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The capability of changing the optical output of a tapered single-mode fiber by using a liquid crystal as an electrelectrooptical medium is shown.
An abruptly tapered fiber can be essentially divided into three different regions: one beating region in its central, quasi-cylindrical part, lying between two coupling regions, where the slopes are large. In this paper we report two experiments which help to visualize and analyze the beating region. We show that, in this region, there are principally two… (More)
The visualization of traveling acoustic waves is achieved by means of acoustic stroboscopy. The limitations of the technique, interpretation of results, frequency range, and optical noise are reviewed. Two methods of noise reduction are studied: spatial filtering and holography. Optical holography of acoustic fields is also shown to offer the best… (More)
Optical Fourier analysis of acoustic fields is used for the interpretation of acoustic disturbances. The method is applied to the study of modes propagating in an elastic waveguide. In particular, the mode dispersion curves are determined with an accuracy greater than that with purely acoustic methods.
The fabrication of interference filters in optical fibers is reported with new results indicating the possibility of growing several filters in the same fiber, together with the existence of an apparent saturation level that depends on the coupled power level.
A theoretical model has been developed which describes the growth of a photo-induced Bragg filter in a single-mode optical fiber. This model is derived from the coupled wave theory and takes into account Fresnel reflections at both ends of the fiber. The frequency response of the filter is the result of the combined effect of both the distributed and… (More)