- Mar 26, 2022-

General structure

The main purpose of fiber optic connectors is to connect optical fibers. Optical fiber connectors, which have been widely used in optical fiber communication systems, have many types and different structures. However, upon closer inspection, the basic structure of various types of fiber optic connectors is the same, that is, most fiber optic connectors are generally realized by high-precision components (composed of two pins and a coupling tube). Alignment of optical fibers.

In this method, the optical fiber is inserted and fixed in the ferrule, and after the surface of the ferrule is polished, alignment is achieved in the coupling tube. The outer components of the pins are made of metal or non-metal materials. The butt end of the ferrule must be ground, and the other end usually uses a bend limiting member to support the fiber or fiber optic cable to relieve stress. The coupling tube is generally made of two-half synthetic and fastened cylindrical members made of ceramic, bronze, etc., and is mostly equipped with a metal or plastic flange to facilitate the installation and fixation of the connector. In order to align the fibers as precisely as possible, the processing precision of the pins and coupling tubes is very high.

Performance

The performance of the optical fiber connector, first of all, the optical performance, in addition to the interchangeability, repeatability, tensile strength, temperature, and insertion and removal times of the optical fiber connector.

(1) Optical performance: The requirements for the optical performance of optical fiber connectors are mainly the two most basic parameters of insertion loss and return loss.

Insertion loss is a connection loss, which refers to the loss of the effective optical power of the link caused by the introduction of the connector. The smaller the insertion loss, the better, and the general requirement should be no more than 0.5dB.

Return loss refers to the ability of the connector to suppress the reflection of the optical power of the link, and its typical value should not be less than 25dB. In the practical application of the connector, the surface of the pin has been specially polished, which can make the return loss larger, generally not less than 45dB.

(2) Interchangeability and repeatability

The optical fiber connector

The optical fiber connector

Optical fiber connectors are generally passive devices. For the same type of optical fiber connectors, they can generally be used in any combination and can be used repeatedly. The additional loss introduced by this is generally within the range of less than 0.2dB.

(3) Tensile strength

For a well-made fiber optic connector, it is generally required that its tensile strength should not be less than 90N.

(4) Temperature

As a general requirement, fiber optic connectors must be able to be used normally at a temperature of -40oC~+70oC.

(5) times of plugging and unplugging

The fiber optic connectors used can basically be plugged and unplugged more than 1000 times.

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