The invention relates to a method for optimizing a multi-grade light-splitting
passive optical network of a distribution communication network. The method is that the network at the current grade bears the
gene optimization result of the network at the previous grade through the cascading
genetic algorithm. The method specifically comprises the steps of designing a
gene code; creating constraint conditions for the
gene code, and selecting adaptability functions; performing
crossover and variation operation for the
gene code on the premise that the constraint conditions for the
gene code are met; performing multi-generation iterative
crossover and variation operation to obtain the optimal
gene code of the PON network at the current level; returning to step (1) to bear the gene code of previous level when the number of the network
layers of the multi-grade light-slitting
passive optical network is less than n, and updating the adaptability function; finishing the optimization when the number of the network
layers of the multi-grade light-slitting
passive optical network is more than 1. According to the method, the optimal light splitter and relatively high network star topology in the network are selected from the optimized multi-grade light-splitting network, and therefore, the
network communication construction cost is saved; the network planning is constructed into a
mathematical model, thus the expandability is improved, and the calculation complexity is reduced.