Wavelength-dependent optical loss increase in GeO2-P2O5-doped graded-index optical fibre transmission lines has been observed. The loss increase is found to depend strongly on the P2O5 concentration. By reducing the P2O5 concentration, loss increases at 1.3 μm can be suppressed to a sufficient extent without any hindrance for practical usage.
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Tanifuji et al. (1984) studied this question.
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