WDM (Wavelength Division Multiplexing)

Wavelength Division Multiplexing (WDM) is a technology that combines multiple data signals onto a single fiber optic cable by using different wavelengths (colors) of light for each signal. Think of it like a multi-lane highway, where each lane carries a different type of traffic. This allows many signals—such as internet, phone, and TV data—to travel simultaneously through one cable, dramatically increasing capacity and efficiency. At the receiving end, the signals are separated back into their original forms, enabling high-speed, large-volume data transmission over long distances with minimal interference.