Optical fibres. Reliability. Power law theory1 Scope This technical report is a guideline that gives formulae to estimate the reliability of fibre under a constant service stress based on a power law for crack growth. NOTE Power law is derived empirically, but there are other laws which have a more physical basis (for example, the exponential law). All these laws generally fit short term experimental data well but lead to different long term predictions. The power law has been selected as a most

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The following subjects are within the scope of this document:

— managers of the product and system development process

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