A novel fiber Bragg grating (FBG) sensing system based on a spectrum-limited Fourier domain mode-locking (SL-FDML) fiber laser is proposed. Multiple FBGs cascaded in a long fiber are utilized as both the sensors in the system and the wavelength-selected components in the SL-FDML fiber laser. Both wavelength-division multiplexing and spatial-division multiplexing techniques are demonstrated for interrogation of multiple FBGs by mapping the wavelength measurement to the time measurement and by adjusting the driving frequency of the SL-FDML fiber laser. The proposed FBG sensing system, employing techniques of the wavelength- and spatial-domain interrogation of multiple FBGs, can be used in remote and quasi-distributed multipoint sensing.
© 2008 Optical Society of America
Fiber Optics and Optical Communications
Original Manuscript: January 17, 2008
Revised Manuscript: April 9, 2008
Manuscript Accepted: May 22, 2008
Published: June 19, 2008
Daru Chen, Chester Shu, and Sailing He, "Multiple fiber Bragg grating interrogation based on a spectrum-limited Fourier domain mode-locking fiber laser," Opt. Lett. 33, 1395-1397 (2008)