Azimuthal variations in the refractive index that are inherent in CO2 -laser-induced long-period fiber gratings (LPFG's) coupled to small controlled flexure of the LPFG produce a wide variety of transmission characteristics as a function of LPFG curvature. The particularly useful cases of (1) wavelength tuning at a constant attenuation and (2) variable attenuation (switching) at a constant wavelength are demonstrated by flexing of LPFG's that have been appropriately axially rotationally oriented relative to the plane of curvature.
© 2001 Optical Society of America
Gregory D. VanWiggeren, Thomas K. Gaylord, Donald D. Davis, Mohammad I. Braiwish, Elias N. Glytsis, and Emmanuel Anemogiannis, "Tuning, attenuating, and switching by controlled flexure of long-period fiber gratings," Opt. Lett. 26, 61-63 (2001)