Which theory describes the behavior of light within an optical fiber?

Mode theory is the correct choice because it specifically describes the behavior of light as it travels through an optical fiber. This theory explains how light can follow different paths or modes within the fiber, depending on the physical properties of the fiber and the wavelength of the light being transmitted.

In optical fibers, light can be guided through multiple modes, especially in multimode fibers, or it may be confined to a single mode in single-mode fibers. These modes represent distinct patterns of light propagation, affected by the refractive index profile of the fiber, which is crucial for optimizing performance, bandwidth, and signal quality. Understanding mode theory is essential for engineers and technicians working with optical communication systems, as it directly impacts design choices and the performance characteristics of fiber optic networks.

Other options, while related, do not specifically encapsulate the behavior of light in fibers. Optical transmission theory can cover a broader range of phenomena, including aspects of fiber performance but does not focus solely on modes. Refraction theory addresses the bending of light as it passes through different media but does not detail how these behaviors manifest in the context of optical fibers. Propagation theory generally discusses how waves travel through various mediums, which is useful but lacks the specificity regarding the modes of light in optical fibers that