Low loss fiber optic connector

Low loss Fiber Optic Connector requirements

●Low-loss Fiber Connector: 10 connectors match each other with a maximum insertion loss of no more than 0.2dB, and a typical insertion loss of less than 0.12dB. The connection loss of the fiber optic connector in the link is mainly caused by several aspects: the light transmission part ( Core core) lateral mismatch, longitudinal mismatch, axial mismatch, etc. The most important factor causing insertion loss (IL) is lateral mismatch. Loss occurs when two fiber cores of different cores are docked.

IEC standard requirements for lateral adaptation

Solutions for lateral mismatch

●Solution

Method of controlling connector concentricity and controlling connector concentricity

1. Use ceramic ferrules with very good concentricity and very small inner 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 be guaranteed to a certain extent.

Low loss fiber test results

In the experiment, the access loss of the 10 fiber optic connectors without the alignment is IL=4.8dB, and the access loss of each fiber connector after the core adjustment is IL=0.8dB.

Product compatibility test comparison

Using manual adjustment and automatic machine, each selected 10 jumpers for K adjustment and mutual compatibility test IL.1310 and 1550 each have 180 sets of data.

Product compatibility performance comparison

●Solution

Control the 3D metrics of the fiber optic connector:

It can effectively control the gap between the fiber surfaces when the fiber connector is docked by detecting the radius of curvature, the vertex offset and the fiber height of the connector.

●Axial matching mainly comes from the ferrule and the fiber itself.

●All qualified ferrules and optical fibers, the optical performance loss caused by the axial mismatch is negligible

End surface finish

• End face finish is an element that has the greatest impact on connector loss in addition to the mismatch of the fiber optic connector itself:

1, oil stains, dirt, fingerprints, etc.

2, spots, depressions on the connector

3, scratches on the connector

● Analyze the connector through the end face detection device to ensure the connector end surface finish

Low loss fiber optic connector manufacturing method

1, first ensure that the connector ferrule for production has better concentricity and inner hole roundness

2. Adjust the eccentric direction to be consistent using the point adjustment device during the production process, and assemble according to the adjustment direction.

3, to ensure the three-dimensional index and surface finish of the end face during the grinding process

4, using high-definition end-face inspection products to ensure the surface finish of the connector