Abstract
Fibre Bragg gratings (FBGs) are inscribed in homemade microstructuredfibres by the standard phase mask method. Enhanced couplings betweenthe forward fundamental mode and backward cladding modes are obtained.The mode coupling and spectral characteristics are investigatedexperimentally. The cladding mode resonances can be affected by fillingactive materials into the air holes, which will be useful for theimplementation of tunable photonic devices in optical fibrecommunication and sensing systems.
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