A fiber Bragg grating sensor array is interrogated by use of a passively mode-locked fiber laser source. A novel demodulation scheme that uses highly dispersive fiber to convert the grating wavelength shift to a temporal shift in the arrival time of the reflected pulses is demonstrated. The source bandwidth of >85 nm permits interrogation of many-grating arrays, and the demodulation technique permits fast sensing of large strains.
© 1997 Optical Society of America
Michael L. Dennis, Martin A. Putnam, Jin U. Kang, Tsung-Ein Tsai, Irl N. Duling III, and E. Joseph Friebele, "Grating sensor array demodulation by use of a passively mode-locked fiber laser," Opt. Lett. 22, 1362-1364 (1997)