A method of fabricating rare earth doped optical fibre

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(57) Abstract : The present invention provides a method of fabricating rare earth doped preforms and optical fibres by a combination of modified chemical vapour deposition (MCVD) process and solution doping technique said (MCVD) process is used to develop matched or depressed clad structure inside a silica glass substrate tube followed by deposition of porous silica soot layer containing GeOz, P 2 0 5 or such refractive index modifiers by the backward deposition method for lbrmation of the core and presintering the deposited particulate layer by backward pass with flow of GeC1 4 and/or corresponding dopant halides, soaking the porous soot layer into an alcoholic/aqueous solution of RE-salts containing codopants such as A1C1 3 in definite proportion, drying, oxidation, dehy- ration and sintering of the RE containing porous deposit and by collapsing at a high temperature to produce the preform followed by drawing the fibres by known technique to produce fibres with suitable core-clad dimensions and geometry.