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1. 发明专利

JP2004277245A Method of manufacturing optical fiber preform 审中-公开
公开(公告)号：JP2004277245A
公开(公告)日：2004-10-07
申请号：JP2003073079
申请日：2003-03-18
申请人： Mitsubishi Cable Ind Ltd , 三菱電線工業株式会社
发明人： KIN MASATAKA , TAKANO TSUYOSHI , NISHINA RINTARO
IPC分类号： G02B6/00 , C03B37/012
摘要： PROBLEM TO BE SOLVED: To provide a method of manufacturing optical fiber preform by which the occurrence of crack due to the hitting or the rubbing of a rod material against the inside wall of a pipe in inserting the rod material to a pipe material and the eccentricity of a part to be a core of an optical fiber in the produced optical fiber preform are suppressed. SOLUTION: The method of manufacturing the optical fiber preform is a rod-in-tube method and is provided with a step for forming the rod material R by continuously melt-sticking an upper side dummy rod 26 and a lower side dummy rod 27 respectively to the upper part and the lower part of the quartz core rod 24 and a step for judging whether the bending amount of the rod material R is equal to or below a desired bending amount or not. COPYRIGHT: (C)2005,JPO&NCIPI

2. 发明专利

JP2004043237A Process for manufacturing optical fiber preform, optical fiber preform manufactured thereby and optical fiber 有权
公开(公告)号：JP2004043237A
公开(公告)日：2004-02-12
申请号：JP2002202572
申请日：2002-07-11
申请人： Mitsubishi Cable Ind Ltd , 三菱電線工業株式会社
发明人： ITO HIDEAKI , KIN MASATAKA , HAYASHI TAKAYUKI , TAKANO TSUYOSHI
IPC分类号： G02B6/00 , C03B37/012 , C03C13/04
摘要： PROBLEM TO BE SOLVED: To inexpensively manufacture an optical fiber preform 1 used for manufacturing a single-mode optical fiber with a low loss at a wavelength of 1,385 nm. SOLUTION: The process comprises a glass body-manufacturing step wherein an anhydrous glass body 11' is manufactured, a rod-drawing step wherein the anhydrous glass body 11' is heated and drawn and a unification step wherein an anhydrous glass rod 11 is unified with a glass pipe 12. In the rod-drawing step, the anhydrous glass body 11' is heated in an electric furnace 4 and drawn while subliming and removing its outer surface part. COPYRIGHT: (C)2004,JPO

3. 发明专利

JP2003054974A Method for manufacturing optical fiber preform 审中-公开
标题翻译：制造光纤预制件的方法
公开(公告)号：JP2003054974A
公开(公告)日：2003-02-26
申请号：JP2001251825
申请日：2001-08-22
申请人： Mitsubishi Cable Ind Ltd , 三菱電線工業株式会社
发明人： ITO HIDEAKI , KIN MASATAKA , NAGAE NOBUSADA
IPC分类号： G02B6/00 , C03B37/012
CPC分类号： C03B37/01211 , Y02P40/57
摘要： PROBLEM TO BE SOLVED: To provide a method for manufacturing an optical fiber preform in which the surface of a quartz rod is cleaned and the quartz rod is put in a quartz pipe while keeping the cleaned state. SOLUTION: A quartz rod 2 obtained by drawing a soot sintered compact is inserted in an auxiliary pipe 12 and a quartz pipe 11 while cleaning the surface of the quartz rod 2 by polishing with a flame 21. Flame polishing is gradually carried out from the tip of the quartz rod 2 to be inserted first toward the upper part and the flame-polished part is quickly put in the auxiliary pipe 12 and the quartz pipe 11 as it is. The quartz rod 2 is therefore inserted in the quartz pipe 11 while keeping the cleaned state of the surface and the objective high quality optical fiber preform is obtained.
摘要翻译：要解决的问题：提供一种在保持清洁状态的同时清洁石英棒的表面并将石英棒放入石英管中的光纤预制件的制造方法。解决方案：通过拉制烟灰烧结体获得的石英棒2通过用火焰21进行抛光来清洁石英棒2的表面，同时插入辅助管12和石英管11中。火焰抛光从尖端将石英棒2首先插入上部并且将火焰抛光部分迅速地放入辅助管12和石英管11中。因此，石英棒2被插入石英管11中，同时保持表面的清洁状态并获得目标高质量的光纤预制件。

