Environment self-adaptive 'laser sheath' auxiliary laser communication device and method based on wavefront phase modulation

Abstract

The invention discloses an environment self-adaptive 'laser sheath' auxiliary laser communication device and a method based on wavefront phase modulation. The invention belongs to the technical fieldof free space laser communication. The ultrashort pulse light is filamented in the atmosphere to generate laser sheath auxiliary signal light to pass through turbulence; according to the device, the wavefront phase modulator is used for tuning the wavefront phase of the pulse light and simultaneously controlling the variable-magnification beam expander, the zoom lens module and the ultra-short pulse laser to realize tunable laser sheath spatial distribution so as to achieve the real-time and optimal auxiliary effect on the signal light. According to the device and the method, a complex nonlinear process of laser filamentation and a time-varying link environment are subjected to black box treatment; the ultra-short pulse light beam is tuned, the defects of difficult control of laser sheathspace distribution and large auxiliary performance fluctuation are overcome, the advantages of strong turbulence resistance and environment self-adaptation are achieved, long-distance and high-stability auxiliary laser communication can be realized, and the rapid application of the emerging technology of laser sheath auxiliary optical communication is facilitated.

Description

technical field [0001] The invention belongs to the technical field of free space laser communication, in particular the application of ultrashort pulse optical nonlinear transmission to free space laser communication. Combining the excellent phase modulation characteristics of the spatial light modulator, the present invention designs an environment-adaptive "laser sheath" auxiliary laser communication device and method based on wavefront phase modulation, which can be used in the fields of satellite-ground laser communication, atmospheric laser communication, etc. Auxiliary signal optical transmission, while optimizing system parameters, minimize the impact of link environment fluctuations, especially suitable for applications of laser communication under strong turbulence and long distances. Background technique [0002] Free space laser wireless communication is a communication technology that uses the atmosphere as the transmission medium and laser as the carrier to tra...

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Problems solved by technology

[0005] The invention aims to solve the problem that the auxiliary performance decreases or even fails due to the change of the communication link environment when the "laser sheath" assists laser communication, and handles the complex influence of environmental factors on the nonlinear transmission of pulsed light as a "black box", and proposes a An Environment Adaptive "Laser Sheath" Assisted Optical Communication Device and Method Based on Wavefront Phase Modulation and Beam Shaping Method

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