Our services include developing and characterizing polarization compensation systems and their components for various link architectures, wavelengths, and applications. We provide testing, and bench-marking polarization compensation systems utilizing polarization-entangled photons, and offering polarization compensation solutions for various application domains, including amongst others free space and fiber optic transmission of light. Application: • Characterization of free-space and fiber-optic polarization manipulation devices for different wavelength ranges with regards to speed, precision, hysteresis, linearity, and range; • Typical wavelength ranges: telecom C-band and O-band, 780-650nm, others possible; • Testing and bench-marking of polarization compensation systems on emulated links and physical optic fiber infrastructure for free-space and fiber-optic light transmission; • Development of fast and reliable polarization compensation solutions based on: - Polarization entanglement (non-local compensation for interruption-free QKD), - Polarization reference (time and wavelength multiplexing).