研究了聚合塑料光纤纤芯聚甲基丙烯酸甲酯（ＰＭＭＡ）预制棒时，掺入不同含量分子量调节剂对塑料光纤各项性能的影响。并采用丙烯酸丁酯（ＢＡ）与甲基丙烯酸甲酯（ＭＭＡ）共聚的方法制取纤芯预制棒，考察其共聚比例与光纤性能的关系。在此基础上，寻找比较合适的分子量调节剂含量及共聚比例。 The effects of different molecular weight modifiers on the properties of plastic optical fiber were studied when polymerized plastic optical fiber core PMMA preform. The core preform was prepared by the copolymerization of butyl acrylate (BA) and methyl methacrylate (MMA), and the relationship between the copolymerization ratio and the properties of the optical fiber was investigated. On this basis, look for more appropriate molecular weight regulator content and copolymerization ratio.