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1. 发明专利

JPS605035A MANUFACTURE OF OPTICAL FIBER PREFORM ROD 失效
公开(公告)号：JPS605035A
公开(公告)日：1985-01-11
申请号：JP11038883
申请日：1983-06-20
申请人： SHOWA ELECTRIC WIRE & CABLE CO
发明人： IWAMOTO TOSHIO , GOTOU ISATAKA
IPC分类号： C03B37/018 , C03B37/014 , G02B6/00
摘要： PURPOSE:To facilitate the control of the refractive index distribution in the soot for an optical fiber preform rod, by depositing a soot composed mainly of quartz to the outer circumference of a core glass composed mainly of quartz, and vitrifying the soot in an gaseous atmosphere containing a dopant. CONSTITUTION:The soot 2 composed mainly of quartz (e.g. deposition of SiO2 powder obtained by the oxidation or hydrolysis reaction, etc. of the halide, hydroxide, or organic compound of Si) is deposited to the outer circumference of the core glass 1 composed mainly of quartz, and the obtained preform rod is inserted into a vitrification furnace 4, and vitrified in a gaseous atmosphere containing a dopant (e.g. an atmosphere of an F-containing gas such as CF4, etc.) to obtain an optical fiber preform rod having the glass layer 5. Since the control of the refractive index of the soot formed to the circumference of the core glass is carried out not at the soot-forming stage but at the vitrification stage, the control in the soot-formation stage can be simplified, and the influence of the dissipated dopant in the vitrification stage can be made negligible.

2. 发明专利

JPS60231435A MANUFACTURE OF PREFORM ROD 失效
公开(公告)号：JPS60231435A
公开(公告)日：1985-11-18
申请号：JP8586884
申请日：1984-04-27
申请人： SHOWA ELECTRIC WIRE & CABLE CO
发明人： GOTOU ISATAKA , IWAMOTO TOSHIO
IPC分类号： C03B8/04 , C03B37/014 , G02B6/00
摘要： PURPOSE:To obtain the titled rod having a large occupancy rate of the core part and a large refractive index difference by dissolving and sintering a preform rod material in a gaseous atmosphere contg. a low-refractive index dopant, and vitrifying the material. CONSTITUTION:Soot obtained by hydrolyzing a gaseous glass material in flames is blown against the peripheral surface of a core rod or the leading end of a target, and deposited to form a preform rod material. The rod maretrial is melted and sintered in a gaseous atmosphere contg. a low-refractive index, dopant, and vitrified. The evaporation of the low-refractive index dopant contained in the rod material is prevented by said method, and the preform rod having a large occupancy rate of the core part and refractive index difference can be obtained in a short time.

3. 发明专利

JPS6163543A Quartz-based optical fiber 失效
标题翻译：基于QUARTZ的光纤
公开(公告)号：JPS6163543A
公开(公告)日：1986-04-01
申请号：JP18348384
申请日：1984-09-01
申请人： Showa Electric Wire & Cable Co Ltd
发明人： GOTOU ISATAKA , HAGIWARA SUEO , MUTA KENICHI
IPC分类号： C03C13/04 , G02B6/00 , G02B6/02 , G02B6/036
CPC分类号： C03C13/045
摘要： PURPOSE:To provide a quartz-based optical fiber having broad transmission range and excellent radiation resistance, by doping fluorine to a germanium- doped quartz core. CONSTITUTION:The objective quartz-based optical fiber has a graded index-type fiber structure composed of a quartz core doped with about 10mol% germanium and about 30ppm of fluorine, and a quartz clad doped with about 30ppm of fluorine. The structural defects of germanium caused by irradiation can be compensated with fluorine by the use of the core having the above composition. Furthermore, germanium can be stabilized by fluorine, and the conversion of hydrogen in the fiber to OH group can be suppressed. A quartz-based optical fiber enabling the stable transmission of light for a long period and having high reliability can be produced by this process.
摘要翻译：目的：通过将掺杂氟的锗掺杂石英芯提供具有宽的透射范围和优异的耐辐射性的石英基光纤。构成：目标石英基光纤具有由掺杂有约10mol％锗和约30ppm氟的石英芯组成的渐变折射率型纤维结构，以及掺杂约30ppm氟的石英包层。通过使用具有上述组成的芯可以用氟补偿由辐射引起的锗的结构缺陷。此外，锗可以被氟稳定，并且可以抑制纤维中的氢转化为OH基。通过该方法，可以制造长时间稳定地发光并具有高可靠性的石英系光纤。

4. 发明专利

JPS60231428A METHOD FOR REMOVING STARTING QUARTZ TUBE OF PREFORM ROD 失效
公开(公告)号：JPS60231428A
公开(公告)日：1985-11-18
申请号：JP8586784
申请日：1984-04-27
申请人： SHOWA ELECTRIC WIRE & CABLE CO
发明人： GOTOU ISATAKA , IWAMOTO TOSHIO
IPC分类号： C03B37/012 , C03B37/014 , C03C15/00 , G02B6/00
摘要： PURPOSE:To remove the quartz tube in a short time by placing a preform rod including a starting quartz tube in an SF6 atmosphere and vaporizing the quartz tube by heating. CONSTITUTION:A core rod 3 is inserted into a starting quartz tube 1 provided with a clad layer 2 at the inner peripheral wall surface. The tube 1 and the clad layer 2 are softened and united to a body by heating the outer periphery of the quartz tube 1 to obtain a preform rod. 4. The rod 4 is placed in an SF6 atmosphere and heated to allow the quatz tube 1 to react with SF6. And the quartz tube 1 is vaporized into SiF6 which is discharged from an outlet 5B. According to said process, the starting quartz tube 1 is removed in a short time and further without generating any cracks.

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