4. 发明专利

JP2005029441A Manufacturing method of optical fiber preform, optical fiber preform manufactured thereby and optical fiber 有权
标题翻译：光纤预制件的制造方法，制造光纤和光纤的光纤预制件
公开(公告)号：JP2005029441A
公开(公告)日：2005-02-03
申请号：JP2003272152
申请日：2003-07-09
申请人： Mitsubishi Cable Ind Ltd , 三菱電線工業株式会社
发明人： TAKANO TSUYOSHI , KIN MASATAKA , HAYASHI TAKAYUKI
IPC分类号： C03B37/012 , C03C13/04 , G02B6/00
摘要： PROBLEM TO BE SOLVED: To provide a method for manufacturing an optical fiber preform for manufacturing an optical fiber with low loss at a wavelength of 1,385 nm band. SOLUTION: The manufacturing method of the optical fiber preform comprises a production step of a glass body to form an anhydrous glass body 11', a rod drawing step of heating/drawing the anhydrous glass body 11' to form an anhydrous glass rod 11, a drying step of drying an outer periphery of the anhydrous glass rod 11 and an inner periphery of a glass pipe 12 in a state that the anhydrous glass rod 11 is inserted into the glass pipe 12 and an integration step of integrating the anhydrous glass rod 11 together with the glass pipe 12. COPYRIGHT: (C)2005,JPO&NCIPI
摘要翻译：要解决的问题：提供一种用于制造在1,385nm波长波长下具有低损耗的光纤的光纤预制棒的方法。解决方案：光纤预制棒的制造方法包括：玻璃体的制造工序，形成无水玻璃体11'，拉拔无水玻璃体11'的拉拔工序，形成无水玻璃棒 11，在将无水玻璃棒11插入玻璃管12的状态下，干燥无水玻璃棒11的外周和玻璃管12的内周的干燥工序，以及将无水玻璃杆11与玻璃管12一起使用。版权所有（C）2005，JPO＆NCIPI

5. 发明专利

JP2004143016A Method for manufacturing optical fiber preform 审中-公开
公开(公告)号：JP2004143016A
公开(公告)日：2004-05-20
申请号：JP2002312259
申请日：2002-10-28
申请人： Mitsubishi Cable Ind Ltd , 三菱電線工業株式会社
发明人： ITO HIDEAKI , KIN MASATAKA , NAGAE NOBUSADA
IPC分类号： C03B37/012
CPC分类号： C03B37/0124 , Y02P40/57
摘要： PROBLEM TO BE SOLVED: To provide a method for manufacturing an optical fiber preform in which a taper part in the finishing time of drawing is used as an insert starting end by preventing an increase in outside diameter of the drawn rode just before the finishing of drawing in the formation of a large and long sized rod by drawing a primary preform in a rod-in-tube method. SOLUTION: In the formation of long sized rod 2 by heating and drawing a large sized quartz rod material 1, the drawing temperature is decreased and the drawing speed is increased after the quartz rod material 1 is drawn by a length necessary for inserting into a tube to fuse and integrate. As a result, it is prevented from forming an outside diameter increased part at the lower end part of the rod 2. Thus, when the rod 2 is inserted into the tube, it is not caused that the lower end part of the rod 2 is caught by an inlet of the tube to disturb the insertion of rod 2 or brought into contact with the inside surface of the tube to give defects. COPYRIGHT: (C)2004,JPO

