MRR-FSO duplex communication device based on LDPC codes and micro pyramid prism array

The invention discloses an MRR-FSO duplex communication device based on an LDPC code and a micro pyramid prism array. The system comprises an optical transceiver and a reverse modulator, the optical transceiver comprises a light source device, an optical antenna device, an LDPC encoding/decoding device and a photoelectric detection device, and the reverse modulator comprises an optical antenna device, a reverse modulation device, an LDPC encoding/decoding device and a photoelectric detection device; optical transceiver information is loaded on an infrared band optical carrier after being subjected to channel coding by an LDPC coding device, and an optical antenna device transmits a modulated infrared light signal and an unmodulated visible light carrier to the atmosphere. An LDPC decodingdevice of the reverse modulator carries out optical transceiver information recovery on an optical signal collected by the photoelectric detection device, Meanwhile, information of the reverse modulator is modulated on a visi