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    A METHOD OF FABRICATING RARE EARTH DOPED OPTICAL FIBRE
    4.
    发明专利
    A METHOD OF FABRICATING RARE EARTH DOPED OPTICAL FIBRE 未知

    公开(公告)号：CA2481204C

    公开(公告)日：2011-02-15

    申请号：CA2481204

    申请日：2002-03-28

    Applicant: MINISTRY OF INFORMATION TECHNOLOGY ,  COUNCIL SCIENT IND RES

    Inventor： SEN RANJAN ,  PAL MRINMAY ,  PAUL MUKUL CHANDRA ,  BHADRA SHYAMAL KUMAR ,  CHATTERJEE SOMESH ,  DASGUPTA KAMAL

    IPC: C03B37/018

    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 GeO2, P2O5 or such refractive index modifiers by the backward deposition method for formation of the core and presintering the deposited particulate layer by backward pass with flow of GeCl4 and/or corresponding dopant halides, soaking the porous soot layer into an alcoholic/aqueous solution of RE-salts containing codopants such as AlCl3 in definite proportion, drying, oxidation, dehydration 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.

    A METHOD OF FABRICATING RARE EARTH DOPED OPTICAL FIBRE
    5.
    发明申请
    A METHOD OF FABRICATING RARE EARTH DOPED OPTICAL FIBRE 审中-公开
    一种制备稀土类光纤光纤的方法

    公开(公告)号：WO2003082756A1

    公开(公告)日：2003-10-09

    申请号：PCT/IN2002/000089

    申请日：2002-03-28

    Applicant: MINISTRY OF INFORMATION TECHNOLOGY ,  COUNCIL OF SCIENTIFIC AND INDUSTRIAL RESEARCH ,  SEN, Ranjan ,  PAL, Mrinmay ,  PAUL, Mukul, Chandra ,  BHADRA, Shyamal, Kumar ,  CHATTERJEE, Somesh ,  DASGUPTA, Kamal

    Inventor： SEN, Ranjan ,  PAL, Mrinmay ,  PAUL, Mukul, Chandra ,  BHADRA, Shyamal, Kumar ,  CHATTERJEE, Somesh ,  DASGUPTA, Kamal

    IPC: C03B37/018

    CPC classification number: C03B37/01807 ,  C03B37/01838 ,  C03B37/01853 ,  C03B2201/12 ,  C03B2201/28 ,  C03B2201/31 ,  C03B2201/36

    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 GeO 2 , P 2 O 5 or such refractive index modifiers by the backward deposition method for formation of the core and presintering the deposited particulate layer by backward pass with flow of GeCl 4 and/or corresponding dopant halides, soaking the porous soot layer into an alcoholic/aqueous solution of RE-salts containing codopants such as AlCl 3 in definite proportion, drying, oxidation, dehydration 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.

    Abstract translation: 本发明提供了通过改进的化学气相沉积（MCVD）工艺和溶液掺杂技术的组合制造稀土掺杂的预制件和光纤的方法，所述（MCVD）工艺用于在石英玻璃基板内部开发匹配或凹陷的包层结构 然后通过用于形成芯的反向沉积方法沉积含有GeO> 2 <，> 25 <或>这些折射率改性剂的多孔二氧化硅烟灰层，并通过GeCl> 4的流动反向预烧结沉积的颗粒层， 和/或相应的掺杂剂卤化物，将多孔烟灰层浸泡成含有共混物的RE盐的醇/水溶液，例如AlCl 3，一定比例的干燥，氧化，脱水和烧结含RE多孔沉积物，并通过塌陷 在高温下生产预成型件，然后通过已知技术拉伸纤维，以生产具有合适的芯包层尺寸和地层的纤维 metry。

    A PROCESS FOR MAKING RARE EARTH DOPED OPTICAL FIBRE
    6.
    发明申请
    A PROCESS FOR MAKING RARE EARTH DOPED OPTICAL FIBRE 审中-公开
    制造稀土接地光纤的工艺

    公开(公告)号：WO2002060830A1

    公开(公告)日：2002-08-08

    申请号：PCT/IN2001/000014

    申请日：2001-02-02

    Applicant: MINISTRY OF INFORMATION TECHNOLOGY ,  COUNCIL OF SCIENTIFIC AND INDUSTRIAL RESEARCH ,  BANDYOPADHYAY, Tarun ,  SEN, Ranjan ,  BHADRA, Shyamal, Kumar ,  DASGUPTA, Kamal ,  PAUL, Mukul, Chandra

    Inventor： BANDYOPADHYAY, Tarun ,  SEN, Ranjan ,  BHADRA, Shyamal, Kumar ,  DASGUPTA, Kamal ,  PAUL, Mukul, Chandra

    IPC: C03B37/018

    CPC classification number: C03B37/01838 ,  C03B37/01807 ,  C03B37/01853 ,  C03B2201/12 ,  C03B2201/28 ,  C03B2201/31 ,  C03B2201/34 ,  C03B2201/36 ,  Y02P40/57

    Abstract: The present invention provides an improved process for making rare earth doped preforms 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 GeO 2 and P 2 O 5 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 AlCl 3 / Al(NO 3 ) 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 overladding with silica tubes of suitable dimensions and fibre drawing to produce fibres.

    Abstract translation: 本发明提供了一种通过MCVD技术和溶液掺杂方法的组合制备稀土掺杂预成型件和纤维的改进方法，所述方法包括在石英玻璃基板管内形成匹配或凹陷的包层结构，随后沉积含GeO的未烧结颗粒层 通过将多孔烟灰层浸泡到含有共掺杂剂如AlCl 3的Al盐/水溶液中，形成芯和溶液掺杂2＆lt; 2＆gt; 2＆lt; 5＆gt; 3 <3>一定比例，控制烟灰的孔隙率，浸渍时间，溶液强度和共混物的比例，以达到芯中所需的RE离子浓度，并使芯包层边界缺陷最小化，随后 干燥，氧化，脱水和烧结含RE多孔沉积物并在高温下塌陷以制备预成型件，并与适当尺寸的硅胶管和纤维拉伸 g生产纤维。

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