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What is Fiber Optic Adapter?

What is Fiber Optic Adapter?

Fiber optic adapters (also known as Fiber couplers, Fiber Adapter ) are designed to connect two optical cables together. They have a single fiber connector (simplex), dual fiber connector (duplex) or sometimes four fiber connector (quad) versions. The optical fiber adapter can be inserted into different types of optical connectors at both ends of the optical fiber adapter to realize the conversion between different interfaces such as FC, SC, ST, LC, MTRJ, MPO and E2000, and is widely used in optical fiber distribution frames (ODFs) Instruments, providing superior, stable and reliable performance.

Features of Fiber Optic Adapter

The optical fibers are connected by an adapter through its internal open bushing to ensure the maximum connection between the optical connectors. In order to be fixed in a variety of panels, the industry also designed a variety of finely fixed flange.

Transformable optical adapters are available with fiber optic connectors of different interface types on both ends and provide a connection between APC faceplates. Duplex or multi-adapter adapts to increase installation density and save space.

Fiber Optic Adapter types

FC Fiber Optic Adapter

This fiber optic adapter was first developed by Japan NTT. FC is an acronym for FERRULE CONNECTOR, indicating that its external reinforcement is the use of the metal sleeve, fastening the way for the buckle. The earliest, FC type connector, the docking end of the ceramic pin. Such connectors are simple in structure, easy to operate and easy to manufacture. However, the fiber end face is more sensitive to dust, and it is easy to produce Fresnel reflection and it is difficult to improve the return loss performance. Later, this type of connector has been improved, the use of docking the spherical end of the pin (PC), while the external structure has not changed, making the insertion loss and return loss performance has been greatly improved.

SC Fiber Optic Adapter

This is a kind of optical fiber connector developed by Japan NTT Corporation. The shell is rectangular, the pin and the coupling sleeve used in the structure of the same size and FC type. One end of the pin to use more PC or APC grinding method; the casting method is the use of plug pin type, without rotation. Such connectors are inexpensive, easy to plug and unplug, low insertion loss variations, high compressive strength, and high installation density.

LC Fiber Optic Adapter

The lc-type connector is a well-known BELL (Bell) Institute of research and development, the use of convenient modular jack (RJ) latch mechanism made. The pins and sleeves used are half the sizes used for normal SC, FC, etc., at 1.25mm. This will increase the density of fiber optic connectors in fiber distribution frames. Currently, in the single-mode SFF, LC type of connector has actually occupied the dominant position, the application of multi-mode is also growing rapidly.

MTP/MPO Fiber Optic Adapters

Unlike the single-core SC fiber optic adapters, the SC fiber optic adapters are internally equipped with a ceramic ferrule that is precisely aligned through the ferrule when the SC connector ferrule is connected, while the MPO / MTP adapter is connected using an MPO / MTP Precise connection of two guide holes with a diameter of 0.7mm and a guide pin on the left and right ends of the ferrule. MPO / MTP adapters are widely used in communication system base stations, optical fiber distribution frames (ODFs) in building rooms, MPO / MTP cassette module, and various test instruments.

How to choose a fiber optic adapter?

Due to the wide variety of fiber optic adapters and the similar appearance of fiber optic adapters from different vendors, you may not know how to choose. In general, you should consider the following two tips when choosing a fiber optic adapter.

Fiber Cable Type

If the fiber adapter needs to be connected to the same fiber cable type and connector, a fiber optic adapter with a square, rectangular or circular interface can be used. If the type of cable to be connected is different, a hybrid fiber adapter is required. This hybrid fiber adapter can connect any two types of fiber patch cords together. Due to the wide variety of hybrid fiber optic adapters, it is important to know what type of cable to connect before purchasing.

The Sleeve Material of fiber adapter 

Alignment sleeve is the most important component of fiber optic adapters. Some manufacturers choose metal as the material for the alignment bushings, but ceramic-made fiber optic adapters have proven to work much better than using metal as the alignment bushing. The fiber optic adapter, because the crystal structure of the ceramic is very hard and does not deform over time like metal, so it can achieve fast alignment and high-precision fiber end-face connection.


How to Cleaning Fiber Optic Adapter?

Although the fiber optic adapter is relatively small and belongs to the small part of the fiber optic cabling, it does not affect its importance in the fiber optic cabling system. Like other fiber optic equipment, it needs to be cleaned. There are two main cleaning methods, namely contact and non-contact cleaning.

Contact cleaning method 

(1) Dust-free wiping paper or dust-free cleaning cloth; use dust-free paper or dust-free cloth with sewage alcohol to wipe the end face of the fiber optic connector. 

(2) Cassette type optical fiber cleaning box; a special role of wiping tape is installed in the rollable casing, and the principle is to use the strong adhesive on the wiping tape to stick the dirt on the end face of the fiber connector. 

(3) Special fiber cleaning pen; fiber-optic cleaning pen is specially used to clean the inside of the fiber adapter or the ferrule end face. The method is very simple. The end of the refill is inserted into the ceramic sleeve of the adapter and can be cleaned by a single push. End face.

Non-contact cleaning method 

(1) Ultrasonic cleaning method Nowadays, the ultrasonic cleaning instrument on the market adopts this cleaning method, and the cleaning liquid is turned into an ultrasonic “liquid column” to be sent out to the end face of the fiber connector. 

(2) High-pressure air blowing method; the cleaning liquid is shown on the end face of the fiber connector, and then the high-pressure gas is used to align the end face of the connector to clean the end face.