Reverse modulation free space optical communication system based on pseudo phase conjugate reflector

Abstract

The invention discloses a reverse modulation free space optical communication system based on a pseudo phase conjugate reflector. The system is composed of an optical transceiver end and a reverse modulator end. The optical transceiver end comprises an optical transmitting module and a first optical detector module. The reverse modulator end comprises a second optical detector module and a reverse modulator module. The reverse modulator module is composed of a pseudo phase conjugate reflector, a spatial light modulator and a signal input unit, can modulate and reversely reflect an optical signal, and can eliminate the influence of atmospheric turbulence of any strength under certain conditions. The reverse modulator module can be integrated with a cat's eye lens or other optical systems with similar functions, and the field angle of the reverse modulator module after integration can be expanded. The reverse modulator end of the system has low power consumption and a compact structure, and is suitable for working in places with limited resources. Therefore, the reverse modulation free space optical communication system has many important applications, such as micro satellite / unmanned aerial vehicle communication, target identification, and environmental monitoring.

Description

technical field [0001] The invention belongs to the technical field of wireless communication, relates to a laser communication technology, in particular to a reverse modulation free-space optical communication system based on a pseudo-phase conjugate reflector. Background technique [0002] Free-space optical communication is often defined as a communication technology that uses laser beams to carry information from one point to another. It combines the advantages of radio communication and optical fiber communication. It not only has the advantages of large channel capacity, strong anti-interference ability, strong anti-eavesdropping ability, and no need for spectrum license, but also does not need to lay communication cables and is easy to install and maintain. Therefore, free-space optical communication is an effective way to solve the "last mile" problem. It can also be used as a supplementary technology for radio communication and optical fiber communication, and can b...

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Problems solved by technology

[0003] In order to solve the above-mentioned problem of limited distance of reverse modulation free-space optical communication caused by atmospheric turbulence, the present invention proposes an improvement measure, which is to use a pseudo-phase conjugate reflector as a retroreflector, which can effectively reduce the distance caused by atmospheric turbulence. The beam flickers and drifts to increase the effective reflected light intensity, thereby increasing the communication distance and transmission quality of reverse modulation free space optical communication

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