公开(公告)号：US6131414A

公开(公告)日：2000-10-17

申请号：US75877

申请日：1998-05-12

申请人： Yoshiaki Shimizu ,  Tadakatsu Shimada ,  Hideo Hirasawa

发明人： Yoshiaki Shimizu ,  Tadakatsu Shimada ,  Hideo Hirasawa

IPC分类号： C03B37/012 ,  G01N21/41 ,  G01N23/00

CPC分类号： G01N21/412 ,  C03B37/0124

摘要： A method for drawing a mother ingot into a preform for optical fibers comprises providing a mother ingot, subjecting the mother ingot to measurement of a distribution of refractive index along radial directions thereof to determine a ratio of a core diameter to a clad diameter, and comparing the thus determined ratio with a predetermined ratio between the core diameter and the ingot diameter which ensures intended optical transmission characteristics, under which if the determined ratio is insufficient for the intended light transmission characteristics, the mother ingot is further processed until the predetermined ratio is substantially attained, and the resultant ingot is drawn to a preform, or if the determined ratio is acceptable on comparison with the predetermined ratio, the mother ingot is finally drawn.

摘要翻译： 将母锭制成用于光纤的预成型体的方法包括提供母锭，使母锭沿其径向方向测量折射率分布，以确定芯直径与包层直径的比率，并比较 如此确定的比例与芯直径和锭直径之间的预定比率确保了预期的光传输特性，如果所确定的比例对于预期的光透射特性不足，则母锭进一步被加工直到预定比率基本上 得到的，并且将所得的铸锭拉制成预制件，或者如果与预定比例相比确定的比率是可接受的，则母锭最终被拉伸。

公开(公告)号：US5958102A

公开(公告)日：1999-09-28

申请号：US978004

申请日：1997-11-25

申请人： Tadakatsu Shimada ,  Hideo Hirasawa

发明人： Tadakatsu Shimada ,  Hideo Hirasawa

IPC分类号： G02B6/00 ,  C03B37/014 ,  C03B37/018 ,  C03B37/07

CPC分类号： C03B37/0142 ,  C03B37/01466 ,  C03B2207/50 ,  C03B2207/52 ,  C03B2207/70

摘要： A method for making an optical fiber preform comprises depositing fine particles of glass serving as a dad on the surfaces of a rod-shaped core over a given length of the rod-shaped core by use of a plurality of oxyhydrogen flame burner units, detecting an amount of the resultant deposit to check uniformity in the amount of the deposit along the lengthwise direction of the rod-shaped core during the course of the deposition, and further depositing fine particles of glass on any surface portion of the rod-shaped core within the given length from at least one burner unit other than the plurality of burner units to correct the amount of the deposit over the given length based on the results of the detection. The resultant deposit is dehydrated and fired by a usual manner to obtain a preform. An apparatus for carrying out the method is also described.

摘要翻译： 制造光纤预制棒的方法包括：使用多个氢氧焰燃烧器单元，在棒状芯的给定长度上，在杆状芯的表面上沉积用作爸爸的玻璃微粒， 所得沉积物的量用于在沉积过程中检查沿着棒状芯的长度方向的沉积量的均匀性，并且在棒状芯的任何表面部分上进一步沉积微细玻璃颗粒 给定长度从除了多个燃烧器单元之外的至少一个燃烧器单元，以基于检测结果校正给定长度上的沉积量。 将所得到的沉淀物通过常规方式脱水和烧制以获得预成型体。 还描述了用于执行该方法的装置。

