PSE device and powered device of optical power supply system, and optical power supply system

An optical power supply system comprising:

• a first data communication device including
• a power sourcing equipment (PSE) device, the PSE device including
• a first semiconductor laser configured to oscillate with electric power, and output feed light, and
• a first transmitter including
• a second semiconductor laser configured to output first laser light, and
• a first modulator configured to modulate the first laser light and output first signal light;
• and
• a second data communication device including
• a powered device comprising a photoelectric conversion element configured to convert the feed light into the electric power, the photoelectric conversion element including a semiconductor region exhibiting a light-electricity conversion effect,
• a receiver configured to demodulate the first signal light to an electric signal, and output the electric signal,
• a data processing unit configured to receive the electric signal and output data based on the electric signal, and
• a second transmitter including
• a third semiconductor laser configured to output second laser light, and
• a second modulator configured to modulate the second laser light to a second signal light based on the data, and output the second signal light to the first data communication device,
• wherein the first data communication device and the second data communication device perform optical communication with each other, and
• the electric power obtained by the conversion of the feed light by the photoelectric conversion element is driving power for the second transmitter and the receiver.