Daniel E. CEBALLOS-HERRERA^*, Ismael TORRES-GÓMEZ, Alejandro MARTÍNEZ-RÍOS, and José J. SÁNCHEZ-MONDRAGÓN¹

Centro de Investigaciones en Óptica A.C., León, Guanajuato, 371750, México
¹Instituto Nacional de Astrofísica, Óptica y Electrónica, Tonantzintla, Puebla, 72000, México

(Received August 9, 2009; Accepted September 16, 2009)

We present the spectral analysis of higher-order core mode resonances in a long period holey fiber grating induced mechanically in an asymmetric holey fiber. Calculations based on a fast-Fourier transform mode solver shows that the mode resonances obtained experimentally correspond to the odd- and even-LP_1,1 core modes. Additionally, we analyze the twist and polarization response of these mode resonances in the long period holey fiber grating. The results obtained in this work are of great importance in the design of new all-fiber optical devices that involve couplings of higher order core modes in asymmetric holey fibers.

Key words: holey fiber, core modes, long-period fiber gratings, mechanically induced gratings

^*E-mail address: danielc@cio.mx