Q.

The optical power coupled from one fiber to another is limited by                          

A. numerical apertures of fibers
B. varying refractive index of fibers
C. angular power distribution at source
D. number of modes propagating in each fiber
Answer» D. number of modes propagating in each fiber
Explanation: when two fibers are coupled to each other, the optical power is limited by number of modes propagating in each fiber. for example, when a fiber propagating with 500 modes is connected to a fiber that propagates only 400 modes, then at maximum, only 80% of power is coupled into the other fiber.
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