A power over fiber system includes a power sourcing equipment, a powered device, an optical fiber cable and an openable/closeable or attachable/detachable lid member. The power sourcing equipment includes a semiconductor laser that oscillates with electric power, thereby outputting feed light. The powered device includes a photoelectric conversion element that converts the feed light output by the power sourcing equipment into electric power. The optical fiber cable transmits the feed light from the power sourcing equipment to the powered device. The feed light is invisible light. The lid member covers an outgoing portion from which the feed light goes out. At least part of a light receiving portion of the lid member, the light receiving portion receiving the feed light, is made of a wavelength conversion material that converts a wavelength of the feed light into a wavelength of visible light.