How to distinguish the quality of fiber optic cables?

1. Outer sheath: Indoor optical cable is generally made of polyvinyl chloride or flame retardant polyvinyl chloride. The appearance should be smooth, bright, flexible, and easy to peel off. The outer sheath of a poor quality optical cable is not good, and it is easy to adhere to the tight sleeve and aramid inside. The PE sheath of the outdoor optical cable should be made of high-quality black polyethylene. After the cable is formed, the sheath is flat, bright, uniform in thickness, and free of small air bubbles. The outer sheath of inferior optical cables is generally produced with recycled materials, which can save a lot of costs. The outer skin of such optical cables is not smooth. Because there are many impurities in the raw materials, the outer sheath of the optical cable has a lot of very small potholes. water. 2. Optical fiber: Regular optical cable manufacturers generally use large-scale A-grade cores. Some low-quality and low-quality optical cables usually use C- and D-grade optical fibers and smuggled optical fibers from unknown sources. These optical fibers have complex sources and long delivery times. Often the tide is discolored, and multimode fiber is often mixed with single-mode fiber. Generally small factories lack the necessary testing equipment and cannot judge the quality of the fiber. Because such optical fibers cannot be discerned by the naked eye, common problems encountered during construction are: very narrow bandwidth and short transmission distance; uneven thickness, which cannot be connected with pigtails; optical fibers lack flexibility, and break when they are bent. 3. Reinforcing steel wire: The steel wire of the outdoor optical cable of the regular manufacturer is phosphated, and the surface is gray. Such steel wire does not increase hydrogen loss, rust, and high strength. Inferior optical cables are generally replaced with thin iron or aluminum wires. The identification method is easy to be white in appearance, and can be bent at will in the hand. Optical fiber cables produced with such steel wires have a large hydrogen loss and a long time, and the two ends of the hanging optical fiber box will rust and break. Fourth, steel armor: regular manufacturers use double-sided brush anti-rust paint longitudinal banding steel strip, inferior optical cable using ordinary iron, usually only one side for anti-rust treatment. V. Loose tube: PBT material should be used for the loose tube of optical fiber in the optical cable. Such a tube has high strength, does not deform, and is resistant to aging. Inferior optical cables are generally made of PVC sleeves. Such sleeves have a thin outer diameter and are flattened with a pinch, which is a bit like a drinking straw for us. 6. Fiber paste: The fiber paste in outdoor optical cables can prevent the fiber from oxidizing. Because water vapor enters the moisture, etc., the fiber paste used in low-quality fiber is rarely used, which seriously affects the life of the fiber. 27. Aramid, also known as Kevlar, is a high-strength chemical fiber. It is currently used most in the military industry. Military helmets and bulletproof vests are produced from this material. At present, only DuPont and Akzo in the Netherlands can produce, and the price is about 300,000 tons. Indoor fiber optic cables and power overhead optical cables (ADSS) both use aramid yarn as a reinforcing member. Due to the higher cost of aramid, inferior indoor fiber optic cables generally have a thin outer diameter, which can save costs by using a few strands of aramid. Such an optical cable can be easily broken when it is passed through a tube. Because ADSS optical cables determine the amount of aramid used in optical cables based on span and wind speed per second, they are generally afraid to cut corners. Kevlar is not included because we use a central beam tube light armored cable for testing. Eighth, the diameter of the optical cable, for the central beam tube optical cable, the diameter standard is generally about 7.5mm, plus or minus 0.2mm is also possible. Below we use a caliper to measure the diameter of the finite fiber optic cable.