Abstract

Thermal refraction focusing in very-large-core step-index antiguided fibers is investigated theoretically. An analytical model based on a zero-field approximation is presented for treating the combined effects of index-antiguiding and thermal focusing for both the linearly polarized fundamental and first-high-order radial modes. At low pumping power, the modes are antiguided by the amplifying core boundary whereas at high pumping power they narrow due to thermal focusing. The same analysis is also applicable for very-large-core graded-index fibers in which the fields are truncated at the boundary.

© 2013 Optical Society of America

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