公开(公告)号：US20050000253A1

公开(公告)日：2005-01-06

申请号：US10874456

申请日：2004-06-23

申请人： Kang Xie ,  Shuqiang Zhang ,  Qingrong Han ,  Tiejun Wang ,  Chenghou Tu ,  Raji Matai

发明人： Kang Xie ,  Shuqiang Zhang ,  Qingrong Han ,  Tiejun Wang ,  Chenghou Tu ,  Raji Matai

IPC分类号： C03B37/018

CPC分类号： C03B37/01892 ,  C03B37/01807 ,  C03B37/0183 ,  C03B37/01853 ,  C03B37/01861 ,  C03B2201/04 ,  C03B2201/075 ,  C03B2201/12 ,  C03B2201/22 ,  C03B2201/31 ,  C03B2207/30 ,  C03B2207/32

摘要： The present invention directs to a method of manufacturing low water peak single mode optical fiber, which comprises performing deposition in a substrate tube using PCVD technology, whereby a deposited layer of a certain construction design is formed on the inner wall of the substrate tube, melt contracting the substrate tube into a solid core rod according to melt contraction technology, producing an optical fiber preform by combining the core rod and a jacket tube of low hydroxyl content by means of RIT technology or by depositing an outer cladding on the outer surface of the core rod using OVD technology, sending the optical fiber preform into a fiber drawing furnace to draw it into an optical fiber, wherein: in the PCVD technology, the content of impurities in a gas mixture of raw materials, which is characterized by the infrared spectrum transmissivity thereof, is required to a transmissivity of 90% or greater, the water content in O2 is 100 ppb or less, the water content in C2F6 is 1000 ppb or less, the hydroxyl content of the substrate tube is 1000 ppb or less, the dynamic leak rate of a deposition machine is 1.0×10−5 mbar·l/s or less; during melt contraction of the substrate tube, the dynamic leak rate of a melt contraction machine is 1.0×10−5 mbar·l/s or less; the hydroxyl content of the jacket tube of low hydroxyl content is required to be 10 ppm or less; the relative humidity of environment during the process of manufacture is 25% or less; the ratio of the cladding diameter to the core layer diameter (b/a value) in the waveguide structure of the optical fiber is from 2.0 to 7.0.

摘要翻译： 本发明涉及制造低水峰单模光纤的方法，其包括使用PCVD技术在衬底管中进行沉积，由此在衬底管的内壁上形成一定的结构设计的沉积层，熔化 根据熔体收缩技术将衬底管收缩成实心芯棒，通过RIT技术将芯棒和低羟基含量的护套管组合在一起，或通过在外部表面上沉积外包层来生产光纤预制棒 使用OVD技术将光纤预制棒发送到光纤拉丝炉中，将其拉入光纤中，其中：在PCVD技术中，原料气体混合物中的杂质含量，其特征在于红外光谱 透过率为90％以上，O 2的含水量为100ppb以下，C2F6的含水量 为1000ppb以下，基材管的羟基含量为1000ppb以下，沉积机的动态泄漏率为1.0×10 -5 mbar·l / s以下。 在基材管熔融收缩期间，熔体收缩机的动态泄漏率为1.0×10 -5 mbar·l / s以下; 低羟基含量的护套的羟基含量为10ppm以下; 制造过程中环境的相对湿度为25％以下; 光纤的波导结构中的包层直径与芯层直径的比（b / a值）为2.0〜7.0。