Spectral filtering using fibre bragg grating embedded sagnac loop mirror

An approach to achieve spectral filtering is proposed, using a fibre Bragg grating (FBG) embedded polarisation maintaining fibre Sagnac loop mirror (SLM) through temperature tuning. The opposite temperature sensitivities of the FBG Bragg resonance wavelengths and the interferometric peaks of the fibre SLM, as well as their pronounced difference in bandwidth, provide an opportunity to realise spectral filtering.