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    Mode field diameter conversion optical fiber
    1.
    发明授权
    Mode field diameter conversion optical fiber 失效
    模场直径转换光纤

    公开(公告)号：US5446820A

    公开(公告)日：1995-08-29

    申请号：US98908

    申请日：1993-07-29

    申请人： Shinji Ishikawa ,  Hiroo Kanamori ,  Koji Nakazato ,  Masayuki Nishimura ,  Yuichi Ohga

    发明人： Shinji Ishikawa ,  Hiroo Kanamori ,  Koji Nakazato ,  Masayuki Nishimura ,  Yuichi Ohga

    IPC分类号： G02B6/02 ,  G02B6/14 ,  G02B6/255 ,  G02B6/10

    CPC分类号： G02B6/2552

    摘要： An object of this invention is to provide a mode field diameter conversion optical fiber which can be processed in a short period of time to have a reduced mode field diameter at a desired portion thereof. The optical fiber according to this invention comprises a core of silica glass having a residual tensile stress, and a cladding surrounding the core and having a lower refractive index than that of the core. The desired portion is heated to relax the residual tensile stress in the core, whereby the optical fiber has a reduced mode field diameter at the desired portion.

    摘要翻译： 本发明的目的是提供一种可以在短时间内处理以在其期望部分具有减小的模场直径的模场直径转换光纤。 根据本发明的光纤包括具有残余拉伸应力的石英玻璃芯和围绕芯的包层，并且折射率低于芯的折射率。 加热所需部分以松弛芯中的残余拉伸应力，由此光纤在期望部分具有减小的模场直径。

    Process for thermal treatment of glass fiber preform
    2.
    发明授权
    Process for thermal treatment of glass fiber preform 失效
    玻璃纤维预制件热处理工艺

    公开(公告)号：US5306322A

    公开(公告)日：1994-04-26

    申请号：US924767

    申请日：1992-07-24

    申请人： Shinji Ishikawa ,  Yuichi Ohga ,  Ichiro Tsuchiya ,  Hiroo Kanamori ,  Hiroshi Yokota ,  Michihisa Kyoto

    发明人： Shinji Ishikawa ,  Yuichi Ohga ,  Ichiro Tsuchiya ,  Hiroo Kanamori ,  Hiroshi Yokota ,  Michihisa Kyoto

    IPC分类号： G02B6/00 ,  C03B37/014 ,  C03B37/023

    CPC分类号： C03B37/01446 ,  C03B37/0146 ,  C03B2201/07 ,  C03B2201/075 ,  C03B2201/12 ,  Y10S65/16 ,  Y10S65/90

    摘要： The present invention providesa process for the dehydrating and purifying treatment by heating a porous glass preform for an optical fiber comprising passing the porous glass preform through a muffle tube having a SiC layer at least on its inner surface at a high temperature under an atmosphere comprising an inert gas and a silicon halogenide gas;a process for the fluorine-doping treatment by heating a porous glass preform for an optical fiber comprising passing a porous glass preform through a muffle tube having a SiC layer at least on its inner surface at a high temperature under an atmosphere comprising a fluorine compound gas and an inert gas; anda process for the vitrifying treatment by heating a porous glass preform for an optical fiber comprising passing the preform, which has been previously dehydrated and purified, through a muffle tube having a SiC layer at least on its inner surface at a high temperature under an atmosphere gas.

    摘要翻译： 本发明提供了一种通过加热用于光纤的多孔玻璃预制件进行脱水和净化处理的方法，包括使多孔玻璃预制件通过具有SiC层的马弗管至少在其内表面上在高温下在包括 惰性气体和卤化硅气体; 通过加热用于光纤的多孔玻璃预制件进行氟掺杂处理的方法，包括使多孔玻璃预制件通过具有SiC层的马弗管至少在其内表面上在高温下在包含氟化合物气体 和惰性气体; 以及通过加热用于光纤的多孔玻璃预制件进行玻璃化处理的方法，包括使预先脱水和净化的预成型体至少在其内表面上通过具有SiC层的马弗管在高温下 气氛气体。

    Method for producing porous glass preform for optical fiber
    6.
    发明授权
    Method for producing porous glass preform for optical fiber 失效
    光纤多孔玻璃预制棒的制造方法

    公开(公告)号：US5238479A

    公开(公告)日：1993-08-24

    申请号：US984734

    申请日：1992-12-04

    申请人： Yuichi Ohga ,  Toshio Danzuka ,  Hiroo Kanamori ,  Hiroshi Yokota

    发明人： Yuichi Ohga ,  Toshio Danzuka ,  Hiroo Kanamori ,  Hiroshi Yokota

    IPC分类号： C03B37/014

    CPC分类号： C03B37/0142 ,  C03B2201/31 ,  C03B2203/22 ,  C03B2203/26 ,  C03B2207/06 ,  C03B2207/20 ,  C03B2207/24 ,  C03B2207/26 ,  C03B2207/28 ,  C03B2207/50