公开(公告)号：US5683486A

公开(公告)日：1997-11-04

申请号：US358529

申请日：1994-12-19

申请人： Hiroshi Oyamada ,  Go Ogino ,  Hideo Hirasawa

发明人： Hiroshi Oyamada ,  Go Ogino ,  Hideo Hirasawa

IPC分类号： C03B37/012 ,  C03B37/014 ,  C03B37/027

CPC分类号： C03B37/014 ,  C03B2203/22 ,  C03B2203/36 ,  C03B2207/70 ,  G02B6/02247

摘要： An improvement is proposed, in a method for the preparation of a step-index silica glass preform as a precursor of optical fibers by completing the cladding layer of the secondary preform by the outer deposition on and around a primary preform consisting of the center core and side core, to conduct the outer deposition for the cladding layer in such a way that the inequality .vertline.d.lambda..sub.0 /dk.vertline..ltoreq.500 nm is satisfied, in which k is the ratio of the diameter of the primary preform to the diameter of the secondary preform and .lambda..sub.0 is the zero-dispersion wavelength in nm of an optical fiber obtained by drawing the secondary preform, d.lambda..sub.0 /dk being the differential of a function held between .lambda..sub.0 and k determined beforehand from the distribution of the refractive index within the primary preform. When the outer deposition is performed in this way, a great improvement can be obtained in the uniformity of the zero-dispersion wavelength of the optical fiber prepared by drawing the preform.

摘要翻译： 提出了一种改进方法，其中通过在由中心核心构成的初级预制件上和周围的外部沉积来完成二次预型体的包覆层来制备作为光纤前体的步进折射率石英玻璃预制件的方法，以及 以使得不等式|dλ0 / dk |≤500nm满足下述方式对包覆层进行外部沉积，其中k是初级预制棒的直径与直径的比率 次级预制件和λ0是通过拉制次级预制件获得的光纤的零色散波长（nm），dλ0 / dk是预先从折射率分布预先确定的λ0和k之间保持的函数的差分 初级预制件内的折射率。 当以这种方式进行外部沉积时，通过拉伸预制件制备的光纤的零色散波长的均匀性可以获得很大的改进。

公开(公告)号：US5425795A

公开(公告)日：1995-06-20

申请号：US206522

申请日：1994-03-04

申请人： Hiroyuki Koide ,  Masami Terashima ,  Hideo Hirasawa ,  Kazuhiro Hamaguchi

发明人： Hiroyuki Koide ,  Masami Terashima ,  Hideo Hirasawa ,  Kazuhiro Hamaguchi

IPC分类号： C03B8/04 ,  C03B20/00 ,  C03B37/014 ,  C03B37/018 ,  G02B6/00

CPC分类号： C03B37/01486 ,  Y02P40/57

摘要： An improvement is proposed in the process for the preparation of a porous silica glass preform as a precursor of optical fibers by the VAD method, in which fine silica particles produced by the flame hydrolysis of a silicon-containing compound are deposited on the lower end of a seed rod suspended at the lower end of a suspender rod rotated by a carriage in a vertical tubular reactor furnace to grow in the vertical direction. Instead of taking the fully grown porous preform out of the tubular furnace by pulling up as suspended on the suspender rod as is undertaken in the prior art, the seed rod is temporarily held by clamping with a holding device with disconnection from the suspender rod and the porous preform and seed rod are pulled up by a separate vertical driving device so that the overall height of the apparatus can be greatly decreased contributing to a reduction of the manufacturing cost of optical fibers of silica glass.

摘要翻译： 在通过VAD方法制备作为光纤的前体的多孔石英玻璃预制体的方法中提出了一种改进，其中通过含硅化合物的火焰水解产生的二氧化硅微粒沉积在 悬挂在悬架杆的下端的种子棒，其由垂直管式反应器炉中的托架旋转，以在垂直方向上生长。 代替如现有技术中那样将悬浮在吊杆上的方式将管状炉中的完全生长的多孔预成型件从管状炉中取出，通过夹持装置暂时保持种棒，该保持装置与吊杆断开，并且 通过单独的垂直驱动装置将多孔预成型件和种子杆拉起，从而能够大大降低装置的整体高度，有助于降低石英玻璃的光纤的制造成本。

