What does DWDM stand for in optical networks?

• A. Distress Wireless Data Management
• B. Dense Wavelength Division Multiplexing
• C. Direct Waveform Digital Modulation
• D. Dynamic Wavelength Division Multiplexing

Answer: (D)

DWDM stands for Dense Wavelength Division Multiplexing. In optical networks, this technique carries many separate data streams on a single fiber by using different wavelengths (colors) of light for each stream. Because the wavelengths are spaced closely together—dense—they can fit a large number of channels within the same fiber bandwidth, greatly increasing total capacity. Transmitters multiplex these wavelengths onto one fiber, and receivers demultiplex them to recover each channel. Achieving dense spacing relies on precise filtering and typically follows standardized ITU grids (like 50 GHz or 100 GHz). Long-distance links use optical amplifiers to boost signals along the way without converting them to electrical form. The other options don’t reflect the standard term used in optical networking.