Question

what is the core diameter
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Answer 1

Answer:

core diameter: In the cross section of a realizable optical fiber, ideally circular, but assumed to a first approximation to be elliptical, the average of the diameters of the smallest circle that can be circumscribed about the core-cladding boundary, and the largest circle that can be inscribed within the core- ...

Answer 2

Answer:

Core diameters used in MOS are generally in the range of 50 to 500 μm, and the thickness of the cladding is typically about one-tenth that of the core.