Here are some of the more common fiber connectors: (1) […]
Here are some of the more common fiber connectors:
(1) FC type optical fiber connector
This connector was first developed by NTT Japan. FC is the abbreviation of FERRULE CONNECTOR, which indicates that the external reinforcement method is a metal sleeve and the fastening method is a turnbuckle. The earliest, FC type connector used was the mating end of the ceramic pin. The connector has the advantages of simple structure, convenient operation and easy manufacture, but the fiber end face is sensitive to fine dust, and Fresnel reflection is easy to occur, and it is difficult to improve the return loss performance. Later, this type of connector was improved by using a pin (PC) with a spherical end face, and the external structure was not changed, so that the insertion loss and return loss performance were greatly improved.
(2) SC type optical fiber connector
This is a fiber optic connector developed by NTT Corporation of Japan. The housing is rectangular in shape, and the pin and coupling sleeve are identical in size to the FC type. The end face of the pin is mostly made of PC or APC type grinding method; the fastening method is the plug-and-pin type, which does not need to be rotated. Such connectors are inexpensive, easy to insert and remove, have small fluctuations in insertion loss, high compressive strength, and high installation density.
The ST and SC interfaces are two types of fiber optic connectors. For 10BASE-F connections, the connectors are typically ST type. For 100BASE-FX, the connectors are mostly SC type. The core of the ST connector is exposed and the core of the SC connector is inside the connector.
(3) Double cone connector
The most representative of these types of fiber optic connectors was developed by Bell Laboratories of the United States. It consists of two precision-molded ends with frusto-conical cylindrical plugs and a double-conical plastic sleeve inside. The coupling assembly of the barrel.
(4) DIN47256 fiber optic connector
This is a connector developed by Germany. The connector and coupling sleeve of this type of connector have the same structural dimensions as the FC type, and the end face treatment adopts PC grinding. Compared with the FC type connector, the structure is more complicated, and the internal metal structure has a spring that controls the pressure, so as to avoid damage to the end surface due to excessive insertion pressure. In addition, the mechanical accuracy of such a connector is high, and the value of the insertion loss is small.
(5) MT-RJ type connector
MT-RJ started with the MT connector developed by NTT, with the same latching mechanism as the RJ-45 LAN electrical connector. The optical fiber is aligned with the guide pin mounted on both sides of the small sleeve for easy transmission and reception. Connected to the machine, the connector end face fiber is a two-core (interval 0.75MM) array design, which is the next generation high-density fiber optic connector mainly used for data transmission.
(6) LC type connector
The LC connector was developed by the famous BELL Institute and is manufactured using a convenient modular jack (RJ) latch mechanism. The size of the pins and sleeves used is half that of ordinary SC, FC, etc., and is 1.25 mm. This can increase the density of the fiber optic connectors in the fiber distribution frame. At present, in the single-mode SFF, the LC type connector has actually occupied a dominant position, and the application in multi-mode has also grown rapidly.
(7) MU type connector
The MU (MINIATURE UNIT COUPLING) connector is the world's smallest single-core fiber optic connector developed by NTT based on the most widely used SC-type connector. The connector features a 1.25 mm diameter bushing and self-retaining mechanism with the advantage of enabling high density mounting. Using MU's L.25MM diameter bushings, NTT has developed a series of MU connectors. They have socket type connectors for fiber optic cable connections (MU-A series); backplane connectors with self-holding mechanism (MU-B series) and simplified sockets for connecting LD/PD modules and plugs (MU-SR series) Wait. With the rapid development of fiber-optic networks to larger bandwidths and larger capacity and the widespread use of DWDM technology, the demand for MU-type connectors will also grow rapidly.