Single-mode fiber (SMF) has a small core diameter of approximately 8–10 µm, allowing only a single light mode to propagate. This minimizes modal dispersion, enabling higher bandwidth and longer transmission distances . Multimode fiber (MMF) has a larger core, typically 50 µm or 62.5 µm, which allows multiple light modes to travel simultaneously. This can cause modal dispersion, limiting the effective distance and bandwidth for high-speed signals .
SMF typically uses laser diodes at wavelengths such as 1310 nm or 1550 nm, which are suitable for long-distance transmission . MMF commonly uses VCSEL lasers at 850 nm for 10G applications, optimized for short-reach links within data centers or enterprise networks .
For 10 Gigabit Ethernet:
SMF offers virtually unlimited bandwidth potential due to the absence of modal dispersion, making it ideal for future-proof, high-speed networks . MMF bandwidth is constrained by modal dispersion, but higher-grade fibers like OM4 and OM5 improve effective modal bandwidth and support shortwave wavelength division multiplexing (SWDM) to increase link capacity .
SMF is more expensive due to precise manufacturing requirements and higher-cost laser diodes . MMF is more cost-effective for short-reach applications, using less expensive transceivers and simpler installation . In practice, MMF is preferred for intra-data center connections, while SMF is chosen for long-haul or campus networks.
10G SFP+ modules are designed specifically for either SMF or MMF. SMF SFPs (e.g., 10GBASE-LR) support long distances and require compatible single-mode fiber, while MMF SFPs (e.g., 10GBASE-SR) are optimized for short-reach multimode links . Module selection must consider wavelength, fiber type, reach, and host compatibility.
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