Active polarization is a technique used in various fields, including telecommunications and optics, to control the polarization state of light. It involves the use of devices, such as liquid crystal displays or electro-optic modulators, which can dynamically change the polarization of light waves in response to an external signal or electric field. This method is particularly useful in applications like 3D displays and optical communication systems, where precise control over light polarization can enhance performance and improve image quality. By actively adjusting the polarization, systems can reduce interference and increase data transmission efficiency.