Abstract

A tapered fiber with a depressed-index outer ring is fabricated and dispersion engineered to generate a widely tunable (12501650nm) fundamental-mode leakage loss with a high cutoff slope (1.2dBnm) and a high attenuation for stop band (>50dB) by modification of both waveguide and material dispersions. The higher cutoff slope is achieved with a larger cross angle between the two refractive index dispersion curves of the tapered fiber and surrounding optical liquids through the use of depressed-index outer ring structures in double-cladding fibers.

© 2008 Optical Society of America

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