The traditional optical cable connection is connected by optical fiber fusing 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 fibers, and the connection loss was low. This connection method is also called thermal fusion. For many years, outdoor optical fiber connection was used in this way. Optical fiber connection is the connection of two optical fibers, which is a fixed connection method.
The shortcomings of hot-melt method are: expensive instrument, power consumption for connection, training for operation, high maintenance cost and limited operation site. This continuation method or habit can still be applied to the outdoor construction section in FTTH construction, but its efficiency and convenience in the narrow indoor environment are greatly reduced. In the process of FTTH construction, optical fiber mechanical connection technology has been paid attention again. As the name implies, optical fiber mechanical connection does not require special instruments to use mechanical pressure clamping method, using V-groove guide principle to connect two cut optical fibers, without electricity, and small tools; optical fiber mechanical connection mode has also become a "cold connection". This way has two key points:
1. The smoothness of the end face of optical fiber cutting;
2. Fixed reliability of optical fiber clamping.
The end of the cable is defined as follows: when a cable reaches a node, it processes all the cores, and the cable does not extend. Direct fusion is the direct fusion and docking of the optical fiber and another external optical cable. Most of the traditional nodes are at the junction box of the optical cable.
The splicing method is the fusion of fiber optic cable and tail fiber. After processing, the terminal movable joint can be flexibly configured. The traditional nodes are mostly the cable distribution box and the fiber optic distribution frame.
Thermal shrinkable pipes for optical fiber connections, also known as optical fiber bonding protection heat shrinkable pipes, are composed of transparent heat shrinkable pipes, hot melt pipes and stainless steel needles (or ceramic rods/quartz rods). The transparent outer layer is easy to detect whether the connection of the optical fiber joint is correct or not, so that the optical fiber can be assembled simply and safely. After contraction, the optical transmission characteristics of the optical fiber can be maintained, and the strength and protection of the optical fiber joint can be provided. It is easy to operate, reliable in performance and can avoid the damage of optical fibers during installation.
The main structures of heat shrinkable tubes for optical fiber connections are as follows:
The use of optical fiber joint to protect heat shrinkable pipes has the following characteristics:
1. Transparency is good, the bonding condition of optical fibers is clear at a glance.
2. Fast shrinkage and high construction efficiency
3. Soft and strong
4. Easy to use and reliable performance
5. Use temperature: -45 ~105 C
6. Environmental standards: RoHS