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How many propagation modes are present in single mode fibers?

How many propagation modes are present in single mode fibers? Correct Answer Two

For a given optical fiber, the number of modes depends on the dimensions of the cable and the variations of the indices of refraction of both core and cladding across the cross section. Thus, for a single mode fiber, there are two independent, degenerate propagation modes with their polarization planes orthogonal.

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