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What is needed to predict the performance characteristics of single mode fibers?

What is needed to predict the performance characteristics of single mode fibers? Correct Answer Geometric distribution of light in a propagating mode

A mode field diameter (MFD) is a fundamental parameter of single mode fibers. It tells us about the geometric distribution of light. MFD is analogous to core diameter in multimode fibers, except in single mode fibers not all the light that propagates is carried in the core.

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