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1. 发明专利

JP2004091304A Aligning method for optical fiber preform 审中-公开
公开(公告)号：JP2004091304A
公开(公告)日：2004-03-25
申请号：JP2002347358
申请日：2002-11-29
申请人： Furukawa Electric Co Ltd:The , 古河電気工業株式会社
发明人： MORIHIRA HIDEYA , UEHARA MASAMITSU , KAMIYA TAMOTSU , SUZUKI TETSUO , MATSUNAGA KIYOSHI , MIZOGUCHI SATORU
IPC分类号： G02B6/00 , C03B37/012 , C03B37/027
CPC分类号： C03B37/01211
摘要： PROBLEM TO BE SOLVED: To make it possible to easily perform insert work while keeping an appropriate gap. SOLUTION: An aligning method for an optical fiber preform is characterized by providing a taper 32 so that the tip end of a synthetic quartz tube 31 becomes thin and is sealed, further providing a taper 36 so that the tip end part of a core rod 35 becomes thin, and at the same time, providing a spacer 51 so that the synthetic quartz tube 31 and the core rod 35 are concentrically arranged when the optical fiber is manufactured by heating/unifying the tip end part of the optical fiber preform constituted of the core rod 35 and the synthetic quartz tube 31 in whose hollow part the core rod 35 is inserted, and simultaneously performing heating/unifying and drawing while reducing the pressure in the gap between the optical fiber preform and the inserted core rod 35. COPYRIGHT: (C)2004,JPO

2. 发明专利

JP2004043201A Method of working tip of optical fiber preform 审中-公开
公开(公告)号：JP2004043201A
公开(公告)日：2004-02-12
申请号：JP2002199166
申请日：2002-07-08
申请人： Furukawa Electric Co Ltd:The , 古河電気工業株式会社
发明人： MORIHIRA HIDEYA , UEHARA MASAMITSU , KAMIYA TAMOTSU
IPC分类号： G02B6/00 , C03B37/027
CPC分类号： C03B37/02772 , C03B2205/47
摘要： PROBLEM TO BE SOLVED: To prevent that the shape of a welding surface becomes unstable, bubbles are left or a synthetic quartz tube is obliquely welded by well-crushing the synthetic quartz tube and a core rod in the initial stage of heating and melting. SOLUTION: In the manufacture of an optical fiber by heating and integrating the tip part of an optical fiber preform constituted of a core rod and the synthetic quartz pipe into which the core rod is inserted and next, drawing simultaneously with the heating and the integrating while reducing the pressure in gaps between the core rod and the synthetic quartz tube, the method of working the tip of the optical fiber preform is performed by providing a taper in the tip part of the synthetic quartz tube to be narrow and sealing the tip part, also providing a taper in the tip part of the core rod to be narrow and making the slope of the taper provided in the tip part of the core rod to bring the tip part of the core rod into contact with the tip part of the synthetic quartz tube more gentle than that of the taper provided in the tip part of the synthetic quartz tube. COPYRIGHT: (C)2004,JPO

3. 发明专利

JP2004043200A Method of supporting optical fiber preform 审中-公开
公开(公告)号：JP2004043200A
公开(公告)日：2004-02-12
申请号：JP2002199165
申请日：2002-07-08
申请人： Furukawa Electric Co Ltd:The , 古河電気工業株式会社
发明人： MORIHIRA HIDEYA , UEHARA MASAMITSU , KAMIYA TAMOTSU
IPC分类号： G02B6/00 , C03B37/012 , C03B37/027
CPC分类号： C03B37/02736 , C03B37/02754
摘要： PROBLEM TO BE SOLVED: To prevent the disorder of the flow of a gas caused by the rapid fluctuation of furnace pressure at a place where a supporting tube for a clad begins to enter into the furnace in drawing. SOLUTION: In the manufacture of the optical fiber by heating and fusing the tip part of an optical fiber preform constituted of a core rod and a synthetic quartz pipe into which the core rod is inserted and drawing the core rod and the synthetic quartz tube while integrating, the method of supporting the optical fiber preform is performed by inserting the core rod into the synthetic quartz tube provided with a supporting tube having an inside diameter larger than the inside diameter of the synthetic quartz tube in one end. The outside diameter of the supporting tube is equal to or smaller than the outside diameter of the synthetic quartz tube. COPYRIGHT: (C)2004,JPO

