Single-Mode Fiber (SMF) has a very narrow core, typically 8–10 µm, allowing only a single light propagation path or mode. This design minimizes modal dispersion, ensuring that light pulses travel the same distance and arrive simultaneously at the receiver. SMF uses laser diodes as light sources and operates at wavelengths such as 1310 nm, 1490 nm, or 1550 nm. Its low attenuation and high coherence make it ideal for long-distance transmission and high-precision sensing applications, such as Distributed Acoustic Sensing (DAS), Distributed Temperature Sensing (DTS), and Distributed Strain and Temperature Sensing (DTSS), where accurate event localization is critical (±1 m typical) . Multi-Mode Fiber (MMF) has a larger core, typically 50 µm or 62.5 µm, supporting multiple light paths simultaneously. This introduces modal dispersion, where different light modes travel varying distances, causing pulse spreading and signal degradation over longer distances. MMF uses LEDs or VCSELs as light sources and operates at 850 nm or 1300 nm wavelengths. It is best suited for short-range applications, such as data centers, LANs, or indoor perimeter monitoring, offering strong localized sensitivity and simpler installation at a lower cost .
In fiber optic sensing, both SMF and MMF can detect physical changes along the fiber by analyzing backscattered light. When a coherent laser pulse passes through the fiber, a portion of the light is reflected back as Rayleigh backscatter. External disturbances—such as vibrations, strain, or temperature changes—alter this backscatter, enabling distributed sensing without external sensors. SMF's single-mode propagation ensures high signal coherence, making it superior for long-range, high-resolution detection. MMF, while more sensitive locally, is limited in range due to modal dispersion .
SMF is optimal for long-distance, high-precision detection and backbone networks, offering minimal signal degradation and high localization accuracy. MMF is cost-effective for short-range applications, providing strong local sensitivity but limited by modal dispersion. The choice between SMF and MMF depends on operational range, environmental conditions, and budget, with hybrid systems sometimes used to leverage the advantages of both fiber types in sensing or communication networks .
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