Choose Their Own Way To Share Models Of Fiber Optic Cable


    Green Telecom is a company specializing in the production of communication equipment such as Fiber Optic Splice Closure , Fiber Closure, Inline Closure, DOME Fiber Closure, etc., and will bring you various communication knowledge from time to time.

    The purchase of optical cable is much more complicated than coaxial cable. It can't be compared simply by the price of several cores. It should be considered according to the structural form of optical cable, raw materials, production technology and technical indicators. Do not choose too cheap. The product.

    First, select the cable according to the purpose

    According to the purpose of purchasing the corresponding optical cable, depending on the application, the optical cable can be divided into overhead optical cable, direct buried optical cable, pipeline optical cable, submarine optical cable and metal-free optical cable. The overhead cable requires high strength and small temperature difference coefficient; the direct buried cable requires anti-buried, anti-pressure, moisture-proof, anti-humidity characteristics and chemical resistance; the pipeline cable and the submarine cable must have good resistance to water pressure, tension and water resistance; The metal cable can be erected together with the high voltage wire. The insulation is better. Although there is no iron core reinforcement, it must have a certain tensile strength.

    Second, select the cable according to the number of cores

    According to the number of cores, the structure of different types of optical cables can be divided into central bundle tube type, layer stranding type, skeleton type and belt type, etc. The structure of different uses is different, and the user can make corresponding requirements according to the line condition. Generally, the center bundle tube type is adopted below 12 cores, and the center bundle tube type process is simple and low in cost, and is competitive in an overhead line laying or a trunk line network with good pipeline protection; the layer stranded optical cable adopts a center placed steel strand or single The wire is reinforced, and the SZ continuous synthetic cable is used, and the number of cables can be up to 144 cores. Its biggest advantage is waterproof, strong pull resistance, and strong side pressure. Can be used for direct burial. At the same time, it is easy to fork, that is, when the optical fiber of the optical cable needs to be separately used, it is not necessary to break the entire optical cable, and only the optical fiber to be bifurcated can be disconnected, which is for the data communication network. It is advantageous to add optical nodes along the cable television network; the number of cores of the ribbon cable can be thousands of cores, which are arranged in a row of 4 to 12 core fibers to form a ribbon fiber unit, and then the plurality of ribbon units are fixed. The mode is arranged into a cable, and the network-level optical cable generally adopts two types: a bundle tube type and a layer continuous type.

    Third, select fiber optic cable according to materials

    The materials used in the cable and the selection of the production process cable materials are the key to the service life of the cable. The manufacturing process is an important link that affects the quality of the cable, and the products are stable in process and of good quality. In the whole process of cable production, the fiber additional loss is basically not included. The main materials used in fiber optic cable are: core, fiber ointment, sheath material, PBT (polybutylene terephthalate), which have different quality requirements, and the core requires a large capacity to charge. Higher signal-to-noise ratio, lower bit error rate, longer amplifier spacing, higher information carrying capacity; fiber ointment refers to the grease filled in the bundle tube, the role of which is to prevent moisture in the air. Erosion of the fiber, the second is to cushion the fiber, the buffer fiber is affected by vibration or impact. Ointments have strict quality requirements, emphasizing ultra-low hydrogen evolution, ensuring good low-temperature characteristics of the cable, and preventing "hydrogen damage" from causing serious damage to the cable. The sheath material plays an important role in the long-term reliability of the cable, and is the key to determining the tensile, flattening, bending characteristics, temperature characteristics, natural aging resistance (temperature, irradiation, chemical corrosion) characteristics of the cable, and the fatigue characteristics of the cable. Therefore, high-density polyethylene material (PE) should be used, which has high hardness, good tensile and compressive resistance, and is not easy to damage the outer skin. PBT is a thermoplastic engineering plastic for making secondary cable (beam tube) of optical cable, and must have Yang modulus. High (1600/mm2), low linear modulus (1.5×10-4), good chemical corrosion resistance, good processing characteristics and low friction coefficient. The fiber sleeving is made of PBT material, so that the fiber bundle tube unit has good side pressure and temperature resistance. In places where the hydrolysis resistance requirements are relatively high, in order to ensure the long life of the cable, it is necessary to use a hydrolysis-resistant PBT material.

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