Photon probability shaping signal transmission method based on few-mode multi-core optical fiber

Abstract

The invention discloses a photon probability shaping signal transmission method based on a few-mode multi-core optical fiber. The method comprises the following steps: carrying out probability shapingconstellation mapping on multiple paths of parallel bit data streams to obtain a 16QAM signal; enabling a modulator to modulate a 16QAM signal to laser, and then converting the 16QAM signal into a signal in a high-order mode after mode conversion; enabling a few-mode multi-core optical fiber entry mode multiplexer to realize different-mode transmission and space division multiplexing of differentprobability signals; enabling a receiving end to carry out demultiplexing through a space division mode division multiplexer, decomposing the optical signal into multiple signals, sending the signalsto a photoelectric detector for detection, converting the optical signal into an electric signal to obtain multiple 16QAM signals, and carrying out dispersion compensation on the converted 16QAM signals; carrying out MIMO equalization processing on the 16QAM signal symbol in an MIMO equalizer by applying an adaptive step length equalization algorithm so as to carry out compensation mode couplingand modal delay; and finally, performing corresponding probability shaping constellation de-mapping and digital signal processor processing to obtain initial bit data.

Description

technical field [0001] The invention belongs to the technical field of communication technology, and in particular relates to a photon probability shaping signal transmission method based on a few-mode multi-core optical fiber. Background technique [0002] As social networks, streaming media, and online games have profoundly changed people's lives, Internet data traffic has begun to increase, and people's demand for bandwidth has increased dramatically. According to Cisco's analysis, the global network protocol communication capacity will grow at a compound annual growth rate of 23% from 2014 to 2019. The transmission system capacity of traditional single-mode fiber is close to the capacity limit of nonlinear Shannon theory, and the telecommunications industry will soon reach capacity crunch, and the optical communication network with single-mode fiber as the backbone is facing severe challenges. Researchers in related technologies have found that few-mode multi-core optic...

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Problems solved by technology

And the time delay between the various modes will cause some components to repeatedly couple into and out of one mode, thus causing crosstalk similar to the multipath effect

Traditional few-mode multi-core optical fiber transmission uses the same probability distribution for each mode, which has the problems of fundamental mode crosstalk and low spectral efficiency

And the channel is easily limited by nonlinear power

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