The traditional fiber optic cable connection is connected by fiber splicing machine. This method has great limitations and the construction is very complicated. Later, it was found that the thermal shrinkable sleeve was used to protect the optical fiber, and the connection loss was small. This connection method was also called hot fusion. For many years, this method was used in outdoor optical fiber connection operation.

The shortcomings of the hot melting method are: the instrument is expensive, the continuation needs electricity, the operation needs training, the maintenance costs are higher, and the operating site is limited. This continuation method or habit can still be applied to the outdoor construction section in the FTTH construction, but the efficiency and convenience of construction in a narrow indoor environment is greatly reduced. The technology of fiber optic mechanical splicing has been paid more attention in the construction of FTTH tube. As the name implies, optical fiber mechanical connection does not require special instruments to use mechanical clamping method to use the V_groove guide rail principle to connect the two cut optical fibers together, without electricity, and the production tool is compact; optical fiber mechanical connection mode has also become a `cold connection', this way has two key points: 1, optical fiber cutting. The flatness of the face; 2, the fixed reliability of optical fiber clamping.

The termination of a fiber optic cable is defined as follows: when a fiber optic cable reaches a node, all the cores are processed, and the fiber optic cable is no longer extended. Direct fusing is the direct fusing and butting of optical fiber and another external optical fiber cable. Traditional nodes are mostly at the junction box of optical fiber cable.

Jumping is the use of fiber optic cable and tail fiber fusion method, after the end of the treatment can be flexible configuration of mobile connectors, the traditional nodes are mostly optical cable cabinet, optical fiber wiring rack.

Fiber-optic joints are also called fiber-optic joints and protective heat-shrinkable tubes in the fiber-optic joints industry. They are composed of transparent heat-shrinkable tubes, hot-melt tubes and stainless steel needles (or ceramic rods/quartz rods).The transparent outer layer is convenient for detecting whether the joint of the optical fiber joint is correct,The optical fiber can be assembled simply and safely, and the optical transmission characteristics of the optical fiber can be maintained after shrinkage, providing strength and protection to the junction of the optical fiber. The operation is simple and reliable, and it can avoid the damage of optical fiber during installation.

The main structure of the heat shrinkable tube for optical fiber connection is as follows:

The use of optical fiber joint to protect heat shrinkable tubes is mainly characterized by:

1. good transparency, optical fiber bonding situation at a glance.

2. fast shrinkage and high construction efficiency.

3. soft and high strength.

4. it is easy to use and reliable in performance.

5. use temperature: -45℃～105℃ 

6. environmental protection standard: RoHS