Large-scale user access oriented LR-PON layout planning method

The invention discloses a large-scale user access oriented LR-PON layout planning method. In an LR-PON, a multi-order optical amplifier is brought in to carry out power compensation on an optical signal, so optical network coverage in a remoter distance and a larger range can be achieved. Network cost minimization serves as the purpose, connectedness of the whole network is guaranteed, and meanwhile, optical fiber coverage is carried out on the basis of an optical network unit, a plurality of candidate optical amplifiers and a plurality of candidate optical splitters. Compared with a traditional PON deployment method, the LR-PON layout planning method is oriented to large-scale user access; a three-stage cascade connection mode is adopted in a framework, a topological structure is ought to have good extendibility and space flexibility, therefore, more users are allowed to have access to the network, and the scale and the coverage range of the network are greatly expanded. Compared with a traditional mathematical modeling prioritization scheme, the LR-PON layout planning method reduces time complexity of calculation, therefore, greatly improves efficiency of engineering calculation, and effectively shortens calculation time.