Revised model of acousto-optic interaction in optical fibers endowed with a flexural wave

We propose a novel model of the acousto-optic interaction in circular fibers endowed with the lowest-order flexural acoustic wave that is based on the actual distribution of the acoustically induced displacement vector. The corresponding expression for the fiber's permittivity is derived and co...

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Bibliographic Details
Published in:Optics letters 2019-02, Vol.44 (3), p.598-601
Main Authors: Yavorsky, M A, Vikulin, D V, Barshak, E V, Lapin, B P, Alexeyev, C N
Format: Article
Language:English
Subjects:
Acousto-optics
Conversion
Linear polarization
Optical fibers
Optical frequency
Optics
Propagation modes
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Summary:We propose a novel model of the acousto-optic interaction in circular fibers endowed with the lowest-order flexural acoustic wave that is based on the actual distribution of the acoustically induced displacement vector. The corresponding expression for the fiber's permittivity is derived and compared with the commonly used one. The resonance optical fiber modes and the propagation constants are found. It is predicted that the lengths of the well-known acoustically driven mode conversion LP →LP should be slightly different for the x- and y-polarized incident fundamental modes. Moreover, we unveil a new polarization-dependent mode conversion in which the azimuthal mode number ℓ, as well as the optical frequency of the generated standard fiber mode LP , is governed by the linear polarization direction of the incident zero-order beam LP .
ISSN:0146-9592
1539-4794
DOI:10.1364/OL.44.000598