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step-index fibre
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Figure 11: The forming of stepped-index optical fibre, using the double-crucible technique. Glass rods containing the core-glass and cladding-glass compositions of the eventual fibre are fed into two concentric platinum crucibles, which are heated in a silica-lined furnace. The two compositions melt under an inert atmosphere and flow through an orifice as a composite, concentric stream, the diameter of which is monitored by a fibre diameter scanner. After passing through primary and secondary polymer coatings and curing ovens (which cure the protective coatings through thermal or ultraviolet energy), the solidified optical fibre is wound around a capstan and onto a take-up reel.
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Figure 11: The forming of stepped-index optical fibre, using the double-crucible...
Encyclopædia Britannica, Inc.