Since affect the quality of fiber connector are more factors, and different factors affecting the quality of the connector not the same degree. Here, I will combined with the actual process of production and inspection experience on a variety of factors connector quality defects and corrective measures should be simple analysis for you to explore:
* Polishing is not completely and generated scratches;
When the polishing is not complete, the connector of the core and the coating layer has the long parallel (straight) scratches. The contact-type connectors (such as ST, SC, FC, D4, FDDI, and ESCON, etc.), can be 1um or finer polishing paper type milling was continued to remove the scratches. For non-contact connectors (such as SMA, Biconic and mini-BNC, etc.), may not be able to eliminate it. Of course, for non-contact onnectors, if fewer polishing rough grinding paper, it can adjust the length of the pin and continue grinding scratches can usually be eliminated; if the paper has been polishing in the rough grinding excess, pin length has reached the required value, it can not be polished (eg SMA connector); or regrind works, pin length becomes shorter (eg Biconic connectors), resulting in larger air gap, the result will be loss large.
* Grinding process, grinding paper with dirt;
Polishing paper with dirt and scratches resulting produce is not in place and the grinding scratches appearance is not the same. As a result of scratches and dirt polishing is not in place as compared to produce scratches, generally relatively single, relatively thick, and in the core and coating layers are present. For the use of metal pins or polyester material, can be eliminated by re-polishing of the type scratches; while the ceramic pin, generally not easy to re-grinding.
* In use process produce scratches;
In use process produce scratches, generally it is dot (black spots) or a shorter line. you can use a soft, lint or paper dipped in alcohol to wipe a few fine polishing paper polished to try to eliminate this type of scratches.
* Grinding process, the grinding paper with scratches caused by residual sand;
For some grinding paper, during the grinding process, may be due to the fall of the core sand and abrasive grit residue. The sand can be soft, lint-paper dipped in alcohol wipe, you can also 0.3um or 0.5 um abrasive paper or polishing several times to remove.
* Crack in fiber core
Fiber crack features are: a part of the defective area, and the other area is very good. In cutting fiber protruding head, if the fiber cutter did not adjust the intensity and angle, then it is easy to produce core cracks. This requires us to cut fiber protruding head in strict accordance with the technical requirements when operating.
* Fiber core stained with dust
The connector surface dust is very easy to judge, which is characterized by striking (larger). As long as we stick with a soft lint-paper can be removed by the alcohol wipe the “stain”.
* Cutting fiber excess length without cutting well
In polishing before we cut the fiber protruding head if force too much, it is easy to get off fiber, which requires us according to their own habits and quality – adjusted optical fiber cutter angle and force.
* “Debris” are in fiber core
Appear fiber core “debris” phenomenon, there are three main reasons:
One of the reasons: Epoxy glue is not completely solidified and began grinding. If the epoxy is not completely solidified, they begin to polishing, it will cause the connector pins showing the irregular shape of the face, it looks like a mask like a layer of tulle. We can before grinding, by observing the end face of the connector epoxy color to simply determine whether the adhesive has fully cured.
The second reason: when grinding with colloidal particles stick on the fiber core. This requires that we were fine with coarse abrasive paper and abrasive paper laps milling was continued, under normal circumstances, can reduce or even completely eliminate the symptoms.
The third reason: water damage from grinding or wipe the stains of alcohol pins. We can stick with a soft lint paper pure alcohol to remove water stains, you can also 0.3um or 0.5um abrasive paper gently lapping 3-5 laps.
“Debris” phenomenon by the coarse abrasive paper (12 to 15 microns) and 1 micron polishing paper to remove fine polishing. First, in the rough grinding polishing paper until the magnifier that looks very clear outline of the core. Then use fine abrasive paper grinding. Generally can eliminate or reduce the “debris”.
Above, simply describes how to use a magnifier to check the fiber optic connectors, and combined with the analysis of the inspection results, presented to the existence of various defects fiber optic connectors remedies, all of which are beneficial to us to improve the fiber connectors quality. However, we must bear in mind, in strict accordance with the fiber optic connector assembly process requires the operator, in order to fundamentally improve the quality of fiber optic connectors.