Discussion
The following technique is best suited for low cost optical fibers :
Answer: D
The technique best suited for low cost fibers is the double crucible method.
In the double crucible method, molten core glass in an inner crucible and cladding glass in an outer crucible flow out together through concentric nozzles and are drawn directly into fibre. It is a continuous process that works with low-melting multicomponent (soda-lime or borosilicate) glasses and needs no preform, so it is cheap, though the fibres have higher loss.
VAD, OVD and MCVD are vapour deposition methods that build a high-purity silica preform; they give very low-loss telecommunication fibre but at higher cost.
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