Method and system of optical communication with high spectral efficiency and low power consumption based on joint channel coding modulation

An optical communication system with high spectral efficiency and low power consumption based on joint channel coding modulation, wherein the optical communication system is applied to an optical communication method with high spectral efficiency and low power consumption based on joint channel coding modulation, and the optical communication system comprises:

• a data acquisition module, a symbol multiplexing module, a signal communication module, a channel equalization module, and a symbol demultiplexing module;
• wherein
• the data acquisition module, configured to acquire signal source data generated by user information;
• the symbol multiplexing module, configured to perform channel coding and rate matching on the signal source data based on a forward error correction of a polar code, send the signal source data to an interleaver for interleaving, and send the signal source data to a symbol multiplexer for many-to-one mapping and high order modulation to obtain a high spectral efficiency symbol multiplexing signal modulated by high spectral efficiency and short code joint channel coding;
• the signal communication module, configured to carry out digital-to-analog conversion and polarization multiplexing IQ modulation on the high spectral efficiency symbol multiplexing signal to realize electro-optical conversion to generate an optical signal, send the optical signal to the fiber for communication to an optical receiver;
• the optical receiver receives the optical signal by adopting a coherent detector, and then carries out analog-to-digital conversion to collect data to obtain an analog-to-digital converted signal;
• the channel equalization module, configured to obtain constellation information of a communication signal by performing clock recovery preliminarily, dispersion compensation, polarization demultiplexing, frequency offset compensation, and phase recovery on the analog-to-digital converted signal;
• and
• the symbol demultiplexing module, configured to obtain a signal constellation point of constellation information of the communication signal, realize a bit interleaving polarization demodulation and iterative decoding process through multi-module iterative decoding based on soft information interaction, realize joint symbol demultiplexing and FEC decoding, and recover information bit data of a data source.