负双包层锥形有源光纤

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一种负双包层锥形有源光纤，包括有源掺稀土纤芯(1)、凹陷层(2)、内包层(3)及外包层(4)。所述光纤的纤芯、凹陷层、内包层及外包层的折射率分别为n1、n2、n3、n4，且n1>n3>n2，n1>n3>n4；纤芯、凹陷层、内包层及外包层的半径分别为a、b、c、d，且a

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