Fibre Bragg gratings (FBGs) are considered to be excellent sensor elements, suitable for measuring static and dynamic fields such as strain, temperature, pressure and magnetic fields. Various schemes have been demonstrated to detect the wavelength change produced by the measurand. These include CCD spectrometer, interferometric wavelength shift detection, edge filter and tuneable filter techniques. Arrayed waveguide gratings (AWGs) have emerged from the development of wavelength division multiplexed systems, which require multiplexers and demultiplexers to combine signals from several sources over a single fibre. As yet their use in sensing systems has not been explored in detail. La this paper we will discuss issues relating to the interrogation of FBGs using an AWG.
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