The amount of optical power coupled into an optical fiber depends on what four factors?

The amount of optical power coupled into an optical fiber  depends on what four factors?
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Answer :

(1) The angles over which the light is emitted. (2) The size of the  source's light-emitting area relative to the fiber core size. (3) The  alignment of the source and fiber. (4) The coupling characteristics of  the fiber (such as the NA and the refractive index profile)
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