A network for multiplexing fiber Bragg gratings (FBGs) and intensity-modulated fiber-optic sensors with no need to distinguish between the two kinds of sensor is proposed and experimentally demonstrated. Two FBG sensors and two intensity-modulated sensors are wavelength-division multiplexed; the electrical phase of the output signal is measured as a common parameter for both types of sensor. Furthermore, the intensity sensors become power referenced, and the FBG sensors are interrogated by a low-cost technique. Low cross talk is achieved by use of a tunable optical filter at the detector.
© 2003 Optical Society of America
Original Manuscript: January 20, 2003
Revised Manuscript: May 6, 2003
Published: September 1, 2003
Silvia Abad, Francisco M. Araújo, Luis Alberto Ferreira, José Luís Santos, and Manuel López-Amo, "Transparent network for hybrid multiplexing of fiber Bragg gratings and intensity-modulated fiber-optic sensors," Appl. Opt. 42, 5040-5045 (2003)