6. 发明专利

JP2004131352A Method of manufacturing optical fiber preform 审中-公开
公开(公告)号：JP2004131352A
公开(公告)日：2004-04-30
申请号：JP2002300005
申请日：2002-10-15
申请人： Mitsubishi Cable Ind Ltd , 三菱電線工業株式会社
发明人： TAKANO TSUYOSHI , ITO HIDEAKI , KIN MASATAKA
IPC分类号： C03B37/012
CPC分类号： C03B37/01242 , Y02P40/57
摘要： PROBLEM TO BE SOLVED: To fix the condition of the formation of an optical fiber preform to the utmost even in a material having limited kinds of the dimensions by optimizing the manufacturing condition in the method of manufacturing the preform by a rod-in-tube method. SOLUTION: The method of manufacturing the optical fiber preform obtained by the combination of a clad pipe and a glass rod which are selected to obtain the objective value (objective C/C value) of the ratio of the outside diameter of the clad to the diameter of the core on the basis of a given specification includes a process for recalculating an estimated C/C value or an estimated cut-off wavelength after the feed rate which is the rate of inserting speed of the glass rod and the clad pipe to a furnace is changed when at least one of the estimated C/C value or the estimated cut-off wave length is out of a prescribed range. COPYRIGHT: (C)2004,JPO

7. 发明专利

JP2005148116A Optical fiber 审中-公开
标题翻译：光纤
公开(公告)号：JP2005148116A
公开(公告)日：2005-06-09
申请号：JP2003381002
申请日：2003-11-11
申请人： Mitsubishi Cable Ind Ltd , 三菱電線工業株式会社
发明人： OIZUMI SEIRO , KIN MASATAKA , KAWAGISHI MASANORI , IMAMURA KAZUO , KANEKO TAKASHI
IPC分类号： G02B6/028 , G02B6/18
摘要： PROBLEM TO BE SOLVED: To provide an optical fiber capable of exhibiting superior characteristics (loss characteristic or the like) even if it is bent with a radius of curvature of ≤30 mm. SOLUTION: The optical fiber is provided with a core 2 and a clad 3 in which a refractive index distribution coefficient g is in the range of 1≤g≤3 and in which the refractive index gently varies along the radius direction. The diameter of the core 2 and that of the clad 3 are set at 50 μm and 125 μm respectively. The relative index difference (Δ) between the core 2 and the clad 3 is set at 1.5% COPYRIGHT: (C)2005,JPO&NCIPI
摘要翻译：要解决的问题：即使弯曲曲率半径≤30mm，也能够提供能够表现出优异特性（损耗特性等）的光纤。解决方案：光纤设置有芯2和折射率分布系数g在1≤g≤3的范围内并且折射率沿着半径方向轻微变化的包层3。芯2的直径和包层3的直径分别设定为50μm和125μm。芯2和包层3之间的相对折射率差（Δ）设定为1.5％<Δ<2.3％。为了减小曲率半径并且保持物理强度，使用了具有≥1.3％的筛选失真特性的光纤。版权所有（C）2005，JPO＆NCIPI

8. 发明专利

JP2004189500A Apparatus for manufacturing optical fiber preform 审中-公开
公开(公告)号：JP2004189500A
公开(公告)日：2004-07-08
申请号：JP2002355525
申请日：2002-12-06
申请人： Mitsubishi Cable Ind Ltd , 三菱電線工業株式会社
发明人： KIN MASATAKA , TAKANO TSUYOSHI , TAMURA MASAHIRO
IPC分类号： C03B37/012
CPC分类号： C03B37/01242
摘要： PROBLEM TO BE SOLVED: To provide an apparatus for manufacturing an optical fiber preform, which can objectively detect clearances between a quartz pipe and a core rod.
SOLUTION: The apparatus 10 for manufacturing the optical fiber preform for a rod-in-tube method is equipped with a pipe holding section 12 for holding a quartz pipe 22 so that the axis of the pipe coincides with the vertical direction, a rod holding section 14 for holding a quartz core rod 24 inside the quartz pipe 22 held by the pipe holding section 12 in such a manner that the core rod 24 is located at an interval from the inner wall of the pipe 22, and clearance detection means 40 detecting respective clearances between the quartz core rod 24 and both of the left side and the right side of the quartz pipe 22 for each side view from two or more directions of the clearance detection sections 50 which are provided at prescribed positions in the longitudinal direction of the quartz pipe 22 and the quartz core rod 24, each held by the pipe holding section 12 and the rod holding section 14.
COPYRIGHT: (C)2004,JPO&NCIPI

