Waterproof analysis of outdoor leather cable

For outdoor optical fiber cables, in addition to focusing on transmission performance such as bandwidth and loss, there is also a very important technical indicator, that is, the water resistance of optical fiber cables.

In a humid environment, too much moisture will easily cause the water peak attenuation of the optical fiber, which will lead to a decrease in the transmission performance of the optical fiber cable; at the same time, the penetration of moisture will easily corrode the optical fiber cable and cause the fiber to break, which may block the communication system. Bring great inconvenience.

In order to ensure the transmission performance of the outdoor sheath optical cable, we need to ensure the water resistance of the optical cable. The traditional method is to use oil-filled optical cable. Because the ointment has excellent thixotropy and water resistance, it can play a good role in buffering the optical fiber. , Shockproof and waterproof effects, by filling all the space in the casing of the optical cable with water-blocking ointment, the water-blocking effect is achieved.

According to the water-blocking structure of the optical fiber cable, the traditional oil-filled optical cable can be divided into two types: oil-filled and semi-dry. The oil-filled type means that the loose tube and the cable core gap are filled with ointment; the semi-dry optical cable means that the loose tube is filled with fiber paste, and the cable core gap uses dry water-blocking powder, water-blocking yarn, and water-blocking tape. material to meet the water blocking requirements. However, both oil-filled and semi-dry optical cables contain ointment, and the existence of ointment has brought many problems to optical cables.

Outdoor drop cable

But now there is a fully dry optical cable that can avoid the above shortcomings. Full-dry optical cable refers to the use of water-blocking yarn in the loose tube, and dry-type water-blocking materials such as water-blocking powder and water-blocking tape are used in the gap between the cable cores to meet the requirements of water-blocking. In layman's terms, the entire optical cable is zero grease.

Both water-blocking tape and water-blocking yarn are dry water-soluble swelling materials. Compared with ointment, they have the advantages of light weight, convenient cable connection, no need to clean ointment, and good compatibility with other materials. Its working principle is that when moisture enters the optical cable and contacts with the water-absorbing resin of the water-blocking material, the water-absorbing resin expands rapidly and fills all the gaps in the optical cable, thereby preventing the flow of moisture in the optical cable. The thin water-blocking yarn in the loose tube has the characteristics of high water absorption expansion rate, which has the effect of double-layer water-blocking and moisture-proof.

To sum up, the fully dry outdoor optical cable overcomes the various shortcomings of the oil-filled optical cable, and also maintains excellent water resistance performance, and has become the first choice for outdoor leather optical cables.