Which of the following has more distortion1 pointGraded index fiberMultimode- step index fiberSingle Mode step-index fiberAll of these.

The fiber with the most distortion is the Multimode-step index fiber.

Here's why:

1. Single Mode step-index fiber: This type of fiber allows only one mode of light to propagate. As a result, there is no modal dispersion, which is a common cause of signal distortion in fiber optics. Therefore, single mode step-index fibers have the least distortion among the three.

2. Graded index fiber: In this type of fiber, the refractive index of the core varies with the radial distance from the fiber axis. This design minimizes modal dispersion by allowing light rays to travel faster along the outer edge of the fiber than along the center. Therefore, graded index fibers have less distortion than multimode step-index fibers but more than single mode step-index fibers.

3. Multimode-step index fiber: This type of fiber allows multiple modes of light to propagate, each at a different speed. This leads to modal dispersion, where different modes arrive at the end of the fiber at different times, causing signal distortion. Therefore, multimode step-index fibers have the most distortion among the three.