Fiber optical cable is used widely in our life, so how to identify the good fiber optical cable is important. The quality of fiber optical cable can be roughly identified from the following aspects:
1. Jacket: Indoor fiber optic cable generally adopts poly-recording ethylene or flame-retardant poly-recording ethylene. The appearance should be smooth, bright, flexible and easy to peel off. Inferior optical cable has a poor jacket finish and is easy to adhere to tight sleeves and aramid. The PE sheath of the outdoor optical cable should be made of high-quality black polyethylene. After the cable is formed, the outer jacket is smooth, bright, uniform in thickness and free from air bubbles. The outer jacket of inferior optical cable is generally produced using recycled materials. The cable has a rough jacket. Because there are many impurities in the raw material, it can be found that there are many tiny pits in the outer jacket of the cable. After laying for a period of time, it will crack and seep.
2. Optical fiber: Regular optical cable manufacturers generally use the A-class core of the big factory. Some low-cost and inferior optical cables usually use C-class, D-class optical fibers and unidentified smuggled optical fibers. These fibers have complicated source and long service time. It is often tidal and discolored, and multimode fiber is often mixed with single-mode fiber. However, small factories generally lack the necessary testing equipment and cannot judge the quality of the fiber. Because the naked eye can't distinguish such an optical fiber, the problems encountered during construction are: the bandwidth is narrow, the transmission distance is short, the thickness is not uniform, and it cannot be docked with the pigtail; the fiber lacks flexibility, and the fiber is broken when it is bent.
3. Strengthening steel wire: The steel wire of the outdoor optical cable of the regular manufacturer is phosphating, and the surface is gray. Such steel wire does not increase hydrogen loss, does not rust, and has high strength after cable forming. Inferior optical cables are usually replaced by thin iron wire or aluminum wire. The identification method is very easy - the appearance is white, and the pinch can be bent freely on the hand. The cable produced by such a steel wire has a large hydrogen loss, and the time is long, and both ends of the hanging fiber optic box will rust and break.
4. Loose tube: The loose tube with optical fiber in the cable should use PBT material, which has high strength, no deformation and anti-aging. Inferior optical cables usually use PVC material to produce casings. Such casings have a thin outer diameter and are flattened by hand. They are no different from beverage straws, and lose the protection of optical fibers in one to three years.