Method and system for determining judgment threshold value of multi-path asynchronous wavelength label signal

The invention relates to a method and a system for determining a judgment threshold value of a multi-path asynchronous wavelength label signal, and relates to the technical field of optical communication, and the method comprises the steps: carrying out the demodulation of a target wavelength label signal when the target wavelength label signal obtained after positive and negative alternate coding is received, and obtaining a judgment threshold value of the target wavelength label signal; obtaining a signal power value corresponding to each bit in the target wavelength label signal; performing iterative calculation based on the signal power values to obtain an average signal power value and a noise power value corresponding to each bit; and calculating a judgment threshold value corresponding to each bit based on the average signal power value and the noise power value. According to the method, the probability of transmitting a bit 0 and a bit 1 in unit time is stabilized at a level of 50% through positive an