Low-OH-absorption fluoride glass infra-red optical fibres
- 11 October 1984
- journal article
- Published by Institution of Engineering and Technology (IET) in Electronics Letters
- Vol. 20 (21) , 884-885
- https://doi.org/10.1049/el:19840600
Abstract
Ultralow losses of 10−2 to 10−3 dB/km have been predicted in fluoride glass optical fibres between 2 and 4.5 μm. At 2.9 μm, in the central part of this spectral region, the OH− ion presents its fundamental stretching vibration which gives rise to a strong and broad absorption. The attenuation at 2.9 μm in a step-index fluorozirconate glass fibre has been brought down to 58 dB/km, by reducing the OH− concentration in the glass. It is the lowest attenuation yet reported at this wavelength in any optical fibre.Keywords
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