    摘要： The invention is a method for producing a porous preform for use in the fabrication of an optical fiber at least two burners synthesize glass soot particles, one of which generates a double-layer flame and one of which is used for forming a core part of the preform. The method comprises the steps of supplying SiCl.sub.4 and optionally GeCl.sub.4 to the inner flame of the double-layer flame, and only SiCl.sub.4 to an outer flame of the double-layer flame to flame hydrolyze the supplied compounds and synthesize glass soot particles. Compounds SiCl.sub.4 and GeCl.sub.4 as glass-forming raw materials are supplied to the burner for forming the core part of the preform by depositing the generated glass soot particles on the lower end of a rotating starting member. The generated porous preform comprises a core part containing at least partly GeO.sub.2, and a surface having a low concentration of GeO.sub.2 which reduces cracking or peeling.

    摘要翻译： 本发明是用于制造用于制造光纤的多孔预制棒的方法，至少两个燃烧器合成玻璃烟灰颗粒，其中一个产生双层火焰，其中一个用于形成 预制件。 该方法包括以下步骤：向双层火焰的内部火焰提供SiCl 4和任选的GeCl 4，并且仅将SiCl 4与双层火焰的外部火焰直接火焰水解所提供的化合物并合成玻璃烟灰颗粒。 作为玻璃形成原料的化合物SiCl4和GeCl4通过将生成的玻璃烟灰颗粒沉积在旋转起始构件的下端而供给到用于形成预成型体的芯部的燃烧器。 生成的多孔预制件包括至少部分含有GeO 2的核心部分和具有低浓度GeO 2的表面，其减少开裂或剥离。

    Optical fiber for optical amplifier, optical fiber amplifier and optical fiber laser
    7.
    发明授权
    Optical fiber for optical amplifier, optical fiber amplifier and optical fiber laser 有权
    光放大器光纤，光纤放大器和光纤激光器

    公开(公告)号：US06490078B2

    公开(公告)日：2002-12-03

    申请号：US09809301

    申请日：2001-03-16

    申请人： Tadashi Enomoto ,  Masahiro Takagi ,  Yuichi Ohga ,  Motoki Kakui ,  Shinji Ishikawa ,  Masakazu Shigehara ,  Shinji Endo

    发明人： Tadashi Enomoto ,  Masahiro Takagi ,  Yuichi Ohga ,  Motoki Kakui ,  Shinji Ishikawa ,  Masakazu Shigehara ,  Shinji Endo

    IPC分类号： G02B634

    CPC分类号： H01S3/06708 ,  H01S3/06716 ,  H01S3/06729 ,  H01S3/06754

    摘要： The present invention relates to an OFA having a high signal gain, easily manufactured, having a high mechanical strength, having a small splice loss with respect to other optical fibers, and rarely encountering the occurrence of noise at a signal wavelength. The OFA according to the present invention has a function of amplifying signals propagating therethroug by pumping light supplied thereto, and comprises, at least, a core region, an inner cladding region provided on the periphery of the core region, an outer cladding region provided on the periphery of the inner cladding region, and one or more node coupling gratings. An element for signal amplification is added to at least the core region. The core region has a structure ensuring a core mode with respect to the signals, while the inner cladding region has a structure ensuring a multi-mode with respect to the pumping light. Each of the mode coupling gratings passes core mode signals therethrough, and induces a mode coupling between the inner cladding mode and the core mode with respect to the pumping light.

    摘要翻译： 本发明涉及具有高机械强度，易于制造的具有高信号增益，相对于其它光纤具有小的接合损耗，并且很少遇到在信号波长处的噪声的发生的OFA。 根据本发明的OFA具有通过泵送供给到其上的光来传播传播的信号的功能，并且至少包括芯区域，设置在芯区域周围的内包层区域，设置在芯区域 内包层区域的周边，以及一个或多个节点耦合光栅。 用于信号放大的元件至少加到核心区域。 芯区域具有确保相对于信号的芯模式的结构，而内包层区域具有确保相对于泵浦光的多模式的结构。 每个模式耦合光栅通过芯模信号，并且相对于泵浦光在内包层模式和芯模之间引起模耦合。

    Optical fiber and method of making the same
    8.
    发明授权
    Optical fiber and method of making the same 有权
    光纤及其制作方法

    公开(公告)号：US06400878B1

    公开(公告)日：2002-06-04

    申请号：US09939742

    申请日：2001-08-28

    申请人： Katsuya Nagayama ,  Yuichi Ohga ,  Tatsuhiko Saitoh ,  Shinji Ishikawa ,  Ichiro Tsuchiya ,  Takenori Uchiyama

