The acousto-optic mode coupling from core to LP<sub>11</sub><sup>cl</sup> mode of a dispersion-compensating fiber excited by two acoustic waves with orthogonal perturbations is studied by use of a novel composite piezoelectric transducer. Highly polarization-dependent mode-selective spectra are observed that are due to coherent acousto-optic coupling between the core and various constituent cladding modes. Potential applications for implementing an all-fiber wavelength-tunable polarization analyzer are also discussed.
© 2003 Optical Society of America
P. Z. Dashti, Q. Li, C.-H. Lin, and H. P. Lee, "Coherent acousto-optic mode coupling in dispersion- compensating fiber by two acoustic gratings with orthogonal vibration directions," Opt. Lett. 28, 1403-1405 (2003)