Optical pulse propagation in photonic grating structures can show anomalous (i.e., superluminal or negative) group velocities under certain circumstances owing to the anomalous dispersive properties induced by the periodic grating structure. Such phenomena can be observed for either linear pulse propagation in passive dielectric grating structures, such as in fiber Bragg gratings (FBGs), as wel...

Quality protein maize (QPM) was created converting the soft opaque-2 endosperm into a vitreous phenotype, but mechanisms involved in this modification are not completely understood. Recombinant inbred lines (RILs) derived from K0326Y QPM and W64Ao2 were used to identify quantitative trait loci (QTL) associated with starch physicochemical properties. RILs contrasting vitreousness also evaluate e...

Manuscript received October 13, 1999. Manuscript revised January 13, 1999. † The authors are with the Opto-Electronics Laboratories, Oki Electric Industry Co. Ltd., Hachioji-shi, 193-8550 Japan. a) E-mail: [email protected] SUMMARY 1.5 μm-band LiNbO 3 quasiphase matched (QPM) wavelength converters consisting of a periodical domain inverted structure and a proton exchanged waveguide, have been stud...