用BeamPROP软件对熔融型光纤分路器偏振相关损耗的研究

In this paper, the fundamental principles of BPM(Beam Propagation Method) used to simulate and calculate the process of the beam propagation is first introduced. Then two kinds of the model of the coupling area usually used in the theoretical research are briefly introduced. After that, this paper carefully simulated the two kinds of model, and the calculated results show the relationship of the PDL and D under different pulling-length and splitting ratio, and found the minimum value of the PDL. Finally this paper compared and analyzed the theoretical and the experimental results, and summed up the reasons for the difference between them.