Different from BNC connector which is widely used in a / v industry, optical fiber connector develops gradually with the continuous maturity of optical fiber technology. The impact of copper connector on AV system signal loss is generally not great, but the impact of optical fiber connection is different, it will have a great impact on each interface in the transmission system. Let’s take a look at some problems in the optical fiber physical connection. The optical fiber transmission equipment itself can command the connection, but in some cases, most or almost all of the optical fiber transmission connection choices are made by human. The amount of signal lost by optical fiber cable in the process of signal transmission is mainly determined by the quality and type of optical fiber cable used, and each connection end will produce a certain amount of signal loss. Depending on the type of fiber connector selected by the user, the total amount of signal loss at the connection end may exceed the amount of signal loss generated by the fiber cable itself.
In the design of optical fiber system, if the system can operate normally, it will achieve a very good effect. In the design of the system, we need to consider some unexpected problems that may occur in the system, and make the system operate normally. In the system design, we should consider the worst situation of the system, and make the corresponding plan, looking forward to better operation effect. Fiber connector designers must keep this concept in mind.
In the system design, the safe and stable system connection requires smooth and square fiber end. The end-to-end connection must be accurate, even up to micron, one millionth of a meter. The diameter of commonly used multimode fiber ranges from 50-62.5 μ m, while the diameter of single-mode fiber is only 8-9 μ M. Comparing this diameter with the diameter of a hair (17-180 microns), we can see that any mistake can bring disastrous losses.
Optical fiber connection is very strict on the precision of the equipment, so the connector must be very clean. Optical fiber connectors and accessories are usually installed in a sleeve. A finger print or external dust may seriously affect the performance of the connector, and even lead to transmission failure. Therefore, when the connector is not connected, it should be kept in a clean protective sleeve.
In the connection, we should also wedge the optical fiber connector tightly. In the current design of all optical fiber connectors, it is through the “ferrule” to ensure that the connector is correctly matched. The optical fiber terminal is a permanent component in the ferrule by means of glue or crimping. After inserting the built-in optical fiber, the ferrule end is ground smooth to provide a smooth interface for the optical fiber connection of the connector. Ferrules are usually made of relatively hard materials, such as ceramics. Of course, they can also be made of stainless steel, plastic or tungsten carbide materials. The general ferrule diameter of SC, st and FC is 2.5 mm, and that of LC is 1.25 mm. Because the functional characteristics of ferrule can be produced according to the precision requirements, it has become the most important characteristic of optical fiber connector. Among many connecting ferrules, the spring type container connecting ferrule ensures the coaxial alignment between optical fiber and led or laser source.
With the development of technology and the expansion of application, optical fiber connector also develops rapidly. At present, there are about 12 or more kinds of optical fiber connectors used in the market, each of which arises at the historic moment to meet specific needs. Of course, there are certain technical limitations. Now the trend of the market is mainly towards the development of the connector mode of moderate price and compact type, which can support the greater transmission density required by the new transmission distribution system. As users expect, the continuous development of the telecommunications industry has also promoted the large-scale application of optical fiber, which is largely due to the rapid growth of demand for optical fiber connection in various types of communication and entertainment services.