PDM-DQPSK signal polarization demultiplexing method, system and device

• Main Authors: TANAKA SEI, CHAI XUDONG, WANG XIAOZHOU, YI CAI, ZHOU JUN, JIANG CHENXU
• Format: Patent
• Language: Chinese; English
• Published: 05.04.2024
• Subjects: ELECTRIC COMMUNICATION TECHNIQUE; ELECTRICITY; TRANSMISSION

The invention relates to a PDM-DQPSK signal polarization demultiplexing method, system and device, and the method comprises the steps: separating a transmitted PDM-DQPSK signal into h and v paths of signal components in an orthogonal polarization direction, carrying out the frequency mixing operation of the h and v paths of signal components with delayed signal components, and obtaining two groups of differential signals; performing square law detection on the signal components of the h path and the v path at the same time to obtain signal power of the h path and the v path in the orthogonal polarization direction; and taking a first group of reference signals obtained based on the training sequence of the PDM-DQPSK signals as initial values, carrying out field recovery and iterative recovery on the next group of signals by using the previous group of signals until all the signals are recovered, and carrying out polarization demultiplexing on the deconjugated signals to obtain a recovered sending signal seque