Low-OH-absorption fluoride glass infra-red optical fibres |
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Authors: | Mazé G. Cardin V. Poulain M. |
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Affiliation: | Le Verre Fluoré, Vern-sur-Seiche, France; |
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Abstract: | Ultralow losses of 10?2 to 10?3 dB/km have been predicted in fluoride glass optical fibres between 2 and 4.5 ?m. At 2.9 ?m, 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 ?m 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. |
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