Novel Optical Direct Detection Scheme for DPSK Signals Using Fibre Bragg Gratings. - Pascual Muñoz; Idelfonso Tafur Monroy; Raimundo García; Juan Jose Vegas Olmos; Frans M. Huijskens; Salvador Sales Maicas; A. Gonzalez; José Capmany; Antonius M. J. Koonen (OpNeTec, 2004)