Abstract: An optical fiber (20) includes a silica-based core (22) which is operative to transmit light and is surrounded by a silica-based cladding (24) having a lower index of refraction than the core (22). A primary coating (26) surrounds cladding (24), and a secondary coating (28) surrounds primary coating (26). Optical fiber ribbon (40) includes a ribbon matrix material (42) which surrounds a plurality of optical fibers (20). Primary coating (26) comprises a photinitiator which has a peak absorbance in a relatively short wavelength UV spectrum. Secondary coating (28) comprises a photinitiator which has a peak absorbance in a relatively long wavelength UV spectrum.