Single-mode and multimode fiber lengths

Single-mode fibers can transmit data up to 40–100 km, while multimode fibers are optimized for shorter distances, typically up to 400 meters.

Single-

Mode Fiber (SMF)Single-mode fiber features a narrow core of about 8–10 µm, allowing only one mode of light to propagate. This design minimizes modal dispersion, enabling data transmission over very long distances with high signal integrity. Common types include OS1 and OS2: OS1: Indoor use, supports distances up to 10 km at 10 Gbps without amplification.

OS2: Outdoor or long-haul use, supports distances up to 40 km at 10 Gbps, and with advanced transceivers, can reach 100 km or more. Single-mode fibers typically use 1310 nm or 1550 nm wavelengths with laser sources, making them ideal for backbone networks, carrier-grade telecommunications, and long-haul links. Multimode Fiber (MMF)Multimode fiber has a larger core (50 µm or 62.

5 µm), allowing multiple light modes to propagate simultaneously. This increases modal dispersion, which limits the effective transmission distance. Multimode fibers are commonly used for short-distance, high-speed applications such as data centers and LANs.

Typical types include: OM1 (62. 5 µm): Up to 200–300 meters at 1 Gbps. OM2 (50 µm): Up to 500 meters at 1 Gbps.

OM3/OM4 (laser-optimized 50 µm): Up to 300–400 meters at 10 Gbps, with OM4 supporting higher bandwidth and slightly longer distances. OM5: Designed for wideband multimode applications, similar distances as OM4 but optimized for multiple wavelengths. Multimode fibers typically use 850 nm and 1300 nm wavelengths with LED or VCSEL light sources, making them cost-effective for short-range, high-capacity networks.

Summary

Fiber Type

Core SizeTypical WavelengthMaximum DistanceTypical UseSingle-mode (OS1/OS2)8–10 µm1310/1550 nm10–100 kmLong-haul, backbone, carrier networksMultimode (OM1–OM5)50–62. 5 µm850/1300 nm200–400 mData centers, LANs, short-range high-speed linksIn conclusion, single-mode fiber is preferred for long-distance and high-bandwidth applications, while multimode fiber is suitable for short-distance, cost-sensitive deployments. The choice depends on network distance requirements, budget, and future scalability.