OPTICAL FIBER POWER SUPPLY SYSTEM

To improve the optical power supply efficiency, a power-over-fiber system includes a power sourcing equipment 110 including a semiconductor laser that oscillates with electric power to output feed light, a powered device 310 including a photoelectric conversion element 311 that converts the feed light into electric power, a plurality of optical fiber cables 200A that transmit the feed light, a measurer 150A that measures a distance from the power sourcing equipment to the powered device, and a control device 153A that controls the power sourcing equipment to output the feed light after compensating for an amount of attenuation of the feed light according to a transmission distance on the basis of the distance from the power sourcing equipment to the powered device measured by the measurer.