Optical fiber cable is a new generation of transmission media, optical fiber cable has the advantages of good anti-electromagnetic interference, strong confidentiality, fast speed, large transmission capacity and so on.Therefore, its price is also more expensive, and it is rarely used in household occasions. There are two different types of fiber that are more common, namely single-mode fiber and multi-mode fiber.Multimode fiber is generally used for network connections in the same office building or in a relatively close area. Single-mode fiber transmits data at higher quality and over longer distances, and is often used to connect between office buildings or more geographically dispersed networks.