Which of the following is NOT a feature of single-mode fiber?

Single-mode fiber is designed to carry light directly down the fiber without much reflection, which allows for higher bandwidth over longer distances. A significant feature of single-mode fiber is its small core diameter, typically around 8 to 10 microns, which supports only a single light mode. This design minimizes modal dispersion, enabling more efficient signal transmission over extensive distances while maintaining lower attenuation rates compared to multi-mode fiber.

In contrast, the characteristic of supporting multiple light modes is inherent to multi-mode fiber, which has a larger core diameter allowing multiple light paths or modes to propagate. This leads to modal dispersion where different modes can arrive at the destination at differing times, which can limit the effective distance and bandwidth of the signal compared to single-mode fiber. Thus, the assertion that single-mode fiber supports multiple light modes is incorrect and highlights why this option is NOT a feature of single-mode fiber.