TYPES OF OPTICAL FIBRE
It would have been ideal if right from the beginning we could have used fibres made with tiny diameters comparable with the wavelength of the optical signal being used, so that no zigzagging was able to take place, but the manufacture and joining of such high-precision fibres presents considerable difficulty. Today's more common thicker-core fibres are called multimode (because many different modes of transmission are possible). Fibres with very small diameter cores are called monomode (because only a single mode of transmission is possible). There are three basic types of optial fibre:
1. Stepped-index multimode: The basic construction of a stepped-index multimode optical fibre is shown in Fig. 41.5 (a) and its refractive ...
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