FC, SC, ST, LC fiber optic adapters


There are many types of fiber optic adapters, and the leaders of various interfaces that we commonly use are dazzling. How can we quickly identify those connectors?


Fiber Adapter

This time we list the common FC, SC, LC, ST interfaces for everyone to identify


SC interface: blue generous mouth

Its shell is rectangular, and the structure and dimensions of the pins and coupling sleeves used are exactly the same as those of the FC type. Among them, the end face of the pin is mostly PC or APC type grinding method; the fastening method is a plug-in latch type, without rotation. Equipped with metal shrapnel, it is convenient for concealed installation. This type of connector is inexpensive, easy to plug and unplug, small fluctuation in insertion loss, high compressive strength, and high installation density.


FC interface, circular thread interface

The external reinforcement method is a metal sleeve, and the fastening method is a turnbuckle. FC type connector, using the mating end of ceramic pins. Such connectors are simple in structure, easy to operate, and easy to manufacture, but the fiber ends are more sensitive to dust, and are prone to Fresnel reflections, making it difficult to improve return loss performance. Later, this type of connector was improved, and the contact pin (PC) with spherical end face was adopted, and the external structure was not changed, so that the performance of insertion loss and return loss was greatly improved.

fc lc

ST interface, round with snap

It is a snap-on locking structure with a key to ensure accurate centering during connection, with strong tensile strength, metal key positioning, improve the repeatability and durability of the adapter, and use precise ceramic or copper sleeves to ensure Long-term stable mechanical and optical properties. Rectangular structure, easy to install and use by tapping and riveting.


LC interface: blue small square mouth

Made with an easy-to-use modular jack (RJ) latch mechanism. The size of the pins and sleeves used is small, and the density of the optical fiber connectors in the optical fiber distribution frame is improved. Precision ceramic sleeves are used to ensure long-term stable mechanical and optical performance.



Jumpers are generally connected to optical transceivers, transceivers, optical fiber boxes, etc. The interfaces of the two devices must be unified before they can be paired. Therefore, you need to understand the interface before buying. There are too many of these products on the market.


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