4. 发明专利

JP2004043198A Method of cleaning optical fiber preform 有权
标题翻译：清洁光纤预选方法
公开(公告)号：JP2004043198A
公开(公告)日：2004-02-12
申请号：JP2002199163
申请日：2002-07-08
申请人： Furukawa Electric Co Ltd:The , 古河電気工業株式会社
发明人： MORIHIRA HIDEYA , UEHARA MASAMITSU , KAMIYA TAMOTSU
IPC分类号： G02B6/00 , C03B37/014 , C03B37/027
CPC分类号： C03B37/01211 , C03B37/02754
摘要： PROBLEM TO BE SOLVED: To prevent defect from occurring when a quartz tube is formed into an optical fiber in a state that the hollow part of the quartz tube is contaminated by washing and cleaning. SOLUTION: In the manufacture of the optical fiber by heating and melting the tip part of an optical fiber preform constituted of a core rod and the synthetic quartz pipe into which the core rod is inserted and drawing the core rod and the synthetic quartz tube while integrating them, one or more processes for washing the outside surface of the synthetic quartz tube are provided. The method of washing the optical fiber preform is performed by sealing one end of the synthetic quartz tube and after welding a quarts made supporting tube to another end, plugging the quartz made supporting tube and washing. COPYRIGHT: (C)2004,JPO
摘要翻译：要解决的问题：为了防止在石英管的中空部分被洗涤和清洁污染的状态下将石英管形成为光纤时发生缺陷。解决方案：在通过加热和熔化由芯棒和其中插入芯棒的合成石英管构成的光纤预制件的尖端部分来拉制芯棒和合成石英的制造中，同时集成它们，提供用于洗涤合成石英管的外表面的一个或多个工艺。洗涤光纤预制件的方法是通过将合成石英管的一端密封并将石英制成的支撑管焊接到另一端，堵塞石英制的支撑管和冲洗来进行。版权所有（C）2004，JPO

5. 发明专利

JP2003327440A Method for manufacturing preform for optical fiber 审中-公开
标题翻译：用于制造光纤预制件的方法
公开(公告)号：JP2003327440A
公开(公告)日：2003-11-19
申请号：JP2002134697
申请日：2002-05-09
申请人： Furukawa Electric Co Ltd:The , 古河電気工業株式会社
发明人： MORIHIRA HIDEYA , KAMIYA TAMOTSU
IPC分类号： G02B6/00 , C03B37/012
CPC分类号： C03B37/01211 , C03B37/01251 , C03B37/02754 , C03B2205/08 , C03B2205/47
摘要： PROBLEM TO BE SOLVED: To provide a method for manufacturing a preform for an optical fiber, by which the length of defective fiber generated for the time until the spinning operation is stabilized after the start of the spinning operation and the lost time for that time can be shortened when the preform is freshly set on a drawing device and the tip of the preform is melted and drawn so as to be spun into the fiber on the occasion of the manufacturing of the optical fiber. SOLUTION: The method for manufacturing the preform for the optical fiber includes two processes comprising, after forming a glass body having a core, inserting the glass body into a glass tube and unifying them by heating and is characterized in that before heating and unifying, at least one end of the glass tube is ground into a tapered form similar to the meniscus form formed at the time of drawing. COPYRIGHT: (C)2004,JPO
摘要翻译：要解决的问题：提供一种用于制造光纤预制棒的方法，通过该方法，在旋转操作开始之后纺丝操作稳定之前产生的缺陷纤维的长度和用于当将预成型件新鲜地设置在拉丝装置上时，可以缩短该时间，并且在制造光纤的情况下，预成型件的前端被熔化和拉伸以便纺丝成纤维。解决方案：用于制造光纤预制棒的方法包括两种方法，包括：在形成具有芯体的玻璃体之后，将玻璃体插入玻璃管并通过加热使其均匀，其特征在于，在加热和统一，玻璃管的至少一端被研磨成类似于在拉制时形成的弯液面形状的锥形。版权所有（C）2004，JPO

