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

Low-moded optical fibres are very microphonic when guiding highly coherent light. Acoustic
signals applied to the fibre cause phase modulation of the optical carrier. This phase …

It is shown that the acoustically-induced phase modulation of coherent light propagating
within an insonified multimode optical fibre may be linearly detected using heterodyne and …

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 …

Low-moded coherent optical fibre systems are very microphonic. Any mechanical stress
applied to the fibre causes phase modulation of the guided optical carrier, which is then …

In order to be able to implement the signal processing techniques required for single mode
fiber sensors, a means is required of measuring changes in one or more of the parameters …

With the availability of high quality optical fibers, numerous optical fiber sensors have been
invented. Phase modulations in single-mode fibers have been utilized to detect acoustic …

Single sideband optical frequency shifters in waveguide form have been pursued for many
years for use in fiber-optic systems such as gyroscopes, heterodyned sensors, signal …

A closed-loop, multiturn fiber-optic rotation sensor has been developed that exhibits low
noise of the order of 0.1°/h for an averaging time of 30 sec. This performance is consistent …

Photoinduced refractive-index changes in two-mode, elliptical-core optical fibers affect the
beat length and the sensor sensitivity. Chirped gratings are written by attaching such fibers …