A New Method to Fabricate GI-POF Rod and its RID Adjustment

Graded index polymer optical fiber (GI-POF) has been an important research topic in the world for its special advantages such as a large bandwidth. The existing methods to fabricate GI-POF have only limited abilities to regulate the refractive index distribution (RID), which has a strong effect to the bandwidth in the fibers and those need improvement. In this paper a new method to fabricate GI-POF preform called multi-layer polymerization in a centrifugal field was given and this method could control the RID freely. The regulating methods were explained by theory simulation and calculation, and the effects of reaction temperature were also discussed. The results indicated that the RID of GI-POF preform would approach the optimal distribution gradually with the layers of polymer increased, and the reaction temperature has little effect to the RID.