List the three forms of optical fiber, and give the general properties of each.
What will be an ideal response?
There are three forms of optical fibers that provide a choice between performance and cost:
? Multimode - Step Index: The least expensive, and is used when performance is unimportant.
The boundary between the fiber and the cladding is abrupt which causes light to reflect
frequently. Therefore, dispersion is high.
? Multimode - Graded Index: Slightly more expensive than the step index fiber. It has the
advantage of making the density of the fiber increase near the edge/It reduces reflection and
lowers dispersion.
? Single Mode - The most expensive, and provides the least dispersion. The fiber has a smaller
diameter and other properties that help reduce reflection. It is used for long distances and
higher bit rates.
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