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Questions and Answers
What is the core diameter of multi-mode fiber?
What is the core diameter of multi-mode fiber?
- Less than 10 micrometers
- Greater than 10 micrometers (correct)
- Equal to 10 micrometers
- No core diameter
How does graded-index fiber reduce multi-path dispersion?
How does graded-index fiber reduce multi-path dispersion?
- By increasing the numerical aperture
- By decreasing the numerical aperture
- By increasing the index of refraction in the core
- By decreasing the index of refraction in the core (correct)
What is the purpose of the index profile in graded-index fiber?
What is the purpose of the index profile in graded-index fiber?
- To minimize the amount of dispersion
- To minimize the difference in axial propagation speeds (correct)
- To maximize the difference in axial propagation speeds
- To maximize the amount of dispersion
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Study Notes
- Multi-mode fiber is made from a fiber with a core diameter greater than 10 micrometers.
- Multi-mode fiber allows light to propagate down the fiber in rays both close to the axis and at various angles, allowing efficient coupling of light into the fiber.
- However, this high numerical aperture increases the amount of dispersion as rays at different angles have different path lengths and therefore take different amounts of time to traverse the fiber.
- In graded-index fiber, the index of refraction in the core decreases continuously between the axis and the cladding.
- The resulting curved paths reduce multi-path dispersion because high-angle rays pass more through the lower-index periphery of the core, rather than the high-index center.
- The index profile is chosen to minimize the difference in axial propagation speeds of the various rays in the fiber.
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