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    Rare earth element-doped multiple-core optical fiber, method for fabricating the same, and optical amplifier using the same
    141.
    发明授权
    Rare earth element-doped multiple-core optical fiber, method for fabricating the same, and optical amplifier using the same 失效
    稀土元素掺杂多芯光纤，其制造方法以及使用其的光放大器

    公开(公告)号：US5570448A

    公开(公告)日：1996-10-29

    申请号：US476445

    申请日：1995-06-07

    Applicant: Katsuyuki Imoto ,  Kazuo Koya

    Inventor： Katsuyuki Imoto ,  Kazuo Koya

    IPC: G02B6/04 ,  C03B37/012 ,  C03B37/028 ,  G02B6/00 ,  G02B6/02 ,  H01S3/06 ,  H01S3/067 ,  H01S3/07 ,  H01S3/10 ,  H01S3/17

    CPC classification number: C03B37/01222 ,  G02B6/02042 ,  H01S3/06708 ,  C03B2201/10 ,  C03B2201/28 ,  C03B2201/31 ,  C03B2201/36 ,  C03B2203/12 ,  C03B2203/29 ,  C03B2203/34 ,  H01S3/06729 ,  H01S3/06754

    Abstract: At least three elementary optical fibers are covered with a jacket layer. Each of the elementary optical fibers has a core of a first refractive index doped with at least one rare earth element and Al, and a cladding layer of a second refractive index lower than the first refractive index for covering the core. A value of (1+2t/Dw) is ranged to be 1.1 to 2.5, where t is a thickness of the cladding layer, and Dw is an outer diameter of the core, and a doping amount of Al is at least 1 weight %. The at least three elementary optical fibers are inserted into a jacket tube, and the elementary optical fibers and the jacket tube are heated to be welded at contact surfaces thereof by vacuum-drawing air from interstices of the elementary optical fibers and the jacket tube. Thus, a preform is obtained, and the preform is heated to be drawn. Consequently, a rare earth element-doped multiple-core optical fiber is fabricated. The rare earth element-doped multiple-core optical fiber is used to amplify a signal light to be propagated therethrough by receiving an excitation light.

    Abstract translation: 至少三个基本光纤被护套层覆盖。 每个基本光纤具有掺杂有至少一种稀土元素和Al的第一折射率的芯和具有低于用于覆盖芯的第一折射率的第二折射率的包层。 （1 + 2t / Dw）的值为1.1〜2.5，其中t为包层的厚度，Dw为芯的外径，Al的掺杂量为1重量％以上， 。 将至少三个基本光纤插入护套管中，并且通过从基本光纤和护套管的间隙抽真空来加热基本光纤和套管，以在其接触表面处焊接基本光纤和护套。 因此，获得预制件，并将预成型件加热以拉伸。 因此，制造了稀土元素掺杂多芯光纤。 稀土元素掺杂多芯光纤用于通过接收激发光来放大要传播的信号光。

    Method of making multicomponent optical waveguide having index gradient
    143.
    发明授权
    Method of making multicomponent optical waveguide having index gradient 失效
    制造具有折射率梯度的多组分光波导的方法

    公开(公告)号：US4478622A

    公开(公告)日：1984-10-23

    申请号：US130079

    申请日：1980-03-13

    Applicant: Robert Olshansky

    Inventor： Robert Olshansky

    IPC: C03B37/014 ,  G02B6/028 ,  C03C25/02

    CPC classification number: G02B6/0288 ,  C03B37/01413 ,  C03B2201/10 ,  C03B2201/31 ,  C03B2203/22

    Abstract: An optical waveguide for a communication system includes a graded index core formed from at least three glass-forming compounds with a profile having at least two .alpha.-type index profile terms.The core has a refractive index which is n.sub.c at the center of the core and which varies as a function of the radial distance r from the center of the core substantially as: ##EQU1## where .alpha..sub.i is defined by: ##EQU2## .DELTA.=(n.sub.c.sup.2 -n.sub.o.sup.2)/2n.sub.c.sup.2, n.sub.o is the refractive index of said compounds at r=a,N.sub.c =n.sub.c -.lambda.dn.sub.c /d.lambda. where .lambda. is the wavelength of the light source, and the quantities .DELTA..sub.i are parameters which can be varied provided the condition ##EQU3## is satisfied.

