Dong, L., Archambault, J.L., Russell, P.St.J. and Payne, D.N.
Strong UV absorption in germanosilicate fibre preforms induced by exposure to 248nm radiation
At ECOC '94: 20th European Conference on Optical Communications, Italy.
26 - 30 Sep 1994.
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A new technique has enabled us to resolve the strong UV absorption spectrum in the UV-exposed germanosilicate preforms. Our results show that the strong UV-induced band at 195 nm is responsible for as much as 1 x 10 of index change at 1.5µm after only moderate UV exposure in a 0.18 NA preform. The thermal annealing properties of this band also resemble those of fibre gratings, supporting a colour-centre model of photosensitivity.
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