We present a novel and simple technique for obtaining transversal filters with negative coefficients by using uniform fiber Bragg gratings. We demonstrate a wide tuning range, good performance, low cost, and easy implementation of multitap filters in an all-optical passive configuration in which negative taps are obtained by use of the transmission of a broadband source through uniform Bragg gratings.
© 2003 Optical Society of America
(060.0060) Fiber optics and optical communications : Fiber optics and optical communications
(060.4510) Fiber optics and optical communications : Optical communications
(230.1480) Optical devices : Bragg reflectors
J. Mora, M. V. Andrés, J. L. Cruz, B. Ortega, J. Capmany, D. Pastor, and S. Sales, "Tunable all-optical negative multitap microwave filters based on uniform fiber Bragg gratings," Opt. Lett. 28, 1308-1310 (2003)