    Abstract translation: 用于通信系统的光波导包括由至少三个具有至少两个α型折射率分布项的轮廓的玻璃形成化合物形成的渐变折射率芯。 芯具有在芯的中心处为nc的折射率，并且其作为从芯的中心的径向距离r的函数变化，其大致如下：其中αi由以下定义：ΔIMAGE = （nc2-no2）/ 2nc2，no是所述化合物在r = a，Nc = nc-λdnc/dλ的折射率，其中λ是光源的波长，并且量DELTA i是可以是 条件是条件满足。

    Low loss optical fibers
    147.
    发明授权
    Low loss optical fibers 失效
    低损耗光纤

    公开(公告)号：US4289516A

    公开(公告)日：1981-09-15

    申请号：US81771

    申请日：1979-10-04

    Applicant: David A. Krohn

    Inventor： David A. Krohn

    IPC: C03B37/023 ,  C03B37/027 ,  C03C13/04 ,  C03C25/02

    CPC classification number: C03B37/02754 ,  C03B37/023 ,  C03C13/046 ,  C03B2201/10 ,  C03B2201/30 ,  C03B2201/50 ,  C03B2201/54 ,  C03B2205/14 ,  C03B2205/16

    Abstract: A method is provided for making an optical fiber by melting and cladding a multi-component core glass without adding the contamination that is normally associated with these processes. As an initial step, a pure multi-component glass is melted in a high purity silica crucible. The temperature of the glass in the crucible and the temperature of the orifice thereof are controlled so that a cane of glass is drawn from the bottom of the crucible. This cane of glass is fed into a silica or borosilicate tube which is being drawn into a fiber. This results in an optical fiber in which the multi-component glass forms the core while the tube forms the cladding.

    Abstract translation: 提供了一种通过熔化和包覆多组分芯玻璃来制造光纤的方法，而不增加通常与这些工艺相关的污染物。 作为初始步骤，将纯的多组分玻璃在高纯度二氧化硅坩埚中熔化。 控制坩埚中的玻璃的温度和其孔口的温度，使得从坩埚的底部抽出玻璃棒。 将该甘蔗玻璃送入被吸入纤维中的二氧化硅或硼硅酸盐管中。 这导致了一种光纤，其中多组分玻璃在管形成包层时形成芯。

    Multicomponent optical waveguide having index gradient
    149.
    发明授权
    Multicomponent optical waveguide having index gradient 失效
    具有折射率梯度的多分量光波导

    公开(公告)号：US4222631A

    公开(公告)日：1980-09-16

    申请号：US883214

    申请日：1978-03-03

    Applicant: Robert Olshansky

    Inventor： Robert Olshansky

    IPC: C03B37/018 ,  C03B37/014 ,  G02B20060101 ,  G02B6/028 ,  H01P3/00 ,  H01P3/16 ,  G02B5/14

    CPC classification number: G02B6/0288 ,  C03B37/01413 ,  C03B2201/10 ,  C03B2201/31 ,  C03B2203/22 ,  C03B2207/86

    Abstract: An optical waveguide for a communication system includes a graded index core formed from at least three glass-forming compounds with a profile having at least two .alpha.-type index profile terms.The core has a refractive index which is n.sub.c at the center of the core and which varies as a function of the radial distance r from the center of the core subststantially as: ##EQU1## where .alpha..sub.i is defined by: ##EQU2## where N.gtoreq.2,.DELTA.=(n.sub.c.sup.2 -n.sub.0.sup.2)/2n.sub.c.sup.2,n.sub.o is the refractive index of said compounds at r=a,N.sub.c =n.sub.c -.lambda.dn.sub.c /d.lambda. where .lambda. is the wavelength of the light source, and the quantities .DELTA..sub.i are parameters which can be varied provided the condition ##EQU3## is satisfied.

    Abstract translation: 用于通信系统的光波导包括由至少三个具有至少两个α型折射率分布项的轮廓的玻璃形成化合物形成的渐变折射率芯。 芯具有在芯的中心处为nc的折射率，并且其作为从核心中心的径向距离r的函数变化为：其中αi i由下式定义：其中N> / = 2，DELTA =（nc2-n02）/ 2nc2，no是所述化合物在r = a，Nc = nc-λdnc/dλ的折射率，其中λ是光源的波长，并且量DELTA 我是可以变化的参数，只要满足条件。

    Double crucible method of optical fiber manufacture
    150.
    发明授权
    Double crucible method of optical fiber manufacture 失效
    光纤制造双坩埚法

    公开(公告)号：US4217123A

    公开(公告)日：1980-08-12

    申请号：US926052

    申请日：1978-07-19

    Applicant: James G. Titchmarsh

    Inventor： James G. Titchmarsh

    IPC: C03B37/023 ,  C03B37/085 ,  C03B37/02

    CPC classification number: C03B37/023 ,  C03B37/085 ,  C03B2201/10 ,  C03B2201/50

    Abstract: A method for forming optical fibres from a double crucible wherein one crucible supplies the core material and the other crucible supplies the cladding material. The two melts are supplied in a continuous process to insure a constant core to cladding diameter ratio.

    Abstract translation: 一种用于从双坩埚形成光纤的方法，其中一个坩埚供应芯材料，另一个坩埚供应包层材料。 这两种熔体以连续的方式供应以确保恒定的芯到包层直径比。

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