Abstract
Much research has been carried out on fibre Bragg grating (FBG) external cavity semiconductor lasers for application as stabilised carrier wave and modulated laser sources and as tuneable lasers. In this paper two novel FBG external cavity lasers are experimentally demonstrated. Both use the light reflected from the FBGs to force the lasers to operate at the Bragg wavelengths. They offer tuneable beat frequencies and are able to switch the polarisation and wavelength of the laser.
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