame including a plurality of sub-frames; and transmitting the super-frame, wherein each sub-frame includes training symbols and pilot symbols, and each of the training symbols and the pilot symbols is one of −A−Aj, −A+Aj, A−Aj, and A+Aj, A being a real number. In addition, in the training symbols and the pilot symbols included in each sub-frame, quantities of −A−Aj, −A+Aj, A−Aj, and A+Aj in two mutually perpendicular polarization directions meet specific requirements, so that direct current balance can be achieved, which helps a receiver end restore a signal.

Claims40

Dependent claims

A transmitting device comprising one or more memories and one or more processors, wherein the one or more processors are configured to:

generate a super-frame comprising a plurality of sub-frames, wherein each sub-frame comprises training symbols and pilot symbols;
in one polarization direction, a sum of quantities of training symbols and pilot symbols comprised in the sub-frame is not less than 5, and there is one symbol that is both a training symbol and a pilot symbol;
and each of the training symbols and the pilot symbols is one of −A−Aj, −A+Aj, A−Aj, or A+Aj, A being a real number;
wherein in the training symbols and the pilot symbols comprised in each sub-frame, quantities of −A−Aj, −A+Aj, A−Aj, and A+Aj in one polarization direction are respectively └(NTS+NPS−1)/4┘, (NTS+NPS−1)/2−└(NTS+NPS−1)/4┘, (NTS+NPS−1)/2−└(NTS+NPS−1)/4┘, and └(NTS+NPS−1)/4┘, and quantities thereof in the other polarization direction are respectively (NTS+NPS−1)/2−(NTS+NPS−1)/4┘, └(NTS+NPS−1)/4┘, └(NTS+NPS−1)/4┘, and (NTS+NPS−1)/2−└(NTS+NPS−1)/4┘, wherein NTS is a quantity of the training symbols in each sub-frame in one polarization direction, NPS is a quantity of the pilot symbols in each sub-frame in one polarization direction, NTS+NPS is an odd number, and the two polarization directions are orthogonal to each other;
and
transmit the super-frame.

3 more elements

A receiving device comprising one or more memories and one or more processors, wherein the one or more processors are configured to:

receive a super-frame comprising a plurality of sub-frames, wherein each sub-frame comprises training symbols and pilot symbols;
in one polarization direction, a sum of quantities of training symbols and pilot symbols comprised in the sub-frame is not less than 5, and there is one symbol that is both a training symbol and a pilot symbol;
and each of the training symbols and the pilot symbols is one of −A−Aj, −A+Aj, A−Aj, or A+Aj, A being a real number;
wherein in the training symbols and the pilot symbols comprised in each sub-frame, quantities of −A−Aj, −A+Aj, A−Aj, and A+Aj in one polarization direction are respectively └(NTS+NPS−1)/4┘, (NTS+NPS−1)/2−└(NTS+NPS−1)/4┘, (NTS+NPS−1)/2−└(NTS+NPS−1)/4┘, and └(NTS+NPS−1)/4┘, and quantities thereof in the other polarization direction are respectively (NTS+NPS−1)/2−└(NTS+NPS−1)/4┘, └(NTS+NPS−1)/4┘, └(NTS+NPS−1)/4┘, and (NTS+NPS−1)/2−└(NTS+NPS−1)/4┘, wherein NTS is a quantity of the training symbols in each sub-frame in one polarization direction, NPS is a quantity of the pilot symbols in each sub-frame in one polarization direction, NTS+NPS is an odd number, and the two polarization directions are orthogonal to each other;
and
decode the received super-frame.

3 more elements

A communication system comprising a transmitting device and a receiving device, wherein the transmitting device is configured to:

generate a super-frame comprising a plurality of sub-frames, wherein each sub-frame comprises training symbols and pilot symbols;
in one polarization direction, a sum of quantities of training symbols and pilot symbols comprised in the sub-frame is not less than 5, and there is one symbol that is both a training symbol and a pilot symbol;
and each of the training symbols and the pilot symbols is one of −A−Aj, −A+Aj, A−Aj, or A+Aj, A being a real number;
wherein in the training symbols and the pilot symbols comprised in each sub-frame, quantities of −A−Aj, −A+Aj, A−Aj, and A+Aj in one polarization direction are respectively └(NTS+NPS−1)/4┘, (NTS+NPS−1)/2−└(NTS+NPS−1)/4┘, (NTS+NPS−1)/2−└(NTS+NPS−1)/4┘, and └(NTS+NPS−1)/4┘, and quantities thereof in the other polarization direction are respectively (NTS+NPS−1)/2−└(NTS+NPS−1)/4┘, └(NTS+NPS−1)/4┘, └(NTS+NPS−1)/41, and (NTS+NPS−1)/2−└(NTS+NPS−1)/4┘, wherein NTS is a quantity of the training symbols in each sub-frame in one polarization direction, NPS is a quantity of the pilot symbols in each sub-frame in one polarization direction, NTS+NPS is an odd number, and the two polarization directions are orthogonal to each other;
and
transmit the super-frame;
wherein the receiving device is configured to:
receive the super-frame;
and
decode the received super-frame.

7 more elements

Dependencies are inferred from the claim text.

Facts

Application: 18/490,448Filed 19 Oct 2023 · continuation
Priority: CN 202110424596.820 Apr 2021
Published: US 2024/0178920 A130 May 2024
Granted: 6 Jan 2026
Term ends: Not estimatedThe source records don’t support an estimate.

Classification9 codes

H04B 10/541
Intensity modulation: digital intensity or amplitude modulation
H04L 27/2613
Details of reference signals: structure of the reference signals
H04B 10/532
Details of coding or modulation: polarisation modulation
H04B 10/612
Coherent receivers: for optical signals modulated with a format different from binary or higher-order PSK [X-PSK], e.g. QAM, DPSK, FSK, MSK, ASK