We propose and demonstrate a novel apodization technique for an elliptical-core two-mode fiber acousto-optic filter by twisting the fiber and adjusting the acoustic polarization. The sidelobe suppression in the filter spectrum was improved from −9.7 to −15.5 dB. A theoretical analysis that includes acoustic birefringence explains the experimental results with good agreement.
© 2005 Optical Society of America
Fiber Optics and Optical Communications
Hyun Chul Park, Byoung Yoon Kim, and Hee Su Park, "Apodization of elliptical-core two-mode fiber acousto-optic filter based on acoustic polarization control," Opt. Lett. 30, 3126-3128 (2005)