It is shown that the acoustically induced phase modulation of coherent light propagating
within a multimode optical fiber may be linearly detected by an interferometer employing an …

Abstract Recent publications [1]–[3] have reported the detection of acoustically induced
phase modulation in optical fibers. The first two discussed such an effect for use as a …

A method for detecting sound using a single step-index multimode fiber is presented. The
detected signal results from differences in acoustically induced phase shifts between two …

A series of fiber-optic acoustic sensors based on the Sagnac interferometer are described.
Features of these sensors include filtering of low-frequency signal components, use of a …

Recently there has been much effort to develop passive fiber-optic acoustic sensors [1] that
require no electrical power at the sensor. One approach that potentially provides extreme …

A single monomode fiber-optic acoustic sensor is proposed. The acoustic wave differentially
changes the phase velocities of the polarization eigenmodes in a tension-coiled fiber …

A planar flexible fiber-optic interferometric acoustic sensor has been developed by wrapping
optimized single-mode fibers in a planar spiral form and then embedding the fiber in a thin …

Very sensitive optical hydrophones are obtainable by employing interferometry with
homodyne detection.[1],[2] Figure 1 shows the principle of operation. Laser light from an …

Fibredyne systems employ fibre-optic self-homodyne techniques for exploiting the
microphonic nature of optical fibres when conveying highly coherent light. Any strain …

This paper describes a method of multiplexing several optical signals onto a single spatial
channel (eg, a single-mode fiber) using a short coherence length continuous wave light …