And a silica-based core having a refractive index n 1 of the first (1) rare earth element doped, double-clad active optical fiber, the refractive index n of the second such that (2) n 1 n 2 surrounds the inner cladding and having an inner cladding of a silica base having a numerical aperture of between 0.15 to 0.5 to and surrounds the core and a 2, the refractive index n 3 (3) 3, and an outer cladding of dense silica-based solid containing a dopant to lower the refractive index and to the n 2 n 3, the outer diameter of the inner cladding is at least 125μm. And preferably preferably in the range of 125~350μm the outer diameter of the inner cladding, is in the range of 145~500μm the outer diameter of the outer cladding. The optical fiber is for use in optical amplifiers and fiber lasers or light sources used in both the high power.
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机译：以及一种二氧化硅基纤芯，其掺杂的第一（1）种稀土元素双包层活性光纤的折射率为n 1 ，第二种折射率为n （ 2） n 1> n 2围绕内包层，并具有数值范围介于0.15至0.5之间的二氧化硅基底的内包层，并围绕芯和 2，折射率n 3 （3）3和密实的二氧化硅基固体的外覆层，其中包含掺杂剂以降低折射率并降低n 2> n 3，内包层的外径至少为125μm。并且优选地，内包层的外径在125〜350μm的范围内，外包层的外径在145〜500μm的范围内。光纤用于光放大器和光纤激光器，或用于高功率的光源。
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