Optical power supply system

An optical power supply system, comprising:

• a power sourcing equipment that outputs feed light;
• an optical branching device to which the feed light from the power sourcing equipment is input and to which a plurality of powered devices that convert the feed light into electric power is connectable;
• a detector that detects the number of powered devices connected to the optical branching device;
• a power supply controller that, based on the number of connected powered devices detected by the detector, controls output of the feed light from the power sourcing equipment;
• an optical fiber cable that transmits the feed light from the power sourcing equipment to the optical branching device;
• and
• a connection detecting part that is provided at a power receiving side of the optical fiber cable, and when detecting that a powered device of the powered devices is connected to the optical branching device, transmits, to the detector, a notifying signal notifying the detection,
• wherein the detector is provided at a power supplying side of the optical fiber cable, and
• wherein when receiving the notifying signal from the connection detecting part, the detector outputs a signal to the optical branching device, and detects whether the powered device of the powered devices is connected to the optical branching device by presence or absence of a return signal therefrom, thereby detecting the number of connected powered devices.