公开(公告)号：US5366531A

公开(公告)日：1994-11-22

申请号：US131450

申请日：1993-10-04

申请人： Hiroyuki Koide ,  Hitoshi Iinuma ,  Hideo Hirasawa

发明人： Hiroyuki Koide ,  Hitoshi Iinuma ,  Hideo Hirasawa

IPC分类号： C03B37/018 ,  C03B37/014 ,  G02B6/00 ,  C03B37/023

CPC分类号： C03B37/0142 ,  C03B2207/06 ,  C03B2207/20 ,  C03B2207/22 ,  C03B2207/36 ,  Y02P40/57

摘要： An improvement is proposed in the method for the flame hydrolysis of a silicon-containing gas, e.g., silicon tetrachloride, to produce fine silica particles to be deposited on a substrate in a process for the preparation of a silica glass preform of optical fibers by using a fivefold concentric multiplex-tube burner nozzle. In contrast to the conventional way for the flame hydrolysis in which the center or first nozzle opening of the burner serves for ejection of a mixture of silicon tetrachloride and oxygen and hydrogen is ejected from the third nozzle opening while argon is ejected from the second nozzle opening inbetween, the gas ejected from the second nozzle opening is, instead of argon alone, a mixture of oxygen and argon in a specified mixing proportion so that deposition of silica particles on the nozzle end can be prevented even when the feed rate of silicon tetrachloride is relatively high.

摘要翻译： 在用于制备光纤石英玻璃预制棒的方法中，在含硅气体例如四氯化硅的火焰水解方法中提出了一种改进方法，以制备沉积在基材上的细二氧化硅颗粒 一个五重同心多重管燃烧器喷嘴。 与用于火焰水解的常规方法相比，其中燃烧器的中心或第一喷嘴开口用于喷射四氯化硅和氧气的混合物，并且从第三喷嘴开口喷射氢气，同时从第二喷嘴开口喷出氩气 在其间，从第二喷嘴开口排出的气体是以指定的混合比例代替仅含氩和氩的混合物，从而即使当四氯化硅的进料速率为 比较高

公开(公告)号：US07752869B2

公开(公告)日：2010-07-13

申请号：US11133193

申请日：2005-05-20

申请人： Tetsuya Otosaka ,  Dai Inoue ,  Hiroshi Oyamada ,  Jun Abe ,  Hideo Hirasawa

发明人： Tetsuya Otosaka ,  Dai Inoue ,  Hiroshi Oyamada ,  Jun Abe ,  Hideo Hirasawa

IPC分类号： C03B37/018

CPC分类号： C03C13/045 ,  C03B37/01211 ,  C03B37/01291 ,  C03B37/01446 ,  C03B2201/12 ,  C03B2201/20 ,  C03B2201/28 ,  C03B2201/31 ,  C03B2203/22 ,  C03B2203/23 ,  G02B6/03694 ,  Y02P40/57

摘要： A method for manufacturing a preform having a core and a multilayer clad, includes covering a circumference of a rod including at least the core and an inner clad layer with a first tube including at least a high viscosity clad layer, and unifying the rod and the first tube by heating and contracting the first tube.

摘要翻译： 一种制造具有芯和多层包层的预成型体的方法，包括至少包括所述芯和内包层的至少包括高粘度覆层的第一管覆盖至少包含芯的圆周的周边，并将所述棒和 第一管通过加热和收缩第一管。

公开(公告)号：US20050229639A1

公开(公告)日：2005-10-20

申请号：US11133193

申请日：2005-05-20

申请人： Tetsuya Otosaka ,  Dai Inoue ,  Hiroshi Oyamada ,  Jun Abe ,  Hideo Hirasawa

发明人： Tetsuya Otosaka ,  Dai Inoue ,  Hiroshi Oyamada ,  Jun Abe ,  Hideo Hirasawa

IPC分类号： G02B6/00 ,  C03B37/012 ,  C03B37/014 ,  C03B37/018 ,  C03C13/04 ,  G02B6/02 ,  C03B37/075

CPC分类号： C03C13/045 ,  C03B37/01211 ,  C03B37/01291 ,  C03B37/01446 ,  C03B2201/12 ,  C03B2201/20 ,  C03B2201/28 ,  C03B2201/31 ,  C03B2203/22 ,  C03B2203/23 ,  G02B6/03694 ,  Y02P40/57

摘要： Even if an optical fiber obtained by drawing a preform is exposed to hydrogen atmosphere, an OH peak in the optical fiber at wavelength of about 1385 nm hardly rises regardless of the condition of drawing.

