Optical fibre carries information as light through a glass or plastic core. Single-mode and multimode fibres use different optics, distances and installation constraints, while connectors, splices, cleanliness and bend radius affect the complete link. Fibre can provide high bandwidth and electrical isolation, but the word fibre alone does not guarantee speed, redundancy or a particular service level. Design should define route, strand count, connector type, optical budget, transceivers, growth, physical protection and ownership. Installation records and labels must match both ends. Validation includes inspection, loss measurement and, when required, trace testing against the chosen specification. A link light only confirms that some signal is received; it does not prove margin, correct polarity, expected capacity or resilience to a path failure.
IT glossary
Optical fibre
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