Which technology combines multiple signals at different wavelengths for simultaneous transmission over fiber cables?

The correct answer refers to Coarse Wavelength Division Multiplexing (CWDM), which is a technique used to combine multiple optical signals at different wavelengths for simultaneous transmission over a single fiber optic cable. This method enhances the capacity of fiber networks by allowing multiple data streams to be sent concurrently without interference, each operating on its designated wavelength. This separation of signals ensures efficient use of fiber resources and increases overall bandwidth capacity.

The technology works by utilizing specific wavelength channels, which can be packed closely together. This ability to transmit multiple data channels simultaneously makes CWDM an attractive option for telecommunication providers, particularly in scenarios where high data transmission rates are needed across long distances.

In contrast, other options presented, like Multiplexing Statistical Division and Multiplexing Code Division Multiplexing, do not specifically refer to the wavelength aspect of signal combining over fiber optics. Instead, they represent other multiplexing techniques that focus either on statistical methods or code-based methods, which are not designed for fiber-optic applications in the same way as CWDM.