The geometric properties (diameter, ovality) are controlled during the draw process. After drawing optical fibers are tested to verify all other properties are within the specification.
These properties can include any of the following: attenuation, macrobend attenuation, cutoff wavelength, mode field diameter, dispersion, polarization mode dispersion, tensile proof test, glass geometry (curl, cladding diameter, core-clad concentricity, & cladding non-circularity), and coating geometry (coating diameter & coating-cladding concentricity).
In single mode production, the first test typically is a strength test. Then Optical properties like attenuation are measured. For the next process steps, fibers are cut to predefined length.
If a cable contains multiple fibers, they usually have received an additional color coating to allow for easier identification. To color code and mark the optical fibers, UV curing paints are applied and cured within seconds with UV radiation. Take advantage of the Heraeus UV experts to select the right UV solution tailored to your process.
Also typically a cabled fiber gets a connector at both ends and the end faces are polished. For other applications several fibers are fixed together in one connector to create a flexible fiber bundle.
Contact our Heraeus UV experts