Coaxial acousto-optical fiber frequency shifter

Michael Berwick; David A. Jackson

doi:10.1117/12.141200

19 February 1993 Coaxial acousto-optical fiber frequency shifter

Michael Berwick, David A. Jackson

Proceedings Volume 1792, Components for Fiber Optic Applications VII; (1993) https://doi.org/10.1117/12.141200
Event: Fibers '92, 1992, Boston, MA, United States

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.

Citation Download Citation

Michael Berwick and David A. Jackson "Coaxial acousto-optical fiber frequency shifter", Proc. SPIE 1792, Components for Fiber Optic Applications VII, (19 February 1993); https://doi.org/10.1117/12.141200

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