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介绍了两种对光纤端面进行修饰以扩大模场直径(MFD)的方法(加热扩散法和熔接透镜光纤法)。利用刀片远场扫描法对单模光纤(SMF)、加热扩芯光纤(TECF)与熔接透镜光纤(GIF)这两种修饰后的高斯分布光纤进行了测量比较,验证了其模场直径分别为10.700μm,13.129μm和12.717μm。并针对实际问题作出修正,通过对单模光纤以及上述两种扩束透镜光纤的分析,得到了相当合理的结果。说明这两种端面修饰法确实能起到扩大模场直径同时又不破坏模式分布的作用。并且验证了修正后的刀片法用于测量修饰后的光纤的各参量是非常有利的。
Two methods to modify the fiber end face to expand the mode field diameter (MFD) are introduced (heating diffusion method and fusion lens fiber method). The modified Gaussian distribution optical fiber with single-mode fiber (SMF), heated core-fiber (TECF) and fused lens fiber (GIF) was measured and compared by blade far-field scanning method. 10.700 μm, 13.129 μm and 12.717 μm. And to correct the actual problems, through the single-mode optical fiber and the above-mentioned two kinds of expander lens fiber analysis, has been quite reasonable results. These two kinds of end-face modification method can really play the role of expanding the mode field diameter without damaging the mode distribution. And verified that the modified blade method is very useful for measuring the parameters of the modified optical fiber.