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A short multi-wavelength fiber Bragg grating (MW-FBG) fabrication method is proposed and demonstrated. The MW-FBG fabrication method includes making expanded core in the photosensitive single mode fiber (P-SMF) by the discharge-based thermal diffusion technique and writing FBGs on the pre-processed P-SMF through ultraviolet exposure technique. The effect of the arc discharge is to make the dopant...
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