Fundamental properties of Bragg gratings and their application to the design of advanced structures

摘要: This thesis presents the analysis of local properties Bragg gratings and their application to improvement standard designs advanced structures. The time spent by light inside each grating section is derived in terms complex-valued quantities, clear meaning given both real imaginary parts. Improved physical understanding propagation energy distributions periodic structures obtained. Local also explain a more intuitive way well understood features different gratings, which improves intuition new complex designs. effect perturbations immediate using this approach has important practical applications. Independent confirmation theory obtained, experimental measurement part delay given. Phase errors affect writing techniques, related sensitivity analysed detail. robustness discussed with respect such manufacturing errors. Fine tuning or means suitable error proposed, optimised characteristics either reflectivity dispersive response are method integrated inverse scattering further boost performances. proposed case losses grating. Cladding mode compensated an iterative layer-peeling algorithm. design first wide-band dispersion-compensating realised single fibre shown. Background UV-induced modified method. limitations lossy media explained properties. New considered that fully exploit theoretical potentialities capabilities gratings. performance code-division multiple access systems based on superstructured improved combining encoding, bandwidth filtering, dispersion compensation same high