QS Vlaknova optika a.s. has developed a new technology for application of an optical antireflection coating to the surface of fiber optic components (e.g. connector ferrules, lenses, fiber optic arrays etc.) to reduce unwanted back reflections of transferred optical signal. Thanks to the newly developed technology SQS may design and manufacture special fiber optic connector interfaces operating over defined wavelength range capable of transferring high-power signals with low reflectivity. Moreover, by applying the antireflection coating to polarization maintaining (PM) optical fiber assemblies, SQS may guarantee not only current excellent value of polarization extinction ratio (PER) but also an excellent value of back reflection which makes them predisposed to the most demanding applications, e.g. in sensor technology.