Optical signal processing method and device based on tcm-probability shaping

Abstract

The embodiment of the invention provides an optical signal processing method and device based on TCM-probability forming, and the method comprises the steps: carrying out the subset segmentation of apreset constellation diagram, and obtaining a constellation diagram subset; performing convolutional coding on a third preset number of paths of first data in the first preset number of paths of firstdata to obtain a coding sequence; performing constellation point distribution matching on a fourth preset number of paths of first data in the first preset number of paths of first data to obtain a bit sequence, wherein the probability that the fourth preset number of paths of first data are distributed and matched to different constellation points in a constellation diagram subset is determinedbased on the distance between each constellation point and a coordinate origin, and the probability is reduced along with the increase of the distance; performing constellation mapping on the bit sequence based on the determined constellation diagram subset to obtain a first complex signal; and performing optical modulation on the first complex signal to obtain a modulated optical signal, and sending the modulated optical signal. According to the embodiment of the invention, the average power of the signal sent by the system can be reduced.

Description

technical field [0001] The invention relates to the technical field of optical communication, in particular to an optical signal processing method and device based on TCM-probability shaping. Background technique [0002] In optical fiber communication systems, forward error correction coding technology is widely used, which can effectively reduce the bit error rate of the system. Among them, TCM (Trellis Coded Modulation, Trellis Coded Modulation) technology is a technology that does not increase the transmission bandwidth, does not reduce the Under the condition of information transmission rate, obtain the forward error correction coding technology of 3~6Db coding gain. The principle of TCM is to use the redundancy brought by FEC (Forward Error Correction) to expand the signal set, and to offset the gain loss caused by the expansion of the signal set by increasing the self-distance of the coding sequence and obtain a certain gain. [0003] Currently in TCM, the original ...

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Problems solved by technology

[0004] In the existing TCM technology, in the constellation diagram, the energy of a constellation point is positively correlated with the modulus value of the complex information corresponding to the constellation point and the amplitude of the optical signal loaded on the carrier after the signal is mapped to the constellation point, Therefore, the energy of constellation points far away from the coordinate origin is higher, and the energy of constellation points close to the coordinate origin is lower

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