Full duplex cat eye reverse modulation recovery free space laser communication system

Abstract

The invention relates to a full duplex cat eye reverse modulation recovery free space laser communication system, belongs to the technical field of wireless communication, and solves the problem of low transmission rate of the system in the prior art. A laser I and a transmitting data source are both connected with a DPSK (differential phase shift keying) modulator, the DPSK modulator and a laser II are both connected with an optical fiber amplifier I, two communication lights are amplified and then connected with a port a of a fiber circulator, a port b of the fiber circulator is connected with an optical antenna, a port c of the fiber circulator is connected with a photoelectric detector I, the photoelectric detector I is connected with a DPSK modulator I, a cat eye optical system is coaxially arranged with the optical antenna, an optical filtering beam splitter is arranged between the cat eye optical system and a laser collimating lens and forms an angle of 45 degrees with the cat eye optical system, the laser collimating lens is connected with a port d of a fiber circulator II, a port e of the fiber circulator II, an optical fiber amplifier II and the DPSK modulator II are sequentially connected, the other end of the DPSK modulator is connected with a port f of the fiber circulator II, and a photoelectric detector II is connected with the DPSK modulator.

Description

technical field [0001] The invention relates to a free space laser communication device, in particular to a full-duplex cat's-eye reverse modulation wireless communication device, which belongs to the technical field of wireless communication. Background technique [0002] The working principle of the existing full-duplex free-space laser communication system based on modulation recovery is as follows: by emitting modulated laser light to receive information at the terminal machine based on reverse modulation, and load information through the reverse modulation recovery reflector to reflect back to the original transmitting terminal machine , where the downlink often uses frequency shift keying (FSK) subcarrier modulation, while the uplink often uses circular polarization keying (CPK) modulation, which avoids the interference of single-beam laser modulation information, thus realizing full-duplex Free laser communication, the system is based on reverse modulation and the ret...

AI Technical Summary

Problems solved by technology

[0004] In order to solve the existing problems of the existing full-duplex reverse modulation recovery free space laser communication system, such as large weight and volume, high cost, low communication rate, limited communication distance, and poor anti-atmospheric turbulence effect, the present invention proposes a full-duplex Inverse Modulation and Reply Free Space Laser Communication System of Industrial Cat's Eye

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