Views: 411 Author: Site Editor Publish Time: 2020-07-14 Origin: Site
The connection of fiber optic is to connect two fiber optical together permanently and couple the optical power between the two fiber optic.
Fiber optic connector can be generally divided into two types: fixed connection of fiber optical (commonly known as dead connector), movable connection (commonly known as live connector). The movable connection is generally connected in the machine room, and the fiber optical with the connector is connected by using the optical flange. This method is flexible and convenient, and the operation is simple. Fixed connection of fiber optical is a more common method in the construction of optical cable lines. There are two connection methods: welding method and non-welding method. Most of the fixed connection of optical fiber adopts welding method. The advantage of this method is that the contact loss of fiber optical is small, the reflection loss is large, it is safe and reliable, and it is little affected by the outside environment. The biggest disadvantage is the need for expensive welding equipment.
1) Strip the optical fiber coating
Use a coating stripper to strip the fiber optical coating about 30 ~ 40mm, and then wipe the surface of the fiber optical with clean paper or gauze soaked in anhydrous alcohol until the squeak sound is made. During stripping, it should be noted that the force should be moderate and even. Excessive force will damage the core or cut the fiber optic. If the force is too small, the fiber optical coating cannot be stripped off.
2) End Face Treatment of Fiber Optic
This is the key to the processing technology of fiber optical connection. The quality of the end face directly affects the connection quality. Fiber optical cutting is to use the brittleness of quartz glass to achieve the smooth cut surface of the fiber optical. If the operation is improper, the cross section of fiber optic will be inclined, notched, burred, or damaged, causing poor connection. The cutting length of the fiber core is determined according to the limitation of the welding machine or the length of the heat shrinkable tube, which is generally 16 ± 0.5mm.
3) Welding connection of fiber optic
Place the prepared optical fiber in the V-groove of the welding machine, and then press the "SET" button to complete the entire welding connection process (including interval adjustment, focus adjustment, cleaning, end face inspection, inspection, estimated loss, etc.), the end face should not be in contact with any place during the operation, and the core should be kept clean.
4) Protection of fiber optic connector
It is mainly to increase the tensile and bending strength of the connection. Gently move the core of the heat-shrinkable tube to the welding part (before connecting, put the protection tube into one end of the fiber optic), the welding part must be in the center of the protection tube, and put the protection tube into the heater of the welding machine. Gently press down with the left optical fiber to close the left optical fiber clamp, and then gently press down the right fiber to close the right fiber, finally close the heater cover. When the "HEAT" key is pressed, the red light on the panel lights, and the heater starts to heat until the end of the protective sleeve is completely contracted. At the same time, it should take care to ensure that the fiber-coated parts are clean, keep the fiber optic straight, and do not twist the welding part of fiber optic. If the shrinkage is uneven, the heating time can be extended, and if bubbles are generated during heating, the heating temperature can be lowered.
5) Remaining fiber optic
In order to ensure the connection quality of the fiber optical and facilitate the future repair, there must be a certain length of residual fiber on both sides of the connector. It is generally used for coiled fiber. The length of the residual fiber should be greater than 1 meter. Different connection boxes of optical cables have different processing methods. The general method is to wind the residual fiber on the tray of the connection box. Try to make a large circle, and the bending radius should not be less than 3.5cm.