The Key Laboratory of Adaptive Optics, Institute of Optoelectronics Technology, Chinese Academy of Sciences, has made new progress in the application of adaptive optics (AO) technology to space coherent laser pointer communication systems: high quality of 5Gbps under moderate atmospheric turbulence has been achieved in the laboratory The effect of spatial coherent laser communication.
It is verified that AO technology can improve the availability of coherent laser communication systems, and has extremely high application value in coherent laser communication systems of horizontal atmosphere and satellite-to-ground links. Coherent laser communication has the advantages of high sensitivity, fast potential communication rate, strong anti-interference ability, and high confidentiality. It has huge application requirements and broad market prospects in communication fields such as large-capacity satellite communication and local broadband data transfer station access. The key technology for realizing the integrated high-speed communication network in the future.
Due to the fluctuation effect of refractive index caused by atmospheric turbulence, the coherence of the signal laser is seriously degraded, and the signal light wavefront phase is severely distorted. For high-speed coherent laser communication systems, even if the communication interruption caused by the wavefront phase residual disturbance of a very short time, it will be the loss of thousands of information. In this way, the high sensitivity and high anti-interference ability of spatial coherent laser communication are not reflected, and the availability of the system is extremely low.
AO technology can quickly and accurately correct the wavefront phase distortion caused by atmospheric turbulence and restore the coherence of the signal green laser pointer. The Institute of Optoelectronics introduced AO technology into the atmospheric coherent laser communication system, which overcomes the problem of signal laser beam jitter caused by atmospheric turbulence and the receiving frame, and solves the problem of real-time correction of translational aberrations.
The broken signal spot caused by atmospheric turbulence is restored to an Airy disk close to the diffraction limit, which improves the coupling efficiency of communication light and reduces the scintillation effect of coupled light intensity, and finally establishes a stable coherent laser communication link under moderate atmospheric turbulence conditions road. The research was supported by the National Natural Science Foundation of China, the Chinese Academy of Sciences and other projects.