Fibre Bragg Gratings Inscribed in Homemade Microstructured Fibres

Fibre Bragg gratings (FBGs) are inscribed in homemade microstructured fibres by the standard phase mask method. Enhanced couplings between the forward fundamental mode and backward cladding modes are obtained.
The mode coupling and spectral characteristics are investigated experimentally. The cladding mode resonances can be affected by filling
active materials into the air holes, which will be useful for the implementation of tunable photonic devices in optical fibre communication and sensing systems.