Great advantage of the perfluorinated (PF) polymer base graded index polymer optical fiber (GI POF) in the bandwidth was clarified in detail. The PF polymer base POF has the possibility of achieving the highest bit rate among existing physical media including even silica fiber, since the material dispersion of the PF polymer is lower than those of silica and other polymer materials. Therefore, more than 10Gb/s bit rate transmission for 10giga Ethernet can be achieved by the POF. Campus LAN based on the PF polymer base GI POF is actually installed in Keio University since the last April. System performance is briefly introduced in this paper.