A PROCESS FOR MAKING RARE EARTH DOPED OPTICAL FIBRE

摘要

The present invention provides an improved process for making rare earth dop ed preforms and fibres by a combination of MCVD technique and solution doping method, said method comprising developing matched or depressed clad structur e inside a silica glass substrate tube followed by deposition of unsintered particulate layer containing GeO2 and P2O5 for formation of the core and solution doping by soaking the porous soot layer into an alcoholic/aqueous solution of RE-salts containing co-dopants like AlCl3 / Al(NO3)3 in definite proportion, controlling the porosity of the soot, dipping period, strength o f the solution and the proportion of the codopants to achieve the desired RE i on concentration in the core and minimise the core clad boundary defects and followed by drying, oxidation, dehydration and sintering of the RE containin g porous deposit and collapsing at a high temperature to produce the preform a nd overladding with silica tubes of suitable dimensions and fibre drawing to produce fibres.