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Proceedings Paper

Coaxial acousto-optical fiber frequency shifter
Author(s): Michael Berwick; David A. Jackson
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Paper Abstract

A fiber-optic frequency shifter utilizing torsional acoustic waves to produce a travelling perturbation which couples the polarization eigenmodes of a linearly birefringent optical fiber, is demonstrated. The frequency shifter configuration is such that the acoustic wave generator and optical fiber are co-axial. The device is thus more rugged than previous 'free fiber' frequency shifters which have incorporated a T-junction between acoustic generator and optical fiber. The shift in optical frequency was 3.204 MHz and an optical coupling efficiency of 12% was obtained with 4 W of electrical drive power applied to the acoustic transducer. The theory of operation of this device is presented using a coupled mode approach, and the coupling coefficient for a fundamental torsional mode is derived in terms of its peak angular displacement.

Paper Details

Date Published: 19 February 1993
PDF: 10 pages
Proc. SPIE 1792, Components for Fiber Optic Applications VII, (19 February 1993);
Show Author Affiliations
Michael Berwick, Univ. of Kent at Canterbury (United Kingdom)
David A. Jackson, Univ. of Kent at Canterbury (United Kingdom)

Published in SPIE Proceedings Vol. 1792:
Components for Fiber Optic Applications VII
Paul M. Kopera, Editor(s)

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