Infrared optical refers to the use of infrared light in optical systems and devices. Infrared light has a longer wavelength than visible light and is not visible to the human eye. However, it can be detected and utilized in various applications. Infrared optical technology is commonly used in fields such as telecommunications, remote sensing, and thermal imaging. In telecommunications, infrared optical signals can be used for wireless communication, especially in short-range applications like infrared data transmission between devices. In remote sensing, infrared optical sensors are used to collect data from the Earth's surface, atmosphere, and oceans. This data can be used to study weather patterns, monitor environmental conditions, and detect objects or phenomena that are not visible in visible light.