New configuration for an optical fiber acousto-optic frequency shifter

Osni Lisboa; James N. Blake; J. Edimar B. Oliveira; Sidney L. Alessi Carrara

doi:10.1117/12.20285

1 August 1990 New configuration for an optical fiber acousto-optic frequency shifter

Osni Lisboa, James N. Blake, J. Edimar B. Oliveira, Sidney L. Alessi Carrara

Proceedings Volume 1267, Fiber Optic Sensors IV; (1990) https://doi.org/10.1117/12.20285
Event: The International Congress on Optical Science and Engineering, 1990, The Hague, Netherlands

Abstract

We describe a new configuration for an optical fiber acousto-optic frequency shifter using a section of two-mode fiber where acousto-optic interaction causes mode-convertion accompanied by single sideband frequency translation. A fiexural acoustic wave travels in the stripped section of the two-mode fiber. Because both optical and acoustic waves are confined in the fiber, high efficiencies (close to 100 %) can be achieved with relatively low RF power (< 100mW) applied to the transducer. The acoustic wave is excited in the fiber via an acoustic horn, which focuses the acoustic energy generated by a 5 x 5 mm2 transducer into a fiber-size tip. The new configuration proposed here employs the fiber and the acoustic horn in a collinear assembly, which can reduce excitation of backward acoustic waves in the fiber, contributing to a better image sideband suppression. Moreover, the collinear configuration improves ruggedness of the fiber-to-horn bond as well as device compactness. An improvement of the acoustic bandwidth was also observed. A study of several possible variations of the main configuration was performed and an optimization regarding power requirements, convertion efficiency and acoustic bandwidth is discussed.

Citation Download Citation

Osni Lisboa, James N. Blake, J. Edimar B. Oliveira, and Sidney L. Alessi Carrara "New configuration for an optical fiber acousto-optic frequency shifter", Proc. SPIE 1267, Fiber Optic Sensors IV, (1 August 1990); https://doi.org/10.1117/12.20285

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