The main methods are permanent connection, emergency connection and movable connection.

1. Permanent optical fiber connection (also called hot melt)

This connection is to melt and connect the connection points of the two optical fibers together by discharging. It is generally used for long-distance connection, permanent or semi permanent fixed connection. Its main feature is that the connection attenuation is the lowest among all connection methods, and the typical value is 0.01~0.03dB/point. However, during connection, special equipment (welding machine) and professionals are required for operation, and the connection points also need to be protected by special containers.

2. Emergency connection (also called cold melting)

Emergency connection mainly uses mechanical and chemical methods to fix and bond two optical fibers together. The main feature of this method is that the connection is fast and reliable, and the typical attenuation of the connection is 0.1~0.3 dB/point. However, the connection point will be unstable after long-term use, and the attenuation will also increase significantly, so it can only be urgently needed in a short time.

3. Active connection

Active connection is a method to connect sites to sites or sites to optical cables by using various optical fiber connection devices (plugs and sockets). This method is flexible, simple, convenient and reliable, and is often used in computer network wiring in buildings. Its typical attenuation is 1dB/connector.