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Hydroxyl group formation caused by hydrogen diffusion into optical glass fibre

Hydroxyl group formation caused by hydrogen diffusion into optical glass fibre

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© The Institution of Electrical Engineers
Published

Transmission loss increase of optical glass fibre caused by hydrogen diffusion is measured as a function of temperature and partial pressure of hydrogen gas. The activation energy of hydroxyl group formation from the diffused molecular hydrogen was found to be 15.9 kcal/mole. Also the hydroxyl absorption loss increase at 200°C was found to be proportional to the square root of the partial pressure of hydrogen gas.

Inspec keywords: optical fibres; losses

Other keywords: hydroxyl absorption loss; multimode graded index fibre; transmission loss; optical glass fibre; activation energy; H2 diffusion; partial pressure; hydroxyl group formation

Subjects: Fibre optics; Fibre optics and fibre waveguides

References

    1. 1)
      • Uchida, N.: `Infrared loss increase in silica optical fiber due to chemical reaction of hydrogen', 9th ECOC, October 1983, Geneva, Switzerland, Postdeadline paper.
    2. 2)
      • K.J. Beales , D.M. Cooper , J.D. Rush . Increase attenuation in optical fibres caused by diffusion of molecular hydrogen at room temperature. Electron. Lett. , 917 - 919
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