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Fabrication and characterization of Yb 3 + -doped gain-guided index-antiguided fiber with D-shaped inner cladding

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Abstract

Yb3+doped gain-guided index-antiguided fibers based on phosphate glasses are drawn using the rod-in-tube technique. These fibers have a circular core with 200μm diameter and a D-shaped inner cladding with a 630/480μm diameter for the longer/shorter axis. The negative index profile is present in these fibers, in which the core index of refraction is 0.019% lower than that of the inner cladding. Moreover, their laser amplifier characteristics are experimentally demonstrated, and the method of further improvement in laser performance is suggested.

© 2011 Optical Society of America

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