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1 December 1991 Demonstration of birefringent optical fibre frequency shifter employing torsional acoustic waves
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A fibre-optic frequency shifter utilising torsional acoustic waves to produce a travelling perturbation which couples the polarisation eigenmodes of a linearly birefringent optical fibre, is demonstrated. The shift in optical frequency was 3.195MHz and an optical coupling efficiency of 6% was obtained with 780mW of electrical power. 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.
© (1991) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
M. Berwick "Demonstration of birefringent optical fibre frequency shifter employing torsional acoustic waves", Proc. SPIE 1584, Fiber Optic and Laser Sensors IX, (1 December 1991);


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