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Why is Erbium Doped Fiber Amplifier (EDFA) preferred over Erbium Doped Waveguide Amplifier (EDWA)?

The question has been asked from an engineering point of view, but obviously I would also be interested in Physics of it. Is it just because of the difficulty of constructing a waveguide, or is there something more? I understand the individual benefits and limitations of a fiber amplifier and a waveguide but cannot understand the preference in this case.

http://en.wikipedia.org/wiki/Optical_amplifier#Doped_fiber_amplifiers

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I don't see what the difference is from a Physics point of view. Fibers are waveguides. From an Engineering point of view, it makes sense to distribute it along a fiber where the length can be adjusted instead of a silica/polymer flat waveguide which is a far less flexible support. –  Anael Jul 15 at 16:56

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