9. 发明专利

JP2003054973A Method for manufacturing optical fiber preform 有权
标题翻译：制造光纤预制件的方法
公开(公告)号：JP2003054973A
公开(公告)日：2003-02-26
申请号：JP2001251374
申请日：2001-08-22
申请人： Mitsubishi Cable Ind Ltd , 三菱電線工業株式会社
发明人： ITO HIDEAKI , KIN MASATAKA , NAGAE NOBUSADA , FUKUDA AKIHIKO , SHIMONO TOMONORI , MIYASHITA KEIJI
IPC分类号： C03B37/012
CPC分类号： C03B37/0124 , Y02P40/57
摘要： PROBLEM TO BE SOLVED: To manufacture an optical fiber preform 4 with suppressed decentering of a core when the optical fiber preform 4 is manufactured by simultaneously integrating and drawing a glass pipe 1 and a glass rod 2. SOLUTION: The glass rod 2 for a core or for a core and a clad is put in the glass pipe 1 for a clad, the glass pipe 1 is evacuated under heating with a heater 3 and the glass pipe 1 and the glass rod 2 are simultaneously integrated and drawn. At this time, the glass pipe 1 and the glass rod 2 are integrated in a state where tension is applied to the longitudinal direction of the glass rod 2 by making the feed velocity VR of the glass rod 2 lower than the feed velocity VP of the glass pipe 1.
摘要翻译：要解决的问题：通过同时整合和拉制玻璃管1和玻璃棒2制造光纤预制棒4时，制造具有抑制芯的偏心的光纤预制棒4.解决方案：用于芯的玻璃棒2 或者将芯和包层放入用于包层的玻璃管1中，玻璃管1在加热器3的同时被加热抽真空，并且玻璃管1和玻璃棒2同时整合并拉伸。此时，玻璃管1和玻璃棒2通过使玻璃棒2的进给速度VR低于玻璃棒2的进给速度VP而向玻璃棒2的长度方向施加张力的状态一体化玻璃管1。

10. 发明专利

JP2004277246A Apparatus and method of manufacturing optical fiber preform 审中-公开
公开(公告)号：JP2004277246A
公开(公告)日：2004-10-07
申请号：JP2003073080
申请日：2003-03-18
申请人： Mitsubishi Cable Ind Ltd , 三菱電線工業株式会社
发明人： KIN MASATAKA , TAKANO TSUYOSHI , TAMURA MASAHIRO
IPC分类号： G02B6/00 , C03B37/012
摘要： PROBLEM TO BE SOLVED: To provide an apparatus for manufacturing an optical fiber preform in which the axis of a quartz pipe is made to constantly coincide with the axis of a heating furnace. SOLUTION: The optical fiber preform is manufactured by moving a cylindrical quartz pipe 22 and a columnar quartz core rod 24 positioned inside the quartz pipe 22 at a certain interval from the inside wall of the quartz pipe 22 together with each other in the longitudinal direction to successively send them to the cylindrical heating furnace 15 and integrate them by heating and melt-sticking. The deviation of the axis of the quartz pipe 22 from the axis of the heating furnace 15 is detected and compensated to make both the axes coincide with each other by displacing the quartz pipe 22. COPYRIGHT: (C)2005,JPO&NCIPI

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