How does a photodiode function in optical communication?

A photodiode plays a crucial role in optical communication by converting light signals into electrical signals. This process is essential for transmitting information over optical fibers since data is often encoded in light pulses. When light hits the photodiode, it generates electron-hole pairs, leading to an electric current that corresponds to the intensity of the incoming light. This electrical signal can then be processed and interpreted by electronic circuits, allowing for the retrieval of the original data.

The other choices mention functions that do not align with the primary role of a photodiode. For example, photodiodes do not amplify light signals; rather, they detect and convert them. They also do not filter or store light signals; these functions are typically handled by other components in an optical communication system. Filtering may involve specialized optical filters or components that separate different wavelengths, while storage is accomplished through different technologies altogether.