A perfluorinated graded index polymer optical fiber (PFGI-POF) has been developed and manufactured for data communication to provide a high bandwidth with easy termination and cabling. In the PFGI-POF technology, the graded refractive index profile using dopants is a key technology to obtain a high bandwidth, excellent transparency and thermal durability. This study of the dopant selection for the PFGI-POF is reported for the first time.