Device for improving spatially coherent light communication quality based on adaptive optical technology

Abstract

The invention discloses a device for improving spatially coherent light communication quality based on an adaptive optical technology. The device comprises a telescope module, a wavefront corrector, a light slitting element, coherent receiving module, a wavefront detector, a wavefront processor, a digital-to-analog converter and a high-voltage amplifier. According to the device, the influence of atmospheric turbulences is corrected by use of the adaptive optical technology so that a larger-caliber receiving telescope can be applied to a laser communication receiving end without increasing a wavefront error, and therefore, the receiving power can be improved. An adaptive optical system is capable of effectively improving the degree of phase matching of signal laser and local oscillating laser by compensating random dynamic wavefront aberration caused by the atmospheric turbulences and the inherent static wavefront aberration of the system, and therefore, the frequency mixing efficiency is improved, and finally, the purposes of increasing the signal to noise ratio and reducing the bit error rate are achieved.

Description

technical field [0001] The invention relates to a device for improving the quality of spatial coherent optical communication based on adaptive optics (Adaptive Optics, referred to as AO) technology, which can reduce the spatial wavefront of the signal light entering the coherent receiving module through the real-time wavefront correction of the AO system error, thereby improving the communication quality of the spatial coherent optical communication system. Background technique [0002] Compared with traditional microwave communication, space laser communication using laser as an information carrier has high frequency, good spatial and temporal coherence, and narrow transmission beam, so it has high code rate, large communication capacity, small antenna size, low power consumption, and volume The advantages of small size and high confidentiality are effective means to solve the bottleneck of microwave communication, build a space-based broadband network, and realize global h...

AI Technical Summary

Problems solved by technology

Unfortunately, when the laser signal is transmitted in the atmosphere, not only signal attenuation will occur, but also the random fluctuation of the refractive index caused by atmospheric turbulence will lead to random fluctuations in the transmitted laser intensity, phase and transmission direction, and these effects will make the coherence of the transmitted laser Degradation, which seriously reduces the transmission quality of the beam

[0006] There are many ways to suppress the influence of atmospheric turbulence. The existing solutions have their own problems while improving the communication quality: the power of the high-power transmission scheme is limited; the size of the large-aperture reception scheme is limited; the non-coherent multi-aperture The equivalent transmission aperture of the transmission scheme is limited, and it is not suitable for the communication system of coherent modulation

[0009] However, limited by the communication mechanism of incoherent communication itself, the improvement of communication performance by adaptive optics is also limited

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