Abstract
The all-fiber lidar shows exciting prospects in space-borne applications, but the coupling efficiency between the telescope and a single-mode fiber is an important problem in the lidar design. We employ the mode-matching theory to analyze theoretically the coupling efficiency. In practical coupling system design, three position deviations, which are the off-axis deviation, defocus deviation, and angle deviation, exert a substantial influence on the coupling efficiency and must be considered and discussed. Generally it is very difficult for a fiber coupling system based on a single lens to adjust the fiber position deviations and obtain the maximum coupling efficiency. Therefore, a coupling system, based on the GRIN lens combined with the lenses, is designed and employed to decrease the influence of these position deviations. We perform some numerical simulations to verify the feasibility of a coupling system based on the GRIN lens. Our results show that a coupling system based on the GRIN lens can overcome the off-axis deviation and defocus deviation and decrease the adjustment difficulty.
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