A single-mode fiber-optic ring resonator is used as a multipath reference for multiplexing white light interferometric sensors. The theