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Abstract
The mechanism of the linear intensity modulation by external mechanical vibrations on a multimode fiber has been investigated theoretically. The effect of power redistribution among the guided modes which arises from mode-coupling is evaluated for a few-mode fiber. It is shown that linear intensity modulation occurs if the vibration-induced stress of the core lacks axial symmetry. The sensitivity is given by a first order effect in mode-coupling and is significantly enhanced at the resonance condition. This linear effect is a different one from the quadratic effect due to bending loss.
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