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As is well known from coupled oscillators, energy always flows from that
with advanced phase to that with retarded phase. The energy transfer is most
efficient if the phase of the driving oscillator is 90? advanced with respect
to the driven oscillator. This can be generalized to traveling waves.
Right after the launch point, energy from wave A feeds wave B which at
this point just emerges. The phase of wave B is automatically arranged such
that an energy transfer takes place. A certain distance down the fiber, both
waves have experienced a relative phase shift of 90? and energy transfer ceases.
A little further on, the phase of wave B is advanced and energy is transferred
back!
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