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Optica Publishing Group
  • Journal of Lightwave Technology
  • Vol. 36,
  • Issue 22,
  • pp. 5244-5253
  • (2018)

Chalcogenide-Glass Nested Anti-Resonant Nodeless Fibers in Mid-Infrared Region

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Abstract

We propose two types of chalcogenide-glass nested anti-resonant nodeless fibers (CNANFs) with four anti-resonant elements, in which a smaller tube is nested. One type of CNANF theoretically achieves ultra-low loss of 2.6 dB/km at the wavelength of 10.6 $\mu$ m and can be used for the delivery of a high-power CO $_2$ laser. The other CNANF is a polarization-maintaining CNANF in the broadband mid-infrared (mid-IR) region. We investigate the tradeoff between loss and birefringence in the mid-IR region and achieve a low loss of $<$ 1 dB/m and high birefringence of $>$ $1\times 10^{-4}$ simultaneously over a large wavelength band by adjusting the air-core size and the thickness of the vertical/horizontal outer tubes. Both CNANFs show strong capability for higher order mode suppression.

© 2018 IEEE

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