Mode field diameter measurement - variable aperture method in the farfield 模场直径测量.远场可变孔径法
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Chromatic dispersion measurement of multimode graded - index and single - mode optical fibers by spectral group delay measurement - variable aperture method in the farfield 利用光谱组延迟测量法进行多模渐变折射率光纤和单模光纤的色散测量.远场可变孔径法