Abstract
In this study, Zernike polynomials and optical fiber field theory are applied to build a mathematical model of coupling efficiency (CE) and spatial mode of aberrations. The theory built in this paper can be used to quickly calculate the CE affected by a single aberration as well as the aberrations caused by atmospheric turbulence. The aberrations are classified based on Zernike polynomials and the effects of aberrations on CE of different types and different spatial frequencies are analyzed. The influence of the effects of AO system residual errors is also analyzed. Adaptive optics (AO) equipment is applied to build a system on which the proposed theory was tested; the experimental results validate the theoretical analysis.
Highlights
Atmospheric laser transmission and detection (ALTD) technology, such as gas sensing lidar (GSL)and free space optical communication (FSOC), has become a very popular topic in the laser application technology field [1,2,3,4,5,6,7,8,9,10,11,12]
Is small and only the fundamental mode transmission is allowed in the single-mode fiber (SMF), so the process of the plane wave coupling into the SMF through the focusing lens can be considered the filtering effect of the spatial filter with a radius of ω0 placed at the focus on the optical field EO
Equations (6)–(8) show that the coupling efficiency (CE) of SMF depends on the matching between the incident beam wavefront and the SMF mode-field
Summary
Atmospheric laser transmission and detection (ALTD) technology, such as gas sensing lidar (GSL)and free space optical communication (FSOC), has become a very popular topic in the laser application technology field [1,2,3,4,5,6,7,8,9,10,11,12]. To apply the optical fiber devices, the received light beam must be coupled into a single-mode fiber (SMF) firstly before further signal processing. To couple the received laser beam into a SMF and obtain the maximum signal-to-noise ratio, it is necessary to maximize the coupling efficiency (CE) [4,22,23,24,25,26,27,28]. To this effect, CE has crucial significance in terms of ALTD system performance. SMF coupling technology is the key to an effective ALTD system
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