What is a defining characteristic of multi-mode fiber when compared to single-mode fiber?

Multi-mode fiber is characterized by its larger core diameter, which allows it to carry multiple wavelengths of light simultaneously. This larger core is essential for its functionality, enabling it to support multiple light paths or modes, which is a key distinction from single-mode fiber that has a much smaller core and transmits light in a single path.

When comparing costs, multi-mode fiber is generally cheaper to produce due to the simpler manufacturing processes and materials needed for its larger core and multimodal capabilities. This makes it a more economical choice for shorter distance applications, local area networks, and environments where high bandwidth is necessary over moderate distances.

In contrast, single-mode fiber, with its smaller core diameter, is designed for long-distance transmission with minimal signal loss, allowing it to carry signals over greater distances than multi-mode fiber. It typically supports only one wavelength of light to prevent modal dispersion.

Thus, the defining characteristic of multi-mode fiber, particularly when compared to single-mode fiber, is its cost-effectiveness and suitability for less critical networking needs, thanks to its ability to support multiple light paths.