Identify the quality of optical fiber cable

First, skin: indoor cable is generally made of polyvinyl or flame retardant polyvinyl, the appearance should be smooth, bright, flexible, easy to peel off. Poor quality cable skin finish is not good, easy and inside the tight sleeve, aramid adhesion.

The PE sheath of outdoor optical cable should be made of high quality black polyethylene. After forming the cable, the outer skin is smooth, bright, uniform thickness and no small bubbles. The skin of inferior optical cable is generally produced with recycled materials, which can save a lot of costs. The skin of such optical cable is not smooth, because there are a lot of impurities in the raw materials, the cable skin made has a lot of very small pit wow, a long time will crack, water.

Two, optical fiber: Regular optical cable manufacturers generally use large factory A grade fiber core, some low quality optical cable usually use C grade, D grade fiber and unknown smuggling fiber, these fiber because of complex sources, factory time is longer, often has been a tide discolor, and multi-mode fiber is often mixed with single-mode fiber, and general small factory lack of necessary detection equipment, can not judge the quality of fiber. Because the naked eye can not distinguish such optical fiber, the construction often encountered problems are: the bandwidth is very narrow, short transmission distance; Uneven thickness, can not butt with tail fiber; Optical fibers lack flexibility and break as soon as they are bent.

Three, strengthen steel wire: regular manufacturers of outdoor cable wire is after phosphating treatment, the surface is gray, such wire cable does not increase hydrogen damage, no rust, high strength. Inferior optical cable is generally replaced by fine iron wire or aluminum wire, identification method is easy to look white, pinch in the hand can be bent at will. With such steel wire production of fiber optic cable hydrogen loss, a long time, hanging fiber box at both ends will rust fracture.

Four, steel armor: regular production enterprises use double-sided brush anti-rust coating longitudinal bandaging grain steel belt, inferior optical cable is ordinary iron sheet, usually only one side of the anti-rust treatment.

Five, loose sleeve: optical fiber in the optical fiber loose sleeve should be used PBT material, such sleeve strength is high, no deformation, anti-aging. Inferior optical cable is generally made of PVC sleeve, such sleeve diameter is very thin, with a pinch of the hand flat, a bit like we drink drink straw.

Six, fiber paste: outdoor fiber paste in the optical cable can prevent fiber oxidation, because of moisture into the moisture, poor fiber used in the fiber paste is very little, seriously affect the life of the fiber.

Seven, aramid, also known as Kevlar, is a kind of high strength chemical fiber, the most used in the military industry, military helmets, bulletproof vests is the production of this material. At present, only DuPont and Akzo in the Netherlands can produce, and the price is about 300 thousand a ton. Indoor optical cable and electric power overhead optical cable (ADSS) are made of aramid yarn as strengthening parts, because of the high cost of aramid, poor indoor optical cable generally make the outer diameter is very fine, so that a few strands of aramid can be used to save costs. Such fiber optic cables can easily be pulled and broken when passing through the tube. ADSS cable because it is based on the span, second wind speed to determine the use of aramid fiber cable, generally dare not cut corners.