According to different classification methods, fiber optic connectors can be divided into different types, according to the different transmission media can be divided into single-mode fiber optic connectors and multi-mode fiber optic connectors; according to the structure can be divided into FC, SC, ST, D4 , DIN, double cone, MU, LC, MT and other types; according to the connector pin end can be divided into FC, PC (UPC) and APC; according to the number of fiber core points,The In the practical application process, we generally in accordance with the different structure of the optical fiber connector to distinguish the following simple to introduce some of the more common fiber connector:
(1) fiber connector
This connector was first developed by the Japanese NTT.FC is the abbreviation of Ferrule Connector, indicating that the external reinforcement is the use of metal sets, fastening for the ear screws, FC type of connector, the use of ceramic pin docking face Is the plane contact method (FC). This kind of connector has the advantages of simple structure, convenient operation and easy manufacture, but the fiber end face is more sensitive to dust and prone to Fresnel reflection, and it is more difficult to improve the return loss performance. Later, the type of connector has been improved, the use of docking the face of the spherical pin (PC), while the external structure has not changed, making the insertion loss and return loss performance has been greatly improved.
(2) SC type optical fiber connector
This is a fiber optic connector developed by Japan's NTT company. Its shell is rectangular, the use of the pin and coupling sleeve structure size and FC type exactly the same, which pin the end of the use of PC or APC-type grinding method; fastening method is to use plug-and-pin type, do not need Rotation of such connectors is cheap, easy plug operation, small fluctuations in interventional losses, high compressive strength, high installation density.
(3) Biconic Connector (Biconic Connector)
The most representative of this type of fiber optic connector was developed by Bell Labs in the United States, which consists of two carefully molded, rounded conical cylindrical plugs and a double- Tube coupling components.
(4) DIN4 type fiber optic connector
This is a connector developed by Germany. This connector uses the pin and coupling sleeve structure size and FC type the same, the end of the use of PC grinding method. Compared with the FC-type connector, its structure to be more complex, the internal metal structure in the control of the pressure of the spring, can avoid the insertion pressure is too large and damage the end face. In addition, the mechanical accuracy of such a connector is high, and thus the insertion loss value is small.http://www.optical-patchcord.com/