□C. Single-mode fiber-optic cabling has a maximum distance...

$\square$ C. Single-mode fiber-optic cabling has a maximum distance of approximately $2 \mathrm{~km}$.
ख A, B, and D are incorrect distances for single-mode fiber, although 300 meters is the maximum distance of multimode fiber.

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Key Concepts

Single-mode fiber

Single-mode fiber is designed with a very narrow core that permits the propagation of light in only one mode. This design minimizes modal dispersion, allowing the signal to travel longer distances with high bandwidth and lower loss, which makes it ideal for long-haul communications.

Multimode fiber

Multimode fiber features a wider core that supports the transmission of light in multiple modes. Due to modal dispersion, signals tend to spread out over distance, which limits the maximum length of transmission. As a result, multimode fiber is typically used for shorter distance communications.

Transmission distance limitations

Transmission distance limitations in optical fibers are influenced by factors such as modal dispersion, attenuation, and the type of fiber used. While single-mode fibers allow for longer distances due to reduced dispersion and lower losses, multimode fibers are generally limited to shorter distances because the multiple light paths can lead to signal degradation.

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