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Updated: Jul 3, 2026

In-situ Tapering of Chalcogenide Fiber for Mid-infrared Supercontinuum Generation
Published on: May 27, 2013
Influence of depressed-index outer ring on evanescent tunneling loss in tapered double-cladding fibers
Nan-Kuang Chen1, Kuei-Chu Hsu, Shien-Kuei Liaw
1Department of Electro-Optical Engineering, National United University, Miaoli 360, Taiwan. nkchen@nuu.edu.tw
Abstract:
A tapered fiber with a depressed-index outer ring is fabricated and dispersion engineered to generate a widely tunable (1250-1650 nm) fundamental-mode leakage loss with a high cutoff slope (-1.2 dB/nm) and a high attenuation for stop band (>50 dB) 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.
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