Internet cables under the ocean 's structural design and material selection

      The main structure of the central tube type submarine optical cable is divided into three parts, namely the cable core, sheath, armor and outer sheath.

      The corrosion rate of submarine optical cables is very high due to long-term immersion in high-concentration seawater. If the steel wire is in direct contact with seawater, the life of a general 6mm thick galvanized steel wire in the South China Sea will not exceed 8 years, and the life of the North Sea will not exceed 12 years.

      In order to increase the corrosion resistance of the steel wire, from the structure of the optical cable, it is necessary to avoid direct contact between the steel wire and sea water. Therefore, the gap in the steel wire armor layer and the outer layer of the steel wire must be filled with modified asphalt, which has high bonding strength between the asphalt and the steel wire, non-sticking at high temperatures, and not brittle at low temperatures. Therefore, the interstitial buffer layer in the armor layer and the double-layer outer layer polypropylene rope must be filled with asphalt by interference. In this way, the steel wire will not be in direct contact with sea water, which can greatly increase its anti-corrosion life.

      In case the fiber optic cable is hooked by the ship anchor, the outer coating and the asphalt protective layer of the fiber optic cable will be damaged to a certain extent, and there may be direct contact between the steel wire and seawater in some sections of the fiber optic cable. Therefore, the choice of the material of the armored steel wire is also very important. of.

      The current steel wire, one of which is a domestically made alloy coated steel wire, whose coating composition is an alloy of zinc, aluminum, and magnesium, has an anti-corrosion life approximately 3.5 times longer than that of ordinary galvanized steel wire, and is generally welcomed. Another kind of imported submarine cable steel wire has an anti-corrosion life of more than 30 years, so the choice of the material of the submarine optical cable is also an extremely important part of improving its life.

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