What are some common fiber optic connectors?
(1) FC fiber optic connector
This connector was first developed by Japan's NTT.FC is the abbreviation of FERRULECONNECTOR, which indicates that the external reinforcing mode is metal sleeve and fastening mode is screw buckle.The earliest, FC type connectors used ceramic pins on the butt end.This kind of connector is simple in structure, convenient in operation and easy to make, but the optical fiber end is sensitive to dust and easy to produce Fresnel reflection, so it is difficult to improve the return loss performance.Later, this type of connector was improved by adopting a PC with spherical butt end surface, and the external structure was unchanged, which greatly improved the performance of insertion loss and return loss.
(2) SC fiber optic connector
This is a fiber optic connector developed by the Japanese company NTT.The shell is rectangular, and the structure size of pin and coupling sleeve is exactly the same as FC type.The end face of the pin is usually PC or APC type grinding.The fastening method adopts the latch type of plug and bolt, without rotation.This kind of connector has the advantages of low price, convenient operation, low interference loss fluctuation, high compressive strength and high installation density.ST and SC interfaces are two types of fiber optic connectors. For 10base-f connections, the connector is usually of ST type, and for 100base-fx, the connector is mostly of SC type.The core of ST connector is exposed, and the core of SC connector is in the connector.
(3) biconical connector
The most representative product of this kind of optical fiber connector is developed by bell laboratories in the United States. It consists of two tapered cylinder plugs with truncated ends and a coupling assembly with double tapered plastic sleeve inside.
(4) DIN47256 optical fiber connector
This is a connector developed in Germany.The structure size of pin and coupling sleeve used in this connector is the same as FC type, and the end face is processed by PC grinding.Compared with FC connector, its structure is more complex. There is a spring controlling the pressure in the internal metal structure, which can avoid damaging the end face due to too much pressure in the connector.In addition, the mechanical precision of the connector is higher, so the interference loss is smaller.
(5) mt-rj connector
MT - RJ started in MT connectors, NTT to develop with RJ - 45 LAN electric connector of the same latch mechanism, by installing in small casing on both sides of the guide pin on the optical fiber, to facilitate connected to the optical transceiver, double core of fiber-optic connector end face (0.75 MM) between alignment design, is mainly used for data transmission for the next generation of high density optical fiber connector.
(6) LC connector
LC connector is developed by the famous BELL institute, which adopts the modular jack (RJ) latch mechanism.The size of the pin and sleeve used is 1.25MM, half the size of ordinary SC, FC, etc.This can improve the density of fiber optic connector in fiber distribution frame.At present, LC connectors have actually occupied the dominant position in the single mode SFF, and the application of multi-mode is also growing rapidly.
(7) MU connector
MU (MINIATUREUNITCOUPLING) connector is the world's smallest single-core optical fiber connector, which is based on the most commonly used SC connector, developed by NTT.The connector USES a 1.25mm diameter casing and a self-retaining mechanism, which has the advantage of high density installation.NTT has developed the MU connector family using MU's L.25MM diameter casing.They have socket connectors (mu-a series) for optical cable connections;Baseplate connector with self-retaining mechanism (mu-b series) and simplified socket for connecting LD/PD module with plug (mu-sr series), etc.With the rapid development of optical fiber network to the direction of larger bandwidth and larger capacity and the wide application of DWDM technology, the demand for MU connector will also grow rapidly.