Fiber Optics Part 2: Single-Mode Fiber vs. Multi-Mode-Fiber

Fiber optic transmission occurs because optical fiber acts as a waveguide. The light signals that are transmitted down the fiber create modes, or stable patterns, in which a wave can travel down the waveguide. The number of possible modes that can be transmitted by the waveguide, for a given wavelength of light, increases as the core diameter of the fiber increases.

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