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

An optical power supply system, comprising:

• a power sourcing equipment;
• and
• a powered device,
• wherein the power sourcing equipment comprises:
• a first semiconductor laser that oscillates with electric power, thereby outputting feed light to the powered device;
• a second semiconductor laser for signals;
• a first modulator that modulates laser light output by the second semiconductor laser for signals to first signal light and outputs the first signal light to the powered device;
• and
• an optical receiver,
• wherein a first semiconductor material of the first semiconductor laser is a first medium having a first wavelength of 500 nm or less,
• wherein the powered device comprises:
• a photoelectric conversion element that converts the feed light output by the power sourcing equipment into electric power;
• a third semiconductor laser for signals;
• and
• a second modulator that modulates laser light output by the third semiconductor laser to second signal light and outputs the second signal light to the power sourcing equipment,
• wherein the optical receiver of the power sourcing equipment receives and converts the second signal light transmitted from the powered device into an electrical signal corresponding to transmission data, and
• wherein a second semiconductor material of the photoelectric conversion element is a second medium having a second wavelength of 500 nm or less.