The development of the optical cable industry has gone through decades of ups and downs, and has made many remarkable achievements. The emergence of OPGW optical cable once again shows a major breakthrough in technological innovation and is well received by customers. In the stage of rapid development, the life of the optical cable is mentioned again. How to extend the service life of OPGW optical cable, mainly to pay attention to these technical points.
1. Optical cable coating material selection and wire drawing process
The main reasons for the increased loss of functional OPGW cables include hydrogen loss, cable cracking, and cable stress. Through the actual test, it is found that after years of use, the mechanical properties, welding properties and optical properties of the OPGW cable have not changed. Scanning electron microscope did not find obvious abnormal phenomena such as micro-cracks. However, the coating prospects for OPGW cables are not optimistic. The attenuation of optical cables with high modulus, dense coating and large peeling force increases significantly.
2, ointment filling planning
OPGW fiber paste is an oily substance. It is a mineral oil or complex oil based mixture that blocks water vapour and buffers fiber optic cables. The function of the fiber paste was assessed by measuring the oxidative induction period of the fiber paste. The increased acid value of the ointment after oxidation resulted in increased hydrogen evolution. After the oil slurry is oxidized, it will affect the stability of the optical cable structure, resulting in a reduction in stress, and the optical cable will be affected by vibration, shock, twist, temperature difference, and topographic changes. It is emphasized that the buffering effect of optical fiber paste on the optical cable is weakened, thereby reducing the safety of the OPGW optical cable. The direct contact between the optical fiber paste and the optical cable is the most important direct cause of the deterioration of the optical cable performance. Fiber paste will slowly deteriorate over time, often coagulating into small particles, which then gradually evaporate, differentiate and dry.
3. Loose tube size
The influence of loose tube size on the life of OPGW cable is mainly reflected in the induced stress. When the size is too small, the stress on the optical cable cannot be relieved due to factors such as temperature change, mechanical stress, and the interaction between the filler and the optical cable, which will accelerate the decline of the life of the OPGW optical cable and cause aging.
In actual use, the much-anticipated OPGW optical cable often fails due to external factors and some quality problems. To prolong life, you need to grasp the main technical points, although the discussion is more complicated. But extending the service life of OPGW cables is not impossible.
Post time: Jul-12-2022