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Originally Posted by James Henry
Fibre is affected by temperature? The lasers yes but the fibre itself shouldn't be affected?
Sorry if that's what you meant but I know that copper's conduction is affected by heat but fibre deffo isn't affected by anything bar enough heat to melt the glass.
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There is very little current in coax so conduction not a big issue, but changes in the dielectric and dimensions affect the loss per unit length.
You can make temperature and strain sensors out of fibre optics as dispersion/loss properties do have a temperature dependence. Temperature affects dimensions of cable construction plus temperature cycling has mechanical effect on terminations.
Effects shouldn't be big - but if things are marginal it can push them over the edge.