Semiconductor Optical Amplifiers (SOAs) are devices that amplify optical signals using semiconductor materials. They work by injecting electrical current into the semiconductor, which stimulates the emission of light, thereby boosting the intensity of incoming optical signals. SOAs are commonly used in fiber optic communication systems to enhance signal strength over long distances. These amplifiers are compact and can be integrated into various optical networks, making them versatile for applications like telecommunications and data centers. SOAs can operate over a wide range of wavelengths, allowing them to support different types of optical signals and improve overall system performance.