Patents

A process for making rare earth doped optical fibre

The present invention provides an improved process for making rare earth doped ('reforms and fibres by a combination of MCVD technique and solution doping method, said method comprising developing matched or depressed clad structure 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 AICI3/A1(NO3)3 in definite proportion,controlling the porosity of the soot,dipping period, strength of the solution and the proportion of the codopants to achieve the desired RE ion concentration in the core and minimise the core clad boundary defects and followed by drying, oxidation, dehydration and sintering of the RE containing porous deposit and collapsing at a high temperature to produce the preform and overcladding with silica tubes of suitable dimensions and fibre drawing to produce fibres.

Patent Assignee: Council of Scientific & Industrial Research (CSIR)

Patent No: IN223566 [India]

Application No: 00475/DELNP/2003

Inventor(s): Tarun Bandyopadhyay; Ranjan Sen; Shyamal Kumar Bhadra; Kamal Dasgupta; Mukul Chandra Paul

Issue Date: 10-03-2008

Filing Date: 31-03-2003

Licensing Option: Laboratory willing to jointly develop technology with industrial partner.

Implementing institute: CSIR-Central Glass and Ceramic Research Institute [CSIR-CGCRI]

Funding agency: Council of Scientific and Industrial Research (CSIR)

IPC Classification: C03B 37/018

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