In what scenario would Single Mode Fiber (SMF) be preferred over Multimode Fiber (MMF)?

Single Mode Fiber (SMF) is preferred in scenarios involving long-distance, high-speed data transfers due to its design. SMF has a smaller core diameter compared to Multimode Fiber (MMF), which allows it to carry light signals in a single pathway or mode. This characteristic minimizes modal dispersion, leading to clearer signals over extended distances.

When data needs to travel long distances—such as in telecommunications or inter-customer connections—the long wavelengths used in SMF support higher bandwidths and longer transmission distances without significant signal loss. As a result, SMF is ideal for applications that require fast and reliable data communication over many kilometers, making it the better choice than MMF for these needs.

In contrast, while MMF is suitable for shorter distances and generally less expensive, it is limited in its transmission range and speed capabilities when compared to SMF. Therefore, for long-distance and high-speed applications, SMF is the superior choice.