How to Identify Various Fiber Interface Types

The optical fiber connector

(1) FC connector: The external reinforcement method is a metal sleeve, and the fastening method is a turnbuckle. Generally used on the ODF side (the most used on the patch panel).

(2) ST connector: the connector for connecting the GBIC optical module, its shell is rectangular, and the fastening method is the plug-in type, which does not need to be rotated. (Most used on router switches).

(3) SC connector: commonly used in optical fiber distribution frame, the outer shell is round, and the fastening method is turnbuckle. (For 10Base-F connections, the connectors are usually ST type. Often used in fiber optic distribution frames).

(4) LC connector: a connector for connecting SFP modules, which is made with a modular jack (RJ) latch mechanism that is easy to operate. (Commonly used by routers).

(6) MT-RJ connector: a dual-fiber transceiver (commonly used as fiber to the desktop).

Pigtail connector meaning

In the annotations representing pigtail connectors, we often see "FC/PC", "SC/PC", etc. The meanings are as follows:

(1) The front part of "/" indicates the connector model of the pigtail.

(2) The "SC" joint is a standard square joint, which is made of engineering plastics, which has the advantages of high temperature resistance and not easy to be oxidized. The optical interface on the side of the transmission equipment generally uses the SC connector.

(3) The "LC" connector is similar in shape to the SC connector, and is smaller than the SC connector.

(4) The "FC" joint is a metal joint, which is generally used on the ODF side. The number of pluggable and unpluggable metal joints is more than that of plastic.

There are many varieties of connectors. In addition to the three types described above, there are MTRJ, ST, MU, etc.

(5) "/" indicates the cross-section process of the optical fiber connector, that is, the grinding method.

The difference between multimode and singlemode

Identification of fiber single-mode and multi-mode:

L: means single mode, wavelength 1310 nanometers;

LH: Indicates single-mode long distance, wavelength 1310 nm, 1550 nm;

SM: means multi-mode, with a wavelength of 850 nanometers;

SX/LH: Indicates that single-mode or multi-mode fiber can be used;

The transmission distance of single-mode fiber is longer than that of multi-mode fiber.

.(1) Both single-mode fiber and multi-mode fiber are used for long-distance high-quality transmission of network signals. The reason for distinguishing between single-mode and multi-mode is based on the way light propagates inside it; light in a single-mode fiber propagates along a straight line without reflection, so its propagation distance is very long. The multimode fiber can carry the transmission of multiple optical signals

(2) From the perspective of external light, the most conventional method of distinguishing is: the yellow optical fiber is generally a single-mode fiber, and the orange-red or gray optical fiber is generally a multi-mode fiber. The difference between the two in the cable core is that the multimode cable core size is 50.0μm and 62.5μm; while the single mode is 9.0μm (micron).

Note: Generally, multi-mode interconnection is used inside the computer room, and single-mode interconnection is used across regions.

The role of pigtails

The function of the pigtail is mainly used to connect the connectors at both ends of the optical fiber. One end of the pigtail is spliced ​​with the optical fiber connector, and the other end is connected to the optical fiber transceiver or optical fiber module through special connectors (FC, SC, LC, ST) to form optical data transmission. path. Among them, FC and FC connectors are generally used in communication transmission equipment.