CHAPTER 41
FIBRE OPTICS
During the last hundred years a series of inventions have enabled telecomunication links to be built with ever-increasing capacity. The early telegraph links carried signals at speeds up to about 30 words per minute, or about 15 bits per second. Some of the fibre-optic cable being installed today in the longdistance trunk networks has the capacity to carry signals at a speed of 2.4 Gbps. The theoretical capacity of these hair-thin glass fibres is tremendous. Much fibre optic cable is being installed today, mainly in the long distance and inter-office networks. Over the next ten years, fibre optical cable will be progressively installed as local loops in some areas. In the meantime, however, a multitude of different ...
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