Which distance value is associated with single-mode optical fiber backbone distance?

Which distance value is associated with single-mode optical fiber backbone distance?

• A. 10,000 meters
• B. 60,000 meters
• C. 90 meters
• D. 800 meters

Answer: (B)

Single-mode fiber can carry light in a single path, which minimizes modal dispersion and keeps the signal sharp over long distances. That property makes it ideal for backbone links that connect distant network devices. Because attenuation and dispersion are low, a typical backbone distance for single-mode fiber is about 60,000 meters (60 km) without requiring heavy amplification or repeaters. The other distances are more representative of shorter campus or building runs or of copper-based links, not the long-haul backbone that SMF supports. So the distance value associated with single-mode optical fiber backbone distance is 60,000 meters.

Single-mode fiber can carry light in a single path, which minimizes modal dispersion and keeps the signal sharp over long distances. That property makes it ideal for backbone links that connect distant network devices. Because attenuation and dispersion are low, a typical backbone distance for single-mode fiber is about 60,000 meters (60 km) without requiring heavy amplification or repeaters. The other distances are more representative of shorter campus or building runs or of copper-based links, not the long-haul backbone that SMF supports. So the distance value associated with single-mode optical fiber backbone distance is 60,000 meters.