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    A PROCESS OF MAKING RARE EARTH DOPED OPTICAL FIBRE
    2.
    发明申请
    A PROCESS OF MAKING RARE EARTH DOPED OPTICAL FIBRE 审中-公开
    制造稀土光学光纤的工艺

    公开(公告)号：WO2003033423A1

    公开(公告)日：2003-04-24

    申请号：PCT/IN2001/000184

    申请日：2001-10-18

    Applicant: COUNCIL OF SCIENTIFIC AND INDUSTRIAL RESEARCH ,  BAR-ILAN UNIVERSITY ,  SEN, Ranjan ,  CHATTERJEE, Miss, Minati ,  NASKAR, Milan, Kanti ,  PAL, Mrinmay ,  PAUL, Mukul, Chandra ,  BHADRA, Shyamal, Kumar ,  DASGUPTA, Kamal ,  GANGULI, Dibyendu ,  BANDYOPADHYAY, Tarun ,  GEDANKEN, Aharon

    Inventor： SEN, Ranjan ,  CHATTERJEE, Miss, Minati ,  NASKAR, Milan, Kanti ,  PAL, Mrinmay ,  PAUL, Mukul, Chandra ,  BHADRA, Shyamal, Kumar ,  DASGUPTA, Kamal ,  GANGULI, Dibyendu ,  BANDYOPADHYAY, Tarun ,  GEDANKEN, Aharon

    IPC: C03B37/018

    CPC classification number: C03B37/01838 ,  C03B37/016 ,  C03B2201/02 ,  C03B2201/12 ,  C03B2201/28 ,  C03B2201/31 ,  C03B2201/36 ,  C03C1/02 ,  C03C1/026 ,  Y02P40/57

    Abstract: The present invention discloses a process for making rare earth (RE) doped optical fibre by using RE oxide coated silica nanoparticles as the precursor materia, more particularly the method of the present invention involves preparation of stable dispersions (sol) of RE oxide coated silica nanoparticles at ambient temperature and applying a thin coating on the inner surface of silica glass tube following dip coating technique or any other conventional methods, of the said silica sol containing suitable dopants selected from Ge, Al, P, etc., the coated tubes were further processed into optical preforms by following MCVD technique and fiberised in desired configuration, the novelty lies in eliminating the step of the formation of porous soot layer at high temperature by CVD process inside a fused silica glass tube for formation of the core and also in the elimination of the incorporation of the rare earth ions into the porous soot layer following the solution doping technique or other conventional methods, the direct addition of RE oxides in the sol eliminates the formation of microcrystalites and clusters of rare earth ions and prevents change in composition including variation of RE concentration in the core which results in increase in the reproducibility and reliability of the process to a great extent, further the addition of Ge(OET)4 at ambient temperature in the silica sol reduces the quantity of GeCl4 which is required at high temperature to achieve the desired Numerical Aperture.

    Abstract translation: 本发明公开了一种通过使用RE氧化物涂覆的二氧化硅纳米颗粒作为前体材料制备稀土（RE）掺杂光纤的方法，更具体地说，本发明的方法包括制备RE氧化物涂覆的二氧化硅纳米粒子的稳定分散体（sol） 在环境温度下，在浸渍涂布技术或任何其它常规方法之后，在石英玻璃管的内表面上施加薄涂层，所述硅溶胶含有选自Ge，Al，P等的合适的掺杂剂，所述涂覆的管进一步 通过遵循MCVD技术加工成光学预型件并在所需结构中纤维化，新颖性在于消除了在用于形成芯的熔融石英玻璃管内的CVD工艺在高温下形成多孔烟灰层的步骤，并且还在消除 根据溶液掺杂技术或其他配合将稀土离子掺入多孔烟灰层中 通常的方法中，在溶胶中直接添加RE氧化物消除了微晶体和稀土离子簇的形成，并且防止了组分中的变化，包括核心中RE浓度的变化，这导致过程的再现性和可靠性增加到 在很大程度上，进一步在硅溶胶中在环境温度下添加Ge（OET）4会降低在高温下所需的GeCl 4的量以达到所需的数值孔径。

    A PROCESS FOR MAKING RARE EARTH DOPED OPTICAL FIBRE
    3.
    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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