Discussion
Which is the major cause of dispersion in multimode step index optical fiber ?
Answer: A
The major cause is intermodal dispersion.
A multimode step index fiber carries many modes, which travel along paths of different lengths: a ray along the axis covers less distance than one zigzagging at the critical angle. Since all travel in the same core material at the same speed, they arrive at different times, and a short input pulse spreads out. This intermodal (modal) delay is far larger than any other dispersion in such a fiber.
Material (chromatic) and waveguide dispersion arise from the variation of speed with wavelength. They dominate in single-mode fiber, where intermodal dispersion is absent, but they are small compared with modal dispersion in multimode step index fiber.
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