Answers are grounded in this paper and cite their sources.
Ultimately low OH content optical fibres with 1.2% refractive-index difference and 80 μm core diameter have been successfully obtained by dehydrating a v.a.d.-made porous preform under optimised conditions. The loss increase at 1.39 μm due to residual OH ions was only 0.04 dB/km. Accordingly, the measured attenuation curve can be resolved into contribution from the intrinsic loss mechanism with the additional low waveguide imperfection loss.
No takes yet. Share an insight, caveat, or question.
Moriyama et al. (1980) studied this question.
Synapse has enriched 10 related papers. Consider them for comparative context: