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Abstract
With the recent expansion in internet the demand of internet and services offered by internet is rapidly growing. Therefore, with this growth the bandwidth requirement is also growing so it is the major mission of the engineers to meet these high capacity requirements at minimum cost. Optical fibres are proved as best solution to these increasing demands and future network services[1]. They have low weight than the traditional electrical cables and the signal transmitted is in the form of light which is immune to electrical interferences and hence can travel long distances with minimum attenuation.