OPTICAL FIBER POWER FEED SYSTEM

A power over fiber system 1 includes: a power sourcing equipment 110 including a semiconductor laser 111 that oscillates with electric power, thereby outputting feed light 112; a powered device 310 including a photoelectric conversion element 311 that converts the feed light 112 from the power sourcing equipment 110 into electric power; an optical fiber cable 200 that transmits the feed light 112 from the power sourcing equipment 110 to the powered device 310; and a temperature sensor 312 that detects a temperature of the photoelectric conversion element 311, wherein a process of lowering an output level of the feed light 112 is performed in response to the temperature detected by the temperature sensor 312 being equal to or higher than a predetermined threshold value, and a process of raising the output level of the feed light 112 is performed in response to the detected temperature being lower than the predetermined threshold value.