The physical contact between the ferrule ends of a connector is essential to optimum and consistent signal transmission, and requires high-precision polishing. Only the use of high-precision automatic polishing machines can guarantee optimum surface quality.
The polishing stage, in which the ferrule ends are polished using a variety of polishing sheets, sealing pressures and time cycles, is the most complex and challenging step in producing high-quality fibre optic cables. Various polishing processes are necessary depending on the connector type.
For optimum results, the required polishing parameters have been determined for each connector type in extensive testing series:
• Number and duration of polishing cycles
• Hardness of polishing pad per cycle
• Surface roughness of the polishing sheet per cycle
• Connector sealing pressure Quality testing
A video microscope with up to 400x enlargement is used in two-dimensional surface analysis. Automatic fault identification systems find and evaluate the smallest scratches, abrasions, traces of adhesive or contamination. Professional three-dimensional evaluations of ferrule endface geometries are performed using an interferometer.
The device delivers ultra-high-precision measurements of ferrule tip rounding, projections or recesses, and the central positioning of the fibres. All parameters are evaluated to international standards to provide an automatic pass/fail evaluation of the test specimen.