What does "WDM" stand for in fiber optics?

Wavelength Division Multiplexing (WDM) is a crucial technology in fiber optics that allows multiple wavelengths of light to be transmitted simultaneously over a single fiber cable. This is accomplished by combining different laser light frequencies, each carrying its own data stream, thereby increasing the capacity of the fiber without the need to install additional cables. WDM takes advantage of the ability of fiber optic cables to carry data over various wavelengths without interference, making it possible to significantly expand the data transmission capabilities of existing fiber networks.

By using WDM, network operators can make more efficient use of their physical infrastructure, reduce costs, and improve the overall bandwidth available to users. This technology is particularly important as the demand for data services continues to grow, enabling internet service providers and telecommunications companies to offer higher-speed services and connect more users.

In contrast, the other options presented do not accurately define the widely used fiber optics technology that WDM represents. They may refer to different concepts or technologies unrelated to the multiplexing methods relevant to fiber optics data transmission.