Wavelength Division Multiplexing (WDM) is a fiber-optic transmission technique that multiplexes multiple optical carrier signals onto a single fiber strand by using different wavelengths (colors) of laser light. It dramatically increases network capacity and efficiency by allowing simultaneous data transmission of 8,10,100+ channels without requiring new fiber infrastructure. WDM acts like a prism, combining multiple data signals (each on a unique wavelength) at the transmitter and separating them at the receiver. It turns a single fiber into multiple "virtual" fibers, enabling enormous bandwidth capacity, often 10Gb/s or 100Gb/s per channel. CWDM(Coarse WDM) is used for shorter distances with fewer channels (typically 8). DWDM(Dense WDM) is used for long-haul, high-capacity transmission, with 40 or more channels. It is essential for data centers, telecommunications, internet service providers, and long-distance submarine cables. It is highly scalable and flexible, often using passive, maintenance-free components. WDM is frequently applied in bidirectional communication over a single fiber, reducing infrastructure costs.
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