2) According to the optical cable structure, it is divided into: bundled optical cable, layered optical cable, tightly hugged optical cable, ribbon optical cable, non-metallic optical cable and branchable optical cable. 2) Dyeing of optical fibers: use standard full chromatogram to identify, requiring. There are mainly three types of cables used in network connection: twisted pair cables, coaxial cables, and fiber optic cables. Among them, fiber optic cables have become more and more popular in recent years for their information carrying at a high speed and it may gradually replace copper wires. Fiber optic cables are broadly divided into two types: "single mode" and "multimode" based on their characteristics. Each mode has a different way of transmitting optical signals and is suitable for different applications, so it is important to select the correct mode depending on the intended use. Fiber Optics or Optical Fiber is a technology that transmits data as a light pulse along a glass or plastic fiber. This advanced cabling solution allows fast, secure data transfer and telecom over long distances.