The application structure of OPGW optical cable has experienced decades of development mileage, the world has developed and produced dozens of OPGW optical cable structure, cable core structure mainly includes the following:
1) Stranding + aluminum tube structure;
2) Central beam tube + aluminum tube structure;
3) Aluminum frame structure;
4) Spiral aluminum tube structure;
5) single layer stainless steel pipe structure (center stainless steel pipe structure, stainless steel pipe layer stranded structure);
6) composite stainless steel pipe structure (center stainless steel pipe structure, stainless steel pipe layer stranded structure).
OPGW cable core outside the conductor wire mainly have AA wire (aluminum alloy) and AS wire (aluminum clad steel wire) two at present, all over the world are adopt the stainless steel tube OPGW cable structure, and stainless steel tube optical fiber unit structure is divided into two kinds: single stainless steel tube optical fiber unit and composite stainless steel tube optical fiber unit, the main of composite stainless steel tube optical fiber unit Characteristics to have
(1) Optical fiber online residual length control, can obtain and ensure a very accurate and regular residual length;
(2) in the inner wall of stainless steel pipe to add a layer of lined pipe, effectively improve the mechanical strength of stainless steel;
(3) The production of optical fiber unit does not need to carry out the cold drawing process of steel pipe, which avoids the internal stress defects caused by cold drawing;
(4) The composite stainless steel tube makes the optical fiber exempt from welding arc burn, smooth inner plastic tube, and the optical fiber from the wear of the sharp edge of the weld.
The main characteristics of stainless steel tube OPGW optical cable are:
(1) The product structure is consistent with the traditional ground wire structure;
(2) make full use of the physical and electrical characteristics of the wire;
(3) in the steel tube specifications of the optical fiber to accommodate the number of fiber core increase or decrease does not affect the cable diameter;
(4) cable compact structure, mechanical strength, cable external longitude is small;
(5) the construction method of optical cable is similar to the traditional ground construction method.
OPGW optical cable products have the following characteristics:
1.The fiber length consistency is good, the quality of steel pipe weld is high, the filling rate of fiber oil paste in the steel pipe is high.
2. The fiber loss coefficient is small. According to the optical path test, the average loss of most fiber lines in the L550RIM window (including joints) is less than 0.2ldB/Km.
3, technical services to satisfy users. In the engineering design stage, Tongguang carefully understand the line engineering situation, and the comrades of the design institute communicate with each other, discuss together, and obtain consistent opinions in the construction stage, Tongguang timely dispatch engineers with rich practical experience for on-site supervision and fiber fusion.