公开(公告)号：US20050066690A1

公开(公告)日：2005-03-31

申请号：US10951812

申请日：2004-09-29

申请人： Taiichiro Yamashita ,  Toru Adachi ,  Kazuya Kuwahara ,  Hiroki Shimoda

发明人： Taiichiro Yamashita ,  Toru Adachi ,  Kazuya Kuwahara ,  Hiroki Shimoda

IPC分类号： C03B37/02 ,  C03B37/012 ,  C03B37/029 ,  G02B6/00 ,  C03B37/07

CPC分类号： C03B37/02754 ,  C03B37/029 ,  C03B2205/08 ,  C03B2205/14 ,  C03B2205/64 ,  C03B2205/74

摘要： A method produces an optical fiber without requiring a vertically large space, and an apparatus implements the method. The method produces an optical fiber by heating a lower-end portion of an optical fiber preform with a heating element so that the optical fiber preform can be drawn. In this method, the optical fiber preform is drawn by moving a heat-generating portion of the heating element from the lower-end portion toward an upper-end portion of the optical fiber preform. The apparatus produces an optical fiber by heating a lower-end portion of an optical fiber preform with a heating element so that the optical fiber preform can be drawn. The apparatus comprises a mechanism for moving a heat-generating portion of the heating element from the lower-end portion toward an upper-end portion of the optical fiber preform.

摘要翻译： 一种方法产生光纤而不需要垂直的大空间，并且设备实现该方法。 该方法通过用加热元件加热光纤预成型件的下端部分来制造光纤，使得可以拉制光纤预制件。 在该方法中，通过将加热元件的发热部分从光纤预制棒的下端部向上端部移动来拉伸光纤预制棒。 该装置通过用加热元件加热光纤预制件的下端部分来制造光纤，使得可以拉制光纤预制件。 该装置包括用于将加热元件的发热部分从光纤预制件的下端部向上端部移动的机构。

公开(公告)号：US08346041B2

公开(公告)日：2013-01-01

申请号：US13371835

申请日：2012-02-13

申请人： Eisuke Sasaoka ,  Kazuya Kuwahara

发明人： Eisuke Sasaoka ,  Kazuya Kuwahara

IPC分类号： G02B6/00 ,  H04B10/12

CPC分类号： G02B6/02019 ,  G02B6/0365 ,  H04B10/2916

摘要： The present invention relates to an optical communications system that allows improving OSNR while suppressing the power increase of pumping light for distributed Raman amplification. In the optical communications system, an optical fiber is laid in a transmission section between a transmitter station (or repeater station) and a receiver station (or repeater station), and optical signals are transmitted from the transmitter station to the receiver station via the optical fiber. In the optical communications system, pumping light for Raman amplification, outputted by a pumping light source provided in the receiver station, is fed into the optical fiber via an optical coupler, and the optical signals are distributed-Raman-amplified in the optical fiber. The transmission loss and the effective area of the optical fiber satisfy, at the wavelength of 1550 nm, a predetermined relationship.

摘要翻译： 本发明涉及一种允许改善OSNR同时抑制用于分布式拉曼放大的泵浦光功率增加的光通信系统。 在光通信系统中，光纤被放置在发射台（或中继站）和接收站（或中继站）之间的传输部分中，并且光信号经由光信号从发射台发射到接收站 纤维。 在光通信系统中，由接收站中提供的泵浦光源输出的用于拉曼放大的泵浦光通过光耦合器馈送到光纤中，并且光信号在光纤中被分布拉曼放大。 光纤的传输损耗和有效面积在1550nm的波长下满足预定的关系。

公开(公告)号：US20130064513A1

公开(公告)日：2013-03-14

申请号：US13593743

申请日：2012-08-24

申请人： Takuji NAGASHIMA ,  Toshiki Taru ,  Kazuya Kuwahara

发明人： Takuji NAGASHIMA ,  Toshiki Taru ,  Kazuya Kuwahara

IPC分类号： G02B6/02

CPC分类号： G02B6/02366

摘要： An optical fiber has a plurality of holes in a cladding around a core, and has a high failure strength and small transmission loss. The core is made of glass. The cladding surrounds the core, and the holes are formed in the cladding so as to extend along a central axis of the fiber. The holes are formed with constant intervals therebetween along a circle centered on the core, and each hole has a substantially circular cross section. The cladding is sectioned into two claddings. A residual stress in an inner region that is inside a circumcircle of the holes is a compressive stress.