    发明人： Katsuya Nagayama ,  Yuichi Ohga ,  Tatsuhiko Saitoh ,  Shinji Ishikawa ,  Ichiro Tsuchiya ,  Takenori Uchiyama

    IPC分类号： G02B602

    CPC分类号： G02B6/03627 ,  C03B37/02718 ,  C03B37/029 ,  C03B37/15 ,  C03B2201/12 ,  C03B2201/20 ,  C03B2201/31 ,  C03B2203/22 ,  C03B2205/56 ,  C03C13/04 ,  G02B6/02

    摘要： An optical fiber preform 2 having a viscosity ratio R&eegr;=&eegr;0/&eegr;t of 2.5 or less between the core average viscosity &eegr;0 and the total average viscosity &eegr;t is prepared, and is drawn by a drawing furnace 11 so as to yield an optical fiber 3, which is then heated to a temperature within a predetermined range so as to be annealed by a heating furnace 21 disposed downstream the drawing furnace 11. Here, upon annealing in the heating furnace 21, the fictive temperature Tf within the optical fiber lowers, thereby reducing the Rayleigh scattering loss. At the same time, the viscosity ratio condition of R&eegr;≦2.5 restrains the stress from being concentrated into the core, thereby lowering the occurrence of structural asymmetry loss and the like. Hence, an optical fiber which can reduce the transmission loss caused by the Rayleigh scattering loss and the like as a whole, and a method of making the same can be obtained.

    摘要翻译： 准备在芯平均粘度eta0与总平均粘度etat之间具有2.5或更小的粘度比Reta = eta0 / etat的光纤预制棒2，并由拉丝炉11拉伸以产生光纤3， 然后将其加热到预定范围内的温度，以便通过设置在拉丝炉11下游的加热炉21进行退火。这里，在加热炉21中退火后，光纤内的假想温度Tf降低，从而降低 瑞利散射损失。 同时，Reta <= 2.5的粘度比条件限制了应力集中到芯中，从而降低了结构不对称损失的发生等。 因此，可以获得可以降低由瑞利散射损耗等引起的传输损耗等的整体的光纤及其制造方法。

    Glass body for optical fiber method of selecting the same optical fiber and method of making thereof
    10.
    发明授权
    Glass body for optical fiber method of selecting the same optical fiber and method of making thereof 失效
    用于选择相同光纤的光纤的玻璃体及其制造方法

    公开(公告)号：US5763081A

    公开(公告)日：1998-06-09

    申请号：US738841

    申请日：1996-10-28

    申请人： Yuichi Ohga ,  Shinji Ishikawa ,  Tadashi Enomoto

    发明人： Yuichi Ohga ,  Shinji Ishikawa ,  Tadashi Enomoto

    IPC分类号： G02B6/00 ,  C03B37/027 ,  C03C3/06 ,  C03C13/04 ,  G02B6/02 ,  B32B9/00 ,  B29D11/00

    CPC分类号： C03C13/045 ,  C03B37/027 ,  C03C3/06 ,  G02B6/02 ,  C03B2201/12 ,  C03B2201/31 ,  Y02P40/57 ,  Y10T428/2933 ,  Y10T428/2962 ,  Y10T428/2964

    摘要： A glass body for optical fiber containing GeO.sub.2 --SiO.sub.2 glass in a core portion thereof, in which the GeO.sub.2 --SiO.sub.2 glass has an absorbance at 5.16 eV of at least 1/mm but not higher than 2.5/mm or in which concentration of Ge.sup.2+ contained in the GeO.sub.2 --SiO.sub.2 glass substantially lies within the range of 1.1.times.10.sup.-9 to 2.8.times.10.sup.-9 mol/mm.sup.3 as calculated by the following general equation: A=.epsilon..sub.5.16ev .multidot.C.sub.(Ge2+) .multidot.1 wherein A is absorbance which is expressed by A=-log T (T being transmittance) and normalized per 1 mm of optical path length, C.sub.(Ge2+) is Ge.sup.2+ concentration, .epsilon..sub.5.16ev is absorption coefficient (1/mol/cm), and 1 is optical path length.

    摘要翻译： 在其核心部分中含有GeO 2 -SiO 2玻璃的光纤玻璃体，其中GeO 2 -SiO 2玻璃在5.16eV处的吸光度为至少1 / mm但不高于2.5 / mm或其中含有Ge2 +的浓度 在GeO2-SiO2玻璃中基本上在1.1×10 -9至2.8×10 -9 mol / mm 3的范围内，通过以下通式计算：A =ε5.16evxC（Ge2 +）x1其中A是由A表示的吸光度 = -log T（T为透射率），每1mm光程长度标准化，C（Ge2 +）为Ge2 +浓度，ε为5.16ev为吸收系数（1 / mol / cm），1为光程长度。