Sign up ×
Physics Stack Exchange is a question and answer site for active researchers, academics and students of physics. It's 100% free.

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.

share|cite|improve this question
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 '14 at 16:56

Your Answer


By posting your answer, you agree to the privacy policy and terms of service.

Browse other questions tagged or ask your own question.