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A multimode-optical-fiber Michelson interferometer is constructed by utilizing a fiber-optic directional coupler as a beam-splitting/recombining element, and is used to measure an amplitude of sinusoidal vibration in a homodyne detection scheme. The mixing efficiency in interferometry is discussed on a simplified assumption of the propagating field and related to the number of speckles received by a photodetector. In order to achieve a considerableS/Nin the beat photocurrent, the aperture to limit the number of speckles should be as small as a few percent of the radiation pattern in area. Theoretical considerations are followed by experiments.
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Imai et al. (1983) studied this question.
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