Advances in Research of Adaptive Optical (AO) Technology for Spatial Coherent Laser Communication Systems by Key Laboratory of Adaptive Optics, Institute of Optics and Electronics, Chinese Academy of Sciences Achieve 5Gbps High Quality under Medium Atmospheric Turbulence in Laboratory Spatial coherent laser communication effect. It is verified that AO technology can improve the availability of coherent laser communication system and has very high application value in the coherent laser communication system of horizontal atmosphere, star ground and other links.
Coherent laser communication has the advantages of high sensitivity, fast potential communication speed, strong anti-interference ability and high confidentiality. It has huge application requirements and broad market prospects in the fields of large-capacity satellite communications and local broadband data transfer station access and other communications The key technology for realizing the integration of high-speed communications network in the world in the future. Due to the refractive index fluctuation caused by atmospheric turbulence, the coherence of the signal laser is severely degraded, and the phase of the signal light is seriously distorted. For high-speed coherent laser communications systems, even a very short period of wavefront phase residual disturbance caused by communication interruption, will be tens of thousands of information loss. In this way, spatially coherent laser communication with high sensitivity, high anti-interference ability can not be reflected, the availability of the system is very low.
AO technology can quickly and accurately correct the atmospheric wave front wave phase distortion caused by the resumption of the signal laser coherence. Optoelectronics introduced AO technology into atmospheric coherent laser communication system to overcome the problem of signal laser beam jitter caused by atmospheric turbulence and receiving frame, solved the problem of real-time translational aberration correction, restored the broken signal flare caused by atmospheric turbulence to near the diffraction limit The Airy spot improves the coupling efficiency of the communication light and reduces the flickering effect of the coupling light intensity. Finally, a stable coherent laser communication link is established under moderate atmospheric turbulence conditions.
The research has been supported by the National Natural Science Foundation of China, Chinese Academy of Sciences and other projects.
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