Reduction of absorption losses in ZrF4-based IR fibres |
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| Authors: | France P.W. Carter S.F. Moore M.W. Williams J.R. |
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| Affiliation: | British Telecom Research Laboratories, Ipswich, UK; |
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| Abstract: | By incorporating oxidising gases into the melt atmosphere during the fabrication of ZrF4-based IR fibres, it has been possible to reduce absorption due to Fe2+ to extremely low levels. This was accompanied by an increase in loss from Cu2+, but this absorption tails off rapidly beyond 1.5 ?m. Overall absorption losses have been reduced to the order of 2 dB/km at 2.5 ?m, estimated to have arisen from other 3d transition metals and some rare earths. |
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