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Measurement of acoustic wavelength in optical fiber via acousto-optic interaction

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3 Author(s)
Dashti, P.Z. ; Department of Electrical and Computer Engineering, Henry Samueli School of Engineering, University of California, Irvine, Irvine, California 92697 ; Li, Q. ; Lee, H.P.

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The wavelength of the lowest-order propagating flexural acoustic wave in a single-mode fiber is measured by creating an acoustic cavity with variable length. The amplitude of the acoustic standing wave is probed by means of acousto-optic coupling between the core and cladding modes in the optical fiber. By monitoring the periodic modulation of the core–mode transmittance versus the cavity length, the acoustic wavelength can be measured to a high degree of accuracy. Excellent agreement (≪1%) between the measured values and theoretical calculations for three types of 125 μm diameter single-mode fibers is obtained in the frequency range from 1.2 to 3.5 MHz. © 2002 American Institute of Physics.

Published in:

Applied Physics Letters  (Volume:81 ,  Issue: 23 )