Third order Bragg grating filters in small SOI waveguides Seong Phun Chan, Vittorio M. N. Passaro, Goran Z. Mashanovich, Graham Ensell and Graham T. Reed J. Eur. Opt. Soc.-Rapid Publ., 2 (2007) 07029 Published online: 13 November 2007 DOI: 10.2971/jeos.2007.07029