摘要翻译： 即使通过拉伸预成型体获得的光纤暴露于氢气氛中，波长约1385nm的光纤中的OH峰也不会随着拉伸条件而上升。

公开(公告)号：US6145344A

公开(公告)日：2000-11-14

申请号：US284902

申请日：1994-08-02

申请人： Hiroshi Oyamada ,  Hiroyuki Koide ,  Goh Ogino ,  Hideo Hirasawa

发明人： Hiroshi Oyamada ,  Hiroyuki Koide ,  Goh Ogino ,  Hideo Hirasawa

IPC分类号： C03B37/018 ,  C03B37/014 ,  G02B6/00 ,  G02B6/036

CPC分类号： G02B6/03633 ,  C03B37/0142 ,  G02B6/02042 ,  C03B2203/22 ,  C03B2203/34 ,  C03B2207/06 ,  C03B2207/50 ,  C03B2207/60 ,  C03B2207/64 ,  C03B2207/66 ,  G02B6/0281 ,  G02B6/0286

摘要： Proposed is an improvement in the VAD process for the preparation of a porous silica glass preform for double-core optical fibers by using three oxyhydrogen flame burners installed one above the other in a flame hydrolysis chamber in which a porous silica glass body consisting of the center core portion formed by the lowermost burner, side core portion formed by the middle burner and the cladding layer formed by the uppermost burner is gradually pulled up as it grows under rotation. Different from conventional procedures in which the extension of the nozzle axis of each of the burners intersects with the rotation axis of the growing body, the extension of the nozzle axis of the middle burner for the side core is displaced in a horizontal direction by a limited distance not to intersect nor to be in parallel with the rotation axis in the invention. By this means, an improvement is obtained in the uniformity of distribution of the refractive index in the side core which otherwise is remarkably disordered.

摘要翻译： 提出了通过在火焰水解室中使用三个氢氧焰燃烧器一起制备用于双芯光纤的多孔石英玻璃预制件的VAD方法的改进，其中由中心组成的多孔石英玻璃体 由最下面的燃烧器形成的芯部，由中间燃烧器形成的侧芯部和由最上面的燃烧器形成的包覆层随着其旋转而逐渐上升。 与常规方法不同，其中每个燃烧器的喷嘴轴线的延伸与生长体的旋转轴线相交，用于侧芯的中间燃烧器的喷嘴轴线的延伸在水平方向上被限制 在本发明中不相交或不与旋转轴平行的距离。 通过这种方式，在侧核中折射率分布的均匀性得到改善，否则其显着无序。

公开(公告)号：US5423898A

公开(公告)日：1995-06-13

申请号：US207541

申请日：1994-03-07

申请人： Masami Terashima ,  Hiroyuki Koide ,  Hideo Hirasawa ,  Kazuhiro Hamaguchi

发明人： Masami Terashima ,  Hiroyuki Koide ,  Hideo Hirasawa ,  Kazuhiro Hamaguchi

IPC分类号： C03B8/00 ,  C03B8/04 ,  C03B20/00 ,  C03B37/014 ,  G02B6/00 ,  C03B37/018

CPC分类号： C03B37/01446 ,  C03B37/01486 ,  Y02P40/57

摘要： An improvement is proposed in the apparatus and method for the preparation of a transparent silica glass preform as a precursor of optical fibers by sintering and vitrifying a porous silica glass preform in a sintering furnace as vertically suspended at the lower end of a suspender rod rotated by a carriage. Different from the conventional process in which the porous preform is lowered into the sintering furnace and the transparent preform after vitrification is pulled up out of the furnace as suspended at the lower end of the suspender rod throughout, a separate vertical driving device is provided along with a horizontal driving device for the carriage so that the effective up-and-down stroke of the carriage can be greatly reduced and the apparatus as a whole can be by far more compact contributing to the reduction of the manufacturing costs of the optical fibers of silica glass.

摘要翻译： 在用于制备作为光纤前体的透明石英玻璃预制件的设备和方法中，提出了一种改进，该方法是将烧结炉中的多孔石英玻璃预制件在垂直悬挂在悬挂杆旋转的下端 一个马车 与将多孔预成型体下降到烧结炉中的常规方法不同，玻璃化后的透明预成型件全部被悬挂在吊杆的下端被拉出炉外，分开设置垂直驱动装置 用于滑架的水平驱动装置，使得能够大大减少滑架的有效上下冲程，整个装置可以更加紧凑，有助于降低二氧化硅光纤的制造成本 玻璃。