摘要翻译： 光纤在芯周围的包层中具有多个孔，并且具有高的故障强度和较小的传输损耗。 核心由玻璃制成。 包层围绕芯部，并且在包层中形成孔，以沿着纤维的中心轴线延伸。 这些孔沿着以芯为中心的圆形以恒定的间隔形成，并且每个孔具有基本圆形的横截面。 包层被分成两个包层。 在孔的外接圆内的内部区域的残余应力是压缩应力。

公开(公告)号：US20060138271A1

公开(公告)日：2006-06-29

申请号：US10544217

申请日：2004-04-19

申请人： Takashi Yamazaki ,  Kazuya Kuwahara

发明人： Takashi Yamazaki ,  Kazuya Kuwahara

IPC分类号： B65H57/00

CPC分类号： B65H67/052 ,  B65H54/72 ,  B65H2701/32

摘要： It is an object of the present invention to provide an apparatus and method for winding a wire which are simple in structure and in which spring of the wire out of an annular guide is prevented by accommodating a cut terminal portion of the wire in the annular guide which is disposed movably toward one end of a take-up bobbin. The annular guide (20b) is disposed so that it is capable of covering one of the collars of the take-up bobbin (3) for the wire. The annular guide (20b) has a notch (24) for guiding the wire and an inner peripheral surface (25) having an inner diameter gradually increasing in a direction remote away from the bobbin. The annular guide (20b) may be formed in the shape so that it has an engagement portion (26) for preventing the spring of the wire out of the bobbin. The annular guide (20b) is disposed on the collar (3a) so that it is movable in an axial direction of the bobbin, or the annular guide (20b) may comprise a plurality of portions, which are moved to form the annular guide on the collar (3a).

摘要翻译： 本发明的目的是提供一种绕线的装置和方法，其结构简单，并且通过将线的切割端子部分容纳在环形引导件中来防止电线从环形引导件中脱出的弹簧 其被设置为可移动地朝向卷绕筒管的一端。 环形引导件（20b）被布置成能够覆盖用于导线的卷取线轴（3）的一个环。 环形引导件（20b）具有用于引导线的切口（24）和内径在远离线轴的方向上逐渐增加的内圆周表面（25）。 环形引导件（20b）可以形成为具有用于防止线材的弹簧脱离线轴的接合部分（26）的形状。 环形引导件（20b）设置在轴环（3a）上，使得其能够沿着线轴的轴向移动，或者环形引导件（20b）可以包括多个部分，这些部分被移动以形成 在环（3a）上的环形引导件。

公开(公告)号：US06530243B1

公开(公告)日：2003-03-11

申请号：US09659831

申请日：2000-09-11

申请人： Kazuya Kuwahara ,  Ichiro Tsuchiya ,  Yasuhiro Naganuma

发明人： Kazuya Kuwahara ,  Ichiro Tsuchiya ,  Yasuhiro Naganuma

IPC分类号： C03B37027

CPC分类号： C03B37/027 ,  C03B37/032 ,  C03B2205/40 ,  C03C25/12 ,  Y02P40/57

摘要： A method of drawing an optical fiber which can improve the efficiency in manufacture without deforming resin coatings is provided. The method of drawing an optical fiber in accordance with the present invention is a method in which an optical fiber yielding an outside diameter of 300 to 600 &mgr;m after a resin coating is formed is drawn at a drawing speed of at least 50 m/min, wherein the optical fiber is drawn in a state where the pass line length zp from the outlet of curing furnace to the entrance part of capstan satisfies the following expression (1): z p ≥ - ρ ⁢   ⁢ C p _ · d 2 4 · d 2 2 - d 1 2 A · V f · ln ⁡ [ ( T g - 10 ) - T o T s - T o ] ( 1 ) where Tg is the glass transition temperature of the coating resin [° C.]; TS is the fiber temperature [=TF(0)] at z=0 [° C.]; TO is the room temperature [° C.]; {overscore (&rgr;Cp)} is the average heat capacity of glass and resin [J/(cm3·° C.)]; d1 is the radius before coating [cm]; d2 is the radius after coating [cm]; A is a given constant within the range of 1.5×10−6 to 4.5×10−6 [J/(sec·° C.)]; and Vf is the drawing speed [cm/sec].

摘要翻译： 提供一种拉伸光纤的方法，其可以在不使树脂涂层变形的情况下提高制造效率。 根据本发明的拉伸光纤的方法是在形成树脂涂层后产生300-600μm的外径的光纤以至少50m / min的拉伸速度被拉伸， 其中在从固化炉的出口到主导轴的入口部分的通过线路长度zp满足以下表达式（1）的情况下拉制光纤：其中T g是涂层树脂的玻璃化转变温度[℃] ; TS是z = 0 [℃]时的纤维温度[= TF（0）]; TO是室温[℃]; {overscore（rhoCp是玻璃和树脂的平均热容量[J / （cm 3·℃）]; d1是涂布前的半径[cm]; d2是涂布后的半径[cm]; A是在1.5×10 -6至4.5×10 -6 [J / （sec。°C）]; vf是拉伸速度[cm / sec]。

公开(公告)号：US20120236295A1

公开(公告)日：2012-09-20

申请号：US13417555

申请日：2012-03-12

申请人： Tetsuya Nakanishi ,  Toshiki Taru ,  Takuji Nagashima ,  Tatsuya Konishi ,  Kazuya Kuwahara ,  Makoto Ichikawa

发明人： Tetsuya Nakanishi ,  Toshiki Taru ,  Takuji Nagashima ,  Tatsuya Konishi ,  Kazuya Kuwahara ,  Makoto Ichikawa

IPC分类号： G01N21/59

CPC分类号： G01M11/088

摘要： A method of measuring the bending performance of an optical fiber in a simple manner is provided. Power P1 of light emitted from one end of the optical fiber when light is incident onto the other end of the optical fiber is measured under conditions where the optical fiber 1 is wound at a constant pitch by one layer on the circumferential side of a mandrel 2 and the overall circumference of the optical fiber 1 thus wound is covered with an index matching sheet 5. The refractive index of the index matching sheet 5 substantially matches with the refractive index of resin of the outermost layer of the optical fiber 1.

摘要翻译： 提供了一种以简单的方式测量光纤的弯曲性能的方法。 在光纤入射到光纤的另一端时从光纤的一端发射的光的功率P1是在光纤1在心轴2的周向侧以恒定的间距缠绕一层的条件下测量的 并且用折射率匹配片5覆盖如此卷绕的光纤1的整体周长。折射率匹配片5的折射率与光纤1的最外层的树脂的折射率基本一致。

公开(公告)号：US06735983B1

公开(公告)日：2004-05-18

申请号：US09830939

申请日：2001-05-03

申请人： Toshiki Taru ,  Ichiro Tsuchiya ,  Katsuyuki Tsuneishi ,  Katsuya Nagayama ,  Kazuya Kuwahara

发明人： Toshiki Taru ,  Ichiro Tsuchiya ,  Katsuyuki Tsuneishi ,  Katsuya Nagayama ,  Kazuya Kuwahara

IPC分类号： C03B3702

CPC分类号： C03B37/0253 ,  C03B37/02736 ,  C03B37/029 ,  C03B2205/63 ,  C03B2205/70 ,  C03B2205/72 ,  C03B2205/80

摘要： A fiber drawing method according to the present invention is a drawing method of optical fiber for drawing an optical fiber 14 from one end of a fiber preform 13 by softening with heat, wherein the fiber preform 13 is set in a semi-closed space 10, 20 opening in part at a lower end in a fiber drawing furnace, the fiber preform 13 is heated by a heater 15 disposed on the lower end side of this semi-closed space 10, 20, and fiber drawing is carried out with adjusting a quantity of heat dissipation from the upper portion 20 of this semi-closed space.

摘要翻译： 根据本发明的纤维拉伸方法是通过用热软化从纤维预成型体13的一端拉伸光纤14的光纤的拉丝方法，其中纤维预制棒13设置在半封闭空间10中， 20在纤维拉伸炉的下端部分地开口，纤维预成型体13被设置在该半封闭空间10,20的下端侧的加热器15加热，并且通过调节量进行纤维拉伸 从该半封闭空间的上部20散热。

公开(公告)号：US08145024B2

公开(公告)日：2012-03-27

申请号：US12850669

申请日：2010-08-05

申请人： Eisuke Sasaoka ,  Kazuya Kuwahara

发明人： Eisuke Sasaoka ,  Kazuya Kuwahara

IPC分类号： G02B6/00 ,  H04B10/04 ,  H04B10/06

CPC分类号： G02B6/02019 ,  G02B6/0365 ,  H04B10/2916

摘要： The present invention relates to an optical communications system that allows improving OSNR while suppressing the power increase of pumping light for distributed Raman amplification. In the optical communications system, an optical fiber is laid in a transmission section between a transmitter station (or repeater station) and a receiver station (or repeater station), and optical signals are transmitted from the transmitter station to the receiver station via the optical fiber. In the optical communications system, pumping light for Raman amplification, outputted by a pumping light source provided in the receiver station, is fed into the optical fiber via an optical coupler, and the optical signals are distributed-Raman-amplified in the optical fiber. The transmission loss and the effective area of the optical fiber satisfy, at the wavelength of 1550 nm, a predetermined relationship.

摘要翻译： 本发明涉及一种允许改善OSNR同时抑制用于分布式拉曼放大的泵浦光功率增加的光通信系统。 在光通信系统中，光纤被放置在发射台（或中继站）和接收站（或中继站）之间的传输部分中，并且光信号经由光信号从发射台发射到接收站 纤维。 在光通信系统中，由接收站中提供的泵浦光源输出的用于拉曼放大的泵浦光通过光耦合器馈送到光纤中，并且光信号在光纤中被分布拉曼放大。 光纤的传输损耗和有效面积在1550nm的波长下满足预定的关系。

公开(公告)号：US06907757B2

公开(公告)日：2005-06-21

申请号：US10078269

申请日：2002-02-20

申请人： Kazuya Kuwahara ,  Katsuya Nagayama ,  Ichiro Tsuchiya ,  Masashi Onishi

发明人： Kazuya Kuwahara ,  Katsuya Nagayama ,  Ichiro Tsuchiya ,  Masashi Onishi

IPC分类号： G02B6/00 ,  C03B37/027 ,  C03B37/029 ,  C03B37/07 ,  C03B37/02

CPC分类号： C03B37/029 ,  C03B2205/63 ,  Y02P40/57

摘要： The drawing method of the present invention uses a drawing furnace comprising a furnace muffle tube, a furnace body and a heater. According to the method, an optical fiber preform is inserted from the inlet of the furnace muffle tube, the optical fiber preform is melted by means of a heater, under a specified gas atmosphere, and is drawn toward the outlet of the furnace muffle tube by means of a specified drawing tension. The optical fiber preform and the drawing furnace used in this method both satisfy the condition of below-indicated formula (1): L/D≧8  (1) wherein L indicates the length of the furnace body in the drawing direction and D indicates the diameter of the optical fiber preform. Through this method, even for the case of drawing optical fibers having a large relative index difference between the central core and the cladding, optical fibers wherein residual amounts of lattice defects are sufficiently reduced and degradation of characteristics under a hydrogen atmosphere is sufficiently suppressed can be obtained efficiently and at low cost.

摘要翻译： 本发明的拉拔方法使用包括炉马弗管，炉体和加热器的拉丝炉。 根据该方法，从炉马弗管的入口插入光纤预制棒，在特定的气体气氛下，通过加热器将光纤预制棒熔化，并通过炉管马弗管的出口向炉马弗管的出口拉出 指定图纸张力的手段。 本方法中使用的光纤预制棒和拉丝炉均满足下述式（1）的条件：<？in-line-formula description =“In-line formula”end =“lead”？> L / D > = 8（1）<？in-line-formula description =“In-line Formulas”end =“tail”？>其中L表示炉体在拉伸方向上的长度，D表示光纤的直径 预制件。 通过这种方法，即使在中心纤芯和包层之间绘制相对折射率差大的光纤的情况下，也可充分地抑制晶格缺陷残留量的充分降低，氢气氛下的特性劣化得到充分抑制的光纤， 有效地以低成本获得。

公开(公告)号：US06853784B2

公开(公告)日：2005-02-08

申请号：US09983297

申请日：2001-10-23

申请人： Makoto Shimizu ,  Yuji Kubo ,  Kazuya Kuwahara

发明人： Makoto Shimizu ,  Yuji Kubo ,  Kazuya Kuwahara

IPC分类号： G02B6/036 ,  C03B37/012 ,  C03B37/014 ,  C03C25/00 ,  C03C25/60 ,  G02B6/00 ,  H04J14/02

CPC分类号： G02B6/02242 ,  C03B37/01228 ,  C03B37/01446 ,  C03B37/01466 ,  C03B2203/29 ,  C03B2203/36 ,  C03C25/00 ,  C03C25/607 ,  G02B6/02009 ,  G02B6/03633

摘要： The present invention relates to an optical fiber comprising a structure enabling WDM transmissions by utilizing the whole wavelength range of 1300 nm to 1625 nm as a signal wavelength band. In the optical fiber according to the present invention, the transmission loss is 0.4 dB/km or less at a wavelength of 1310 nm, 0.4 dB/km or less at a wavelength of 1383 nm, and 0.3 dB/km or less at a wavelength of 1550 nm. The chromatic dispersion is 0.1 ps/nm/km or more but 5.5 ps/nm/km or less at a wavelength of 1383 nm, and 0.1 ps/nm/km or more but 16.5 ps/nm/km or less in the wavelength range of 1530 nm to 1565 nm. The cut off wavelength at a length of 22 m is 1300 nm or less, and the absolute value of dispersion slope in the wavelength range of 1300 nm to 1625 nm is 0.1 ps/nm2/km or less.

摘要翻译： 本发明涉及一种包括通过利用1300nm至1625nm的整个波长范围进行WDM传输的结构作为信号波长带的光纤。 在本发明的光纤中，波长1310nm，波长1383nm为0.4dB / km以下，波长为0.3dB / km以下时的传输损失为0.4dB / km以下 为1550nm。 在1383nm的波长下，色散为0.1ps / nm / km以上，5.5ps / nm / km以下，波长范围为0.1ps / nm / km以上16.5ps / nm / km以下 为1530nm至1565nm。 长度为22μm的截止波长为1300nm以下，在1300nm〜1625nm的波长范围内的色散斜率的绝对值为0.1ps / nm 2 / km以下。