6. 发明专利

JP2003306342A Method for producing glass preform for optical fiber, and glass preform for optical fiber 有权
标题翻译：用于生产用于光纤的玻璃预制件的方法和用于光纤的玻璃预制件
公开(公告)号：JP2003306342A
公开(公告)日：2003-10-28
申请号：JP2002107249
申请日：2002-04-10
申请人： Furukawa Electric Co Ltd:The , 古河電気工業株式会社
发明人： MORIHIRA HIDEYA , KAMIYA TAMOTSU
IPC分类号： G02B6/036 , C03B37/014 , G02B6/22
CPC分类号： C03B37/01453 , C03B2201/31
摘要： PROBLEM TO BE SOLVED: To provide a method for producing a glass preform for an optical fiber that can control bubble formation in the glass preform for an optical fiber having a layer containing fluorine and to produce glass preform for an optical fiber having less bubbles, and the glass preform for an optical fiber. SOLUTION: In the method for producing the glass preform for an optical fiber having a step where a porous body comprising quartz glass powder is vitrified and added with fluorine by heat treatment at a vitrifying point in an atmosphere containing a fluorine compound, the above porous body is vitrified at a vitrifying point of 1,400°C or lower and then heated to a fixed temperature of 1,500°C or more at a rate of 10°C/min or less after reaching the above vitrifying point at the latest in an atmosphere free of the fluorine compound and kept at the temperature for 2 hours or more. COPYRIGHT: (C)2004,JPO
摘要翻译：要解决的问题：提供一种用于制造光纤玻璃预制件的方法，该方法可以控制具有含氟层的光纤的玻璃预制件中的气泡形成，并制造具有较少的光纤的玻璃预制件气泡和用于光纤的玻璃预制件。解决方案：在制造具有以下步骤的光纤的玻璃预制棒的制造方法中，将含有石英玻璃粉末的多孔体玻璃化并在含氟化合物的气氛中的玻璃化点进行热处理而加入氟，上述多孔体在1400℃以下的玻璃化点被玻璃化，最后在达到上述玻璃化点后以10℃/分钟以下的速度加热到1500℃以上的固定温度气氛中不含氟化合物，并保持2小时以上。版权所有（C）2004，JPO

7. 发明专利

JP2004043199A Process for manufacturing optical fiber preform 审中-公开
公开(公告)号：JP2004043199A
公开(公告)日：2004-02-12
申请号：JP2002199164
申请日：2002-07-08
申请人： Furukawa Electric Co Ltd:The , 古河電気工業株式会社
发明人： UEHARA MASAMITSU , MORIHIRA HIDEYA , KAMIYA TAMOTSU
IPC分类号： G02B6/00 , C03B37/012 , C03B37/027
CPC分类号： C03B37/02754
摘要： PROBLEM TO BE SOLVED: To insert a core rod into a clad without grazing it by stabilizing their positions. SOLUTION: In a process for manufacturing an optical fiber, the tip of an optical fiber preform, composed of the core rod and a synthetic quartz tube having a hollow part into which the core rod is inserted, is heat melted and drawn while unifying the core rod and the synthetic quartz tube. Here, the difference between the outer diameter of the core rod and the inner diameter of the synthetic quartz tube is 1.0-10.0 mm. In welding a hanger tube to the tip of the synthetic quartz tube, the tip of the quartz tube and the inner side of the hanger tube are molded so that the difference between the outer diameter of the core rod and the inner diameter of the quartz tube is 1.0-10.0 mm. COPYRIGHT: (C)2004,JPO

8. 发明专利

JP2003021743A Optical fiber and optical transmission system using the same 审中-公开
标题翻译：光纤和光传输系统
公开(公告)号：JP2003021743A
公开(公告)日：2003-01-24
申请号：JP2001207468
申请日：2001-07-09
申请人： Furukawa Electric Co Ltd:The , 古河電気工業株式会社
发明人： KAMIYA TAMOTSU
IPC分类号： G02B6/00 , G02B6/02 , G02B6/036 , H01S3/067 , H01S3/30 , H04B10/07 , H04B10/25 , H04B10/294 , G02B6/22 , H04B10/12 , H04B10/13 , H04B10/135 , H04B10/14
CPC分类号： G02B6/03644 , G02B6/02028 , G02B6/02261 , G02B6/03627 , H01S3/06729 , H01S3/302 , H04B10/2916
摘要： PROBLEM TO BE SOLVED: To provide an optical fiber having an excellent signal to noise ratio and high Raman efficiency in an optical transmission system which uses a Raman amplification and to provide an optical transmission system in which the optical fiber is used.
SOLUTION: The optical transmission system is constituted by using an optical fiber which has a refractive index distribution structure containing one or more annular region between a central core and a clad, and in which Rayleigh scattering coefficient is ≤1 μm
4 .dB/km, the specific refractive index difference with respect to the clad of the central core is a positive value of ≤0.9%, the specific refractive index difference with respect to the clad of the annular region adjacent to the central core is ≥-0.7% and ≤-0.2% and the effective core cross-sectional area is ≤60 μm
2 , and obtain an amplification effect by making the excited wavelength-multiplexed light incident on the optical fiber.
COPYRIGHT: (C)2003,JPO
摘要翻译：要解决的问题：提供一种在使用拉曼放大的光传输系统中具有优异的信噪比和高拉曼效率的光纤，并提供使用光纤的光传输系统。解决方案：光传输系统通过使用具有在中心芯和包层之间包含一个或多个环形区域的折射率分布结构，并且瑞利散射系数<=1μm<4>的光纤构成.dB / km，相对于中心芯的包层的比折射率差为正值<= 0.9％，相对于与中心芯相邻的环形区的包层的比折射率差为> 0.7％，<= -0.2％，有效芯截面积为<=60μm2，通过使激发的波分复用光入射到光纤上而获得放大效果。

