What are the common fiber optic interfaces


As we all know, there are four common types of fiber optic interfaces. They are standards developed by different companies in the early days. The effect is actually the same, but each has its own advantages and disadvantages. So, what are the common optical fiber interfaces? This is for everyone.


Introduction to Optical Fiber Interface

What are the common fiber optic interfaces

ST, SC connector joints are often used in general networks. After the ST head is inserted, it is fixed with a bayonet in half a circle, but the disadvantage is that it is easy to break; the SC connector is directly inserted and unplugged, which is very convenient to use, but the disadvantage is that it is easy to fall out; It is reliable and dust-proof, but the disadvantage is that the installation time is slightly longer.


There are also many types of optical fiber connectors, that is, optical fiber connectors that connect to optical modules, and they cannot be used with each other. People who are not in frequent contact with optical fibers may mistakenly think that the optical fiber connectors of GBIC and SFP modules are the same kind, but they are not. The SFP module is connected to the LC fiber optic connector, while the GBIC is connected to the SC fiber optic fiber connector. The following is a detailed description of several commonly used optical fiber connectors in network engineering:

①FC type fiber optic connector: The external strengthening 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)


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


③ST type optical fiber 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)

lc lc

④LC-type fiber optic 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)


⑤MT-RJ: A square fiber optic connector with integrated transceiver, one dual fiber transceiver integrated.


Introduction of various fiber optic interface types

FC round with thread (the most used on the patch panel)

ST snap-on round

SC card connection type (the most used on router switches)

PC microsphere grinding and polishing

APC is at an 8-degree angle and is micro-spherical grinding and polishing

MT-RJ square, one dual fiber transceiver (useful for Huawei 8850)


Introduction to common optical fiber interfaces

fiber optic connector

FC round with thread (the most used on the patch panel)

ST snap-on round

SC card connection type (the most used on router switches)

PC microsphere grinding and polishing

APC is at an 8-degree angle and is micro-spherical grinding and polishing

MT-RJ square, one dual fiber transceiver (useful for Huawei 8850)


Optical fiber module: generally support hot swap, GBICGigaBitrateInterfaceConverter, the optical fiber interface used is mostly SC or ST type

SFP small package GBIC, the fiber used is LC type


Fiber used:

Single mode: L, wavelength 1310 single mode long distance LH wavelength 1310, 1550

Multimode: SM wavelength 850

SX/LH means single mode or multimode fiber can be used

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

The front part of "/" indicates the connector model of the pigtail

The "SC" joint is a standard square joint, 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

The "LC" connector is similar in shape to the SC connector and is smaller than the SC connector.

The "FC" connector is a metal connector, which is generally used on the ODF side. The metal connector can be plugged more frequently than plastic.


There are many types of connectors. In addition to the three types described above, there are MTRJ, ST, MU, etc. The specific appearance is shown below.

This topic is related as follows:

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


"PC" is most widely used in telecom operators' equipment, and its connector section is flat.


The attenuation of "UPC" is smaller than that of "PC". It is generally used for equipment with special needs. Some foreign manufacturers use FC/UPC for the internal jumper of the ODF frame, mainly to improve the indicators of the ODF equipment itself.


In addition, the "APC" model is more widely used in radio and television and early CATV. Its pigtail head adopts an inclined end face, which can improve the quality of the TV signal. The main reason is that the TV signal is analog light modulation. When the connector is coupled When the face is vertical, the reflected light returns along the original path. Due to the uneven distribution of the refractive index of the fiber, it will return to the coupling surface again. Although the energy is very small at this time, the noise cannot be completely eliminated by the analog signal, so it is equivalent to superimposing a weak signal with time delay on the original clear signal. The performance on the screen is ghosting. The inclination of the pigtail headband prevents the reflected light from returning along the original path. General digital signals generally do not have this problem.


FC is the abbreviation of FerruleConnector, indicating that its external reinforcement is a metal sleeve, and the fastening method is a turnbuckle


PC is the abbreviation of PhysicalConnection, indicating that its butt end face is in physical contact, that is, the end face is a convex arch structure.


SC(F04) fiber optic connector: molded plug-in coupling single-mode fiber optic connector. Its shell adopts the molding process and is made of molded fiberglass plastic, which is rectangular; the plug sleeve (also called the pin) is made of precision ceramics, and the coupling sleeve is a metal slotted sleeve structure, and its structural size is the same as that of the FC. The same type, the end face treatment adopts PC or APC type grinding method; the fastening method adopts the plug-and-pull type, without rotation. This type of connector is inexpensive, easy to plug and unplug, small fluctuation in insertion loss, high compressive strength, and high installation density.


The above is the introduction of the common optical fiber interfaces that ZR Cable brings to you. I believe you can see all the common optical fiber interfaces here, and hope to bring you some help.


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