A method of selecting wavefront corrector according to wavefront zernike mode

Abstract

The invention discloses a method for selecting a wavefront corrector based on the wavefront Zernike mode, which is specifically implemented in accordance with the following steps: Step 1. After the collimated beam is sent by a signal laser and transmitted through the free space atmosphere, it is placed on the wavefront of the adaptive optics system The sensor detects the distorted wavefront, and generates the distorted wavefront phase; step 2, expand the wavefront phase according to the Zernike coefficient to obtain the piston item, oblique component and higher-order component; the Zernike coefficient of the piston item is 0, which is negligible; solve the oblique component and the independent distortion produced by the high-order component; step 3, judge the influence of the independent distortion of the tilt component and the high-order component on the performance of the optical fiber mixing coherent detection system, and obtain the bit error rate of the heterodyne detection system; step 4, according to the error Select the appropriate wavefront corrector for the code rate.

Description

technical field [0001] The invention belongs to the technical field of wireless laser communication, and relates to a method for selecting a wavefront corrector according to a wavefront Zernike mode. Background technique [0002] Wireless laser communication is a communication method that uses laser as a carrier to transmit through the atmosphere. After long-distance transmission, the optical power of the signal received on the photosensitive surface of the photodetector at the receiving end is very weak, and coherent detection can In this case, the information carried by the signal can be recovered. Fiber-optic mixing coherent detection is limited by the bottleneck of fiber coupling, which will cause wavefront distortion and phase distortion due to atmospheric turbulence, resulting in reduced coupling efficiency and mixing efficiency, which will affect the performance of wireless optical communication systems. [0003] For the wavefront distortion phase, adaptive optics (A...

AI Technical Summary

Problems solved by technology

When the correction range of a single wavefront corrector is exceeded, the correction capability of a single wavefront corrector usually cannot meet the problem of large-scale wavefront distortion and phase of light waves caused by conditions such as strong turbulence, high power output, and large aperture reception, and the wavefront The service life of the calibrator will be shortened when it is working close to full stroke for a long time

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