Abstract
A tapered fiber with a depressed-index outer ring is fabricated and dispersion engineered to generate a widely tunable fundamental-mode leakage loss with a high cutoff slope and a high attenuation for stop band 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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