PM-16QAM相干光通信的偏振模色散研究

dvanced modulation format, polarization multiplexing, coherent detection and digital signal processing have become the key technologies for next-generation optical transmission systems. Using the powerful digital signal processing in the field of electronics, coherent optical receivers can well compensate for transmission losses such as chromatic dispersion, polarization mode dispersion (PMD), and laser phase noise, etc. This thesis investigates the 16QAM coherent optical communication system with polarization multiplexing to analyze the polarization mode dispersion (PMD) in the channel and analyze the generation principle, and uses a butterfly filter for polarization demultiplexing and polarization mode dispersion (PMD) equalization. The polarization demultiplexing (PMD) and polarization mode dispersion (PMD) equalization are carried out by using butterfly filters. The traditional polarization demultiplexing algorithm (CMA) has only one mode value, and the error cannot be reduced to zero for 16QAM multimode signals, and for 16QAM and other multimode signals, multimode algorithms such as RDE and CMMA are used to compensate the signals, and the performance of the algorithms is verified by constructing PM-16QAM coherent optical communication system. The performance of the algorithm is verified by building a PM-16QAM coherent optical communication system, and the simulation results show that the multimode algorithms RDE and CMMA can better equalize the polarization mode dispersion in PM-16QAM..