Free Space Optical Communication Based On Quantum Imaging Technology

In recent years,with the rapid development of optical communication,free space optical communication technology has become one of the hot research fields.Quantum imaging technology is a new imaging technique which uses the intensity fluctuation of light field to carry on the correlation imaging.Compared with the traditional imaging method,with a strong anti-jamming capability,which can realize imaging under complex environment,can eliminate,scattering medium such as atmospheric turbulence channel environment influence on imaging quality,range,low light band requirements etc.In this paper,quantum imaging technology is applied in the research of free space optical communication technology.The paper mainly completes the following work:1.Proposed a new quantum imaging-free space optical communication scheme.Combination of quantum imaging technology,using computer generated random speckle figure to transmit signal pattern is encoded,using the second order correlation of quantum imaging signal decoding arithmetic formula,theoretical derivation in the presence of atmosphere turbulence and scattering media channel signal transmission equation,and the transmission characteristics are analyzed.2.Constructed the experimental platform of quantum imaging-free space optical communication scheme.Transmitter using liquid crystal spatial light modulator to transmit signal decoding,the receiver uses the silicon detector for transmission signal acquisition,according to the theory of quantum imaging signal demodulation of recovery.The experiment verifies the feasibility of the quantum image-free space optical communication scheme,which is consistent with the experimental results.At the same time,because of single pixel at transmitter detector to detect signals and convert optical signals into electrical signals directly,in principle is no longer needed will light signal coupled into the fiber,simplify and system optimization for free space optical communication equipment provides a new train of thought.3.The influence of the scattering media on the light communication quality is investigated.The influence of the concentration of different scattering media on signal transmission in atmospheric channel is studied by using cow fat milk as a strong scattering medium.Experimental results show that the optical communication scheme based on quantum imaging technology has excellent anti-scattering media capability.4.The influence of the turbulence effect on the optical communication quality is investigated.By adding fluorescent lamps on the side of atmospheric channel,the effect of noise on optical communication is simulated by simulating atmospheric turbulence.The experimental results show that the free space optical communication scheme proposed in this paper has good anti-turbulence capability.5.In view of the existing experimental conditions,the presence of strong scattering medium and atmospheric turbulence,image restoration using Gaussian random speckle coding signal quality is not ideal,the Hadamard matrix with random speckle matrix to construct a new transmission signal coding scheme,the numerical simulation results prove that effectively improve the quality of the communication.6.Based on the optical design software mastered during the enterprise practice,an optical lens fabrication scheme was completed independently,and the processing process was also given.