OPTICAL FIBER AND METHOD FOR MAKING SUCH FIBER

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According to one example of the invention an optical fiber comprises : (i) silica based, rare earth doped core having a first index of refraction n1; (ii) at least one silica based cladding surrounding the core and having a second index of refraction n2, such that n1> n2; wherein at least one of the core or cladding is doped with Al2O3, such that the ratio of max wt% to min wt% of Al2O3 concentration is less than 2 : 1