9. 发明专利

JPS5978947A Method for depositing optical glass 失效
标题翻译：沉积光学玻璃的方法
公开(公告)号：JPS5978947A
公开(公告)日：1984-05-08
申请号：JP18573382
申请日：1982-10-22
申请人： Furukawa Electric Co Ltd:The
发明人： KAMIYA TAMOTSU , KIKUCHI TAKEYUKI , OGURA KUNIO , FURUI YASUROU
IPC分类号： C03B37/018 , C03B19/14 , C03B37/012 , C03B37/014 , C03C1/00 , C03C3/06 , C03C13/04 , G02B6/00
CPC分类号： C03B37/01413 , C03B37/01291
摘要： PURPOSE:To obtain glass having a desired refractive index for a base material for an optical fiber or the like by decomposing a vapor-phase starting material for glass and a vapor-phase dopant, vitrifying the resulting oxide powder for glass, and spraying it on a surface for depositing glass. CONSTITUTION:A vapor-phase starting material for glass such as SiCl4 and a vapor-phase dopant such as GeCl4 or POCl3 are subjected to thermal decomposition or flame hydrolysis to form oxide powder for glass. The powder is vitrified by a plasma heating method, and it is sprayed and deposited on a surface for depositing glass such as the surface of a quartz rod to obtain glass having a desired refractive index of a base material for an optical fiber, a rod lens or the like.
摘要翻译：目的：通过分解用于玻璃和气相掺杂剂的气相原料来获得用于光纤等的基材的具有期望的折射率的玻璃，将所得的玻璃用氧化物粉末玻璃化，并将其喷雾用于沉积玻璃的表面。构成：将用于玻璃的气相原料如SiCl 4和气相掺杂剂如GeCl 4或POCl 3进行热分解或火焰水解以形成用于玻璃的氧化物粉末。通过等离子体加热方法将粉末玻璃化，并将其喷涂沉积在用于沉积诸如石英棒表面的玻璃的表面上，以获得具有用于光纤的基材的所需折射率的玻璃，棒状透镜或类似物。

10. 发明专利

JPS60196702A Optical fiber cable containing gaseous hydrogen detecting fiber 失效
标题翻译：包含气体检测光纤的光纤电缆
公开(公告)号：JPS60196702A
公开(公告)日：1985-10-05
申请号：JP5387884
申请日：1984-03-21
申请人： Furukawa Electric Co Ltd:The , Nippon Telegr & Teleph Corp
发明人： KAMIYA TAMOTSU , MURAKAMI TAIJI , UESUGI SUNAO
IPC分类号： G01M11/00 , G01M11/02 , G02B6/00 , G02B6/02 , G02B6/44
CPC分类号： G02B6/4494 , G02B6/4492
摘要： PURPOSE:To enable quick detection of the gaseous hydrogen generated in an optical fiber cable by forming said cable of optical fibers for transmission and a gaseous hydrogen detecting optical fiber having a prescribed core compsn. CONSTITUTION:A gaseous hydrogen detecting optical fiber 3 of which the core compsn. is SiO2-GeO2-P2O5 contg. more P2O5 than P2O5 contained in optical fibers 2 around a tensile wire 1 is also provided together with the fibers 2 to an optical fiber cable. The transmission loss by the hydrogen absorbed and diffused in the optical fibers increases at a higher rate with the fiber 3 than with the fibers 2, from which the gaseous hydrogen generated in the optical fiber cable is quickly detected. The easy and sure maintenance and inspection of the optical fiber cable are thus assured.
摘要翻译：目的：通过形成用于透射的光纤电缆和具有规定的核心组成的气态氢气检测光纤，能够快速检测在光纤电缆中产生的气态氢。构成：核心组成的气态氢气检测光纤3。是SiO 2 -GeO 2 -P 2 O 5。与拉伸丝1相邻的光纤2中所含有的P2O5的P2O5比纤维2还与光纤电缆一起设置。在光纤中被吸收和扩散的氢的传输损耗以比光纤2更高的速率与纤维2相比增加，从而从光纤2快速检测出在光纤电缆中产生的气态氢。因此，可以确保光纤电缆的容易且可靠的维护和检查。

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