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

Dashti, P. Z.; Li, Q.; Lee, H. P.
December 2002
Applied Physics Letters;12/2/2002, Vol. 81 Issue 23, p4338
Academic Journal
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.


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