Abstract

We propose a new multiplexing technique using amplitude-modulated chirped fiber Bragg gratings that have an identical center Bragg wavelength. Each grating is inscribed with a unique amplitude modulation that allows them to be multiplexed with complete overlapping within a certain bandwidth. To demodulate the multiplexed signal, the discrete wavelet transform is employed. Concurrently, a wavelet denoising technique is used to reduce the noise. This proposed multiplexing technique has been verified through strain measurements. Experimental results showed that for strains applied up to $1250\mu \epsilon$ the absolute error and cross-talk are within $\pm 20\mu \epsilon$ and $16\mu \epsilon$, respectively. A strain resolution of $4\mu \epsilon$ is obtained.

© 2007 Optical Society of America

Simultaneous demodulation technique for a multiplexed fiber Fizeau interferometer and fiber Bragg grating sensor system

Allan C. Wong, Paul A. Childs, and Gang-Ding Peng
Opt. Lett. 31(1) 23-25 (2006)

Multiple-element photonic microwave true-time-delay beamforming incorporating a tunable chirped fiber Bragg grating with symmetrical bending technique

Young-Geun Han and Ju Han Lee
Opt. Lett. 32(12) 1704-1706 (2007)

Fast and accurate group delay ripple measurement technique for ultralong chirped fiber Bragg gratings

Tae-Jung Ahn, Yongwoo Park, and José Azaña
Opt. Lett. 32(18) 2674-2676 (2007)

Vernier-effect optical interrogation technique for fiber Bragg grating sensors

Gregory B. Tait
Appl. Opt. 46(28) 6879-6884 (2007)

Fiber Bragg grating–based self-referencing technique for wavelength-multiplexed intensity sensors

S. Abad, M. López-Amo, F. M. Araújo, L. A. Ferreira, and J. L. Santos
Opt. Lett. 27(4) 222-224 (2002)