What are the more common types of fiber optic connectors?

Fiber optic connector types can be divided into single-mode fiber optic connectors and multi-mode fiber optic connectors according to the different transmission media; according to the different structures can be divided into FC, SC, ST, D4, DIN, Biconic, MU, LC, MT and other types; according to the connector pin end face can be divided into PC (UPC) and APC; according to the number of fiber optic cores, there is a single-core, multi-core points.

-I. What are the more common types of fiber optic connectors? 1, FC fiber optic connectors: this connector was first developed by Japan NTT. FC is the abbreviation of FerruleConnector, indicating that its external reinforcement is the use of a metal sleeve, the fastening method for the screw buckle. The earliest, FC type of connector, the use of ceramic pins on the butt face is a flat contact (FC). This type of connector structure is simple, easy to operate, easy to produce, but the fiber optic end face is more sensitive to microdust, and easy to produce Fresnel reflection, to improve the return loss performance is more difficult. Later, the type of connector to make improvements, the use of butt end face is a spherical pin (PC), while the external structure has not changed, so that the insertion loss and return loss performance has improved substantially. 2, SC-type fiber optic connector: This is a fiber optic connector developed by Japan's NTT Corporation. Its shell is rectangular, the pin and coupling sleeve used in the structure of the dimensions and FC-type identical, which pin end face more PC or APC-type grinding method; fastening method is used to plug the pin latch type, without rotation. Such connectors are inexpensive, easy to plug and unplug the operation, intervening loss fluctuations, high compressive strength, high installation density (router switches on the most used).3, ST-type fiber optic connectors: commonly used in fiber optic distribution frame, the shell is round, the fastening method for the screw buckle. (For 10base-F connection, the connector is usually ST type. Commonly used in fiber optic distribution frame) 4, LC-type fiber optic connectors: LC-type connector is Bell Institute research and development, using easy-to-operate modular jack (RJ) latch mechanism made. The size of the pins and sleeves used is ordinary SC, FC and other dimensions of half the size of 1.25 mm, so that you can improve the density of fiber optic connectors in the optical distribution frame. At present, in the single-mode SFF, LC type of connector has actually occupied a dominant position in the multi-mode applications are also growing rapidly. 5, biconical connector (Biconic Connector): This type of fiber optic connector in the most representative products developed by the U.S. Bell Labs development, which consists of two precision molded end of the truncated conical cylindrical plug and an internal biconical plastic sleeve. Internally equipped with a double conical plastic sleeve coupling components. 6, DIN4-type fiber optic connectors: This is a connector developed by Germany. This connector uses the pin and coupling sleeve structure size and FC-type the same, the end face processing using PC grinding. Compared with the FC-type connector, its structure is a little more complex, the internal metal structure of the spring to control the pressure, you can avoid damage to the end face due to excessive mating pressure. In addition, the connector's mechanical precision is higher, thus intervening in the loss value is smaller. 7, MT-RJ type connector: MT-RJ started in NTT development of MT connectors, with RJ-45 type LAN electrical connector with the same latch mechanism, through the installation of a small casing on both sides of the guide pin aligned to the fiber optic, in order to facilitate the connection with the optical transceiver, the connector end of the optical fiber for the two-core (spacing) 0.75mm) arrangement design, is mainly used for data transmission of the next generation of high-density optical connectors. 8, MU-type connector: MU connector is currently the most used SC-type connector based on the development of the world's smallest single-core fiber optic connector developed by NTT, the connector using a 1.25mm diameter sleeve and self-holding mechanism, the advantage of which is that it can achieve high-density installation. Utilizing the MU's l.25mm diameter sleeve, NTT has developed a series of MU connectors. They include socket-type optical connectors (MU-A series) for fiber optic cable connections, baseboard connectors (MU-B series) with a self-holding mechanism, and simplified sockets (MU-SR series) for connecting LD/PD modules to plugs. With the rapid development of fiber optic networks toward greater bandwidth and capacity and the wide application of DWDM technology, the demand for MU-type connectors will also grow rapidly.

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