What are the advantages of low loss fiber optic connectors

What are the advantages of low-loss fiber optic connectors? What are the requirements for low-loss fiber optic connectors? Let's take a look at the relevant characteristics of low-loss fiber optic connectors.

Low-loss fiber optic connector: 10 connectors are matched with each other. The maximum insertion loss is not more than 0.2dB, and the typical insertion loss is less than 0.12dB. The connection loss of fiber optic connector activities in the link is mainly caused by several aspects: the optical transmission part (fiber Core) lateral mismatch, longitudinal mismatch, axial mismatch, etc. The most dominant contributor to insertion loss (IL) is lateral mismatch. Loss is caused when two fiber optic connector pairs with non-concentric cores are mated.

IEC Standard Requirements for Horizontal Adaptation

Solutions for Lateral Mismatch

Solution

Control the concentricity of the connector and the method of controlling the concentricity of the connector

1. Select the ceramic ferrule with very good concentricity and very small inner hole diameter.

2. Adjust the eccentric direction of the connector with unsatisfactory concentricity to the same direction

3. By controlling the roundness of the inner hole of the ceramic ferrule, the performance of the connector can also be guaranteed to a certain extent

Low Loss Fiber Test Results

In the experiment, the insertion loss IL=4.8dB of 10 optical fiber connectors that have not been aligned in series, and the insertion loss IL=0.8dB of each optical fiber connector after alignment.

Product interoperability test comparison

Using manual core alignment and automatic machine, select 10 jumpers each for K adjustment and inter-match test IL.1310 and 1550 each have 180 sets of data.

Solution

Control the 3D indicators of fiber optic connectors:

It can effectively control the gap between the optical fiber surfaces when the optical fiber connectors are mated by detecting the curvature radius, vertex offset and optical fiber height of the connector

The axial matching mainly comes from the ferrule and the fiber itself

For qualified ferrules and optical fibers, the loss of optical performance caused by axial mismatch is negligible

Effect of End Surface Finish

End-face finish is the factor that most affects the performance of the connector loss besides the mismatch of the fiber optic connector itself:

1. Oil stains, dirt, fingerprints and other external dirt

2. Spots and depressions on the connector

3. Scratches on the connector

Analyze the connector through the end face detection equipment to ensure the smoothness of the connector end face

Manufacturing method of low-loss optical fiber connector

1. First, ensure that the connector ferrule used for production has good concentricity and inner hole roundness

2. During the production process, use point-adjusting equipment to adjust the eccentric direction to be consistent, and assemble according to the adjusted direction

3. Ensure the three-dimensional index and surface finish of the end face during the grinding process

4.Use high-definition end-face detection products to ensure the surface finish of the connector