公开(公告)号：US20040181939A1

公开(公告)日：2004-09-23

申请号：US10764454

申请日：2004-01-27

申请人： SUMITOMO ELECTRIC INDUSTRIES, LTD.

发明人： Tatsuhiko Saitoh ,  Shinji Ishikawa

IPC分类号： G02B006/04

CPC分类号： C03B37/01228 ,  C03B37/027 ,  C03B37/02718 ,  C03B2203/14 ,  C03B2203/42 ,  C03B2205/56 ,  G02B6/02347 ,  G02B6/02361 ,  Y10T29/49162 ,  Y10T29/49194

摘要： The present invention provides a method of producing an optical fiber having a decreased transmission loss and air holes extending in the axial direction of the fiber. The method of the present invention includes a first step of preparing an optical fiber preform having through holes for forming the air holes, a second step of drawing the optical fiber preform in a drawing furnace to form an optical fiber having the air holes, and a third step of heating the optical fiber at a temperature in the range of 900null C. to 1300null C. in an additional heating furnace provided downstream of the drawing furnace.

摘要翻译： 本发明提供一种具有降低的传输损耗的光纤的制造方法和沿着纤维的轴向延伸的气孔。 本发明的方法包括制备具有用于形成气孔的通孔的光纤预制件的第一步骤，在拉丝炉中拉制光纤预制件以形成具有气孔的光纤的第二步骤，以及 在设置在拉丝炉下游的附加加热炉中，在900℃至1300℃的温度范围内加热光纤的第三步骤。

公开(公告)号：US20020078715A1

公开(公告)日：2002-06-27

申请号：US10035330

申请日：2002-01-04

申请人： Sumitomo Electric Industries, Ltd.

发明人： Tomohiro Ishihara ,  Tatsuhiko Saitoh ,  Yuichi Ohga

IPC分类号： C03B037/029

CPC分类号： C03B37/027 ,  C03B37/02772 ,  C03B37/029 ,  C03B2205/45 ,  C03B2205/47 ,  C03B2205/63 ,  C03B2205/72

摘要： A drawing apparatus 1 has a drawing furnace 11 for heating and drawing an optical fiber preform 2, and a carbon heater 13 is disposed in this drawing furnace 11. The carbon heater 13 has a heating portion the length of which in a drawing direction is set to not less than 280 mm. The carbon heater 13 heats the preform so that a maximum temperature on the surface of the optical fiber preform 2 in the drawing furnace 11 becomes below 1800null C. The optical fiber preform 2 is drawn in a state in which the temperature of the muffle tube 12 of the drawing furnace 11 is kept below 1800null C., so that atomic arrangement in the optical fiber preform 2 becomes relatively aligned in a state of reduced randomness of atomic arrangement. This permits the optical fiber 3 to be drawn as reflecting the reduced randomness state of atomic arrangement, whereby the optical fiber 3 can be obtained with reduced Rayleigh scattering intensity and lowered transmission loss.

摘要翻译： 拉伸装置1具有用于加热和拉伸光纤预制棒2的拉丝炉11，并且在该拉拔炉11中设置碳加热器13.碳加热器13具有设置在拉伸方向上的长度的加热部分 至不小于280毫米。 碳加热器13加热预制件，使得拉丝炉11中的光纤预制棒2的表面上的最高温度变得低于1800℃。将光纤预制棒2拉制成马弗管的温度 拉丝炉11的12被保持在1800℃以下，使得光纤预制棒2中的原子排列在原子排列的随机性降低的状态下变得相对对准。 这允许光纤3被拉伸以反映原子排列的随机性降低的状态，从而可以获得具有降低的瑞利散射强度和降低的传输损耗的光纤3。

公开(公告)号：US20020044753A1

公开(公告)日：2002-04-18

申请号：US09939742

申请日：2001-08-28

申请人： Sumitomo Electric Industries, Ltd.

发明人： Katsuya Nagayama ,  Yuichi Ohga ,  Tatsuhiko Saitoh ,  Shinji Ishikawa ,  Ichiro Tsuchiya ,  Takenori Uchiyama

IPC分类号： G02B006/16 ,  G02B006/22

CPC分类号： G02B6/03627 ,  C03B37/02718 ,  C03B37/029 ,  C03B37/15 ,  C03B2201/12 ,  C03B2201/20 ,  C03B2201/31 ,  C03B2203/22 ,  C03B2205/56 ,  C03C13/04 ,  G02B6/02

摘要： An optical fiber preform 2 having a viscosity ratio Rnullnullnull0/nullt of 2.5 or less between the core average viscosity null0 and the total average viscosity nullt is prepared, and is drawn by a drawing furnace 11 so as to yield an optical fiber 3, which is then heated to a temperature within a predetermined range so as to be annealed by a heating furnace 21 disposed downstream the drawing furnace 11. Here, upon annealing in the heating furnace 21, the fictive temperature Tf within the optical fiber lowers, thereby reducing the Rayleigh scattering loss. At the same time, the viscosity ratio condition of Rnullnull2.5 restrains the stress from being concentrated into the core, thereby lowering the occurrence of structural asymmetry loss and the like. Hence, anoptical fiber which can reduce the transmission loss caused by the Rayleigh scattering loss and the like as a whole, and a method of making the same can be obtained.

摘要翻译： 准备在芯平均粘度eta0与总平均粘度etat之间具有2.5或更小的粘度比Reta = eta0 / etat的光纤预制棒2，并由拉丝炉11拉伸以产生光纤3， 然后将其加热到预定范围内的温度，以便通过设置在拉丝炉11下游的加热炉21进行退火。这里，在加热炉21中退火后，光纤内的假想温度Tf降低，从而降低 瑞利散射损失。 同时，Reta <= 2.5的粘度比条件限制了应力集中到芯中，从而降低了结构不对称损失的发生等。 因此，可以获得可以降低由瑞利散射损耗等引起的传输损耗等的整体的光纤，以及其制造方法。