Abstract

ABSTRACT Using modified chemical vapour deposition ( MCVD ) process and the solution dopingtechnique germania doped single mode fibres with additives of Ce, Pb, Al, Y, Er and Nd in concentration of 1000-2000 ppm either singly or in combination were fabricated in longlengths. The fibres were exposed to gamma radiation from 60Co source at a dose rate of 300-400 rad/min for a total cumulative dose of 8-10 kilo rads at ambient temperature withon-line recording of the induced loss at l300nm. It was observed that the presence of minorquantities of dopants considerably influences the loss characteristics of the fibres recordinghighest radiation sensitivity in Nd doped ones while the codoped fibres with Al+Y, M+Pband Al+Er have close range of sensitivity around O.OldBIKm.Rad. KEYWORDS Optical fibre, single mode, MCVD, preform, solution doping, gamma irradiation, radiationsensitivity, radiation damage. 1. INTRODUCTION Optical fibres exposed to gamma radiation at room temperature show degraded performance

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