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Spatial filtering of higher-order modes in multimode fibers
Spatial filtering of higher-order modes in multimode fibers
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机译:多模光纤中高阶模的空间滤波
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摘要
A mode filter for eliminating the propagation of higher-order modes along a section of optical multimode fiber comprises a gr aded in dex (GRIN) lens, preferably of a quarter-pitch length, and a pinhole element in the form of a small core fiber. This configuration creates a Fourier spatial filter assembly that removes higher order modes propagating along an optical fiber while capturing the fundamental mode of the optical signal. A section of GRIN fiber is preferably used as the lens, with the small core fiber disposed at the output of the GRIN fiber lens to collect substantially only the on-axis fundamental mode of the optical signal. Since the higher order modes are shifted away from the origin by the GRIN fiber lens, only the fundamental mode signal is captured by the small core fiber.
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