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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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