Analysis of an efficient single-mode fiber coupler for all-fiber rotational Raman lidar

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• 作者：Shichun Li ; Dengxin Hua ; ^{dengxinhua@xaut.edu.cn} ; Li Wang ; Yuehui Song
• 关键词：Rotational Raman lidar ; Single-mode fiber coupler ; Graded-index lens
• 刊名：Optik - International Journal for Light and Electron Optics
• 出版年：2013
• 出版时间：July, 2013
• 年：2013
• 卷：124
• 期：13
• 页码：1450-1454
• 全文大小：1464 K

文摘

Consider comprehensively alignment errors and the central obstacle, an expression of coupling efficiency based on free-space optical coupling is derived, then the influence of these factors on coupling efficiency is numerically evaluated. An efficient single-mode fiber coupler with a graded-index lens is tailor-made and optimized for Raman lidar using optical software. Simulation results show that this optimized coupling scheme may make the coupling efficiency to increase by 44.5 % for Gaussian beam than without a graded-index lens if lidar returning signals parallel to optical axial is only considered, and that the multi-core fiber may redouble the optical energy coupled into all-fiber spectroscope.