Method and device for generating optical signal based on geometric-probability shaping

Abstract

An embodiment of the invention provides a method and a device for generating an optical signal based on geometric-probability shaping. The method comprises the following steps: acquiring original datato be sent; determining, according to sequence numbers of each constellation subset, a subset serial number sequence obeying the optimal distribution corresponding to the original data, and determining a binary sequence of the subset serial number sequence obeying the optimal distribution corresponding to the original data according to binary labels of each of the constellation subsets, wherein the constellation subsets are obtained by performing subset division on the multi-mode circular constellation after performing geometric forming on square constellation diagrams of the preset number ofconstellation points to obtain a multi-mode circular constellation; systematically coding the binary sequence to obtain the encoded information; sequentially selecting a first preset number of information bits and a second preset number of redundant bits for the encoded information, and mapping the above bits to the multi-mode circular constellation to obtain an optical signal to be transmitted.This embodiment enables the transmitted light signal to approximate the Shannon channel capacity.

Description

technical field [0001] The invention relates to the technical field of optical fiber communication, in particular to a method and device for generating an optical signal based on geometry-probability shaping. Background technique [0002] Optical fiber communication uses laser as the carrier and optical fiber as the transmission medium. It has the advantages of huge carrier resources and small transmission attenuation. It can provide network data services for the growing information needs of human beings. [0003] In optical fiber communication systems, traditional QAM (Quadrature Amplitude Modulation, Quadrature Amplitude Modulation) has been widely used, which can effectively reduce the hardware requirements of the transmitter part. However, the Shannon channel capacity cannot be achieved only by using a uniform M-QAM constellation, especially in the case of a low modulation order, and its performance loss approaches πe / 6 (1.53dB), which is the constellation shaping gain. ...

AI Technical Summary

Problems solved by technology

However, in terms of hardware, Huffman coding requires more buffer space to store the prefix of the Huffman code; the method of using probability amplitude shaping can only be used for symmetric constellations, and cannot be applied to other types of asymmetric constellations This method; the way of shell mapping makes it difficult to find a shell with the lowest energy during implementation

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