Various LPFG - based devices have been developed : filters , sensors , fiber dispersion compensators , etc .
Various gratings with complex structures have been designed : gratings combining several LPFGs , LPFGs with superstructures , chirped gratings , and gratings with apodization .
Various LPFGs - based devices have been developed : filters , sensors , fiber dispersion compensators , etc .
Various gratings with complex structures have been designed : gratings combining several LPFGs , LPFGs with superstructures , chirped gratings , and gratings with apodization .