Optical Bistability by Using a Tunable Fibre Laser with Fibre Fabry--Perot

We observe a novel hybrid optical bistability by using an electro-optically tuned cw fibre laser with a fibre Fabry--Perot filter. The principles of the optical bistable device in two operation manners are analysed. The applications in monitoring the wavelength shift of a tunable fibre laser and fibre sensor of digital type are also discussed.