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Tunability of the FBG group delay through acousto-optic modulation

Marques, C. ; Oliveira, R.A. ; Pohl, A. ; Nogueira, R.N.

Optical Fiber Technology Vol. 19, Nº 2, pp. 121 - 125, March, 2013.

ISSN (print): 1095-9912
ISSN (online): 1068-5200

Journal Impact Factor: 1,300 (in 2014)

Digital Object Identifier: 10.1016/j.yofte.2012.11.010

A new method for fine control of the group delay of a fiber Bragg grating (FBG) is presented. It is based on an acoustic wave applied to the fiber. The standing acoustic wave imposes a periodic chirp to the uniform FBG. Tunability is obtained through adjustment of the intensity and/or frequency of the acoustic wave. A fast switching time of ~17 us was achieved. The experimental results were verified by theoretical simulation showing a good agreement between them. It can be used for different applications such as tunable narrow dispersion compensator for independent coarse wavelength division multiplexing (CWDM) channels or optical delay lines.