A power over fiber system includes an optical fiber cable. The optical fiber cable includes a core, a first cladding and a second cladding. The core transmits signal light. The first cladding is positioned in contact with periphery of the core and transmits feed light. The second cladding is positioned in contact with periphery of the first cladding. Radial refractive index distribution of the first cladding is distribution in which refractive index gradually decreases from a local maximum at an internal point toward points where the first cladding is in contact with the core and the second cladding, respectively. The internal point is away from the core and the second cladding. The refractive index of the core is higher than the refractive index of the first cladding at the point where the first cladding is in contact with the core.