What does the term "mode" signify in fiber optics?

In the context of fiber optics, the term "mode" specifically refers to the way light propagates through the fiber. There are two main types of modes in optical fibers: single-mode and multi-mode.

In a single-mode fiber, the light travels in a single pathway or mode, which allows for minimal dispersion and supports longer distances with higher bandwidth capabilities. Multi-mode fibers, on the other hand, allow light to travel in multiple pathways or modes simultaneously, which can result in modal dispersion over longer distances.

Understanding the propagation of light through various modes is crucial for designing optical communication systems, as it influences factors such as bandwidth, signal quality, and distance limitations. Thus, identifying "mode" as the method of light propagation accurately captures its significance in fiber optics.