Optical amplifiers are devices that boost the strength of optical signals, which are used in fiber optic communication systems. They work by amplifying light signals without converting them into electrical signals, allowing for longer transmission distances and improved signal quality. Common types of optical amplifiers include Erbium-Doped Fiber Amplifiers (EDFAs) and Semiconductor Optical Amplifiers (SOAs). These amplifiers are essential in modern telecommunications, as they help maintain the integrity of data over long distances. By increasing the power of the light signals, optical amplifiers reduce the need for frequent signal regeneration, making communication systems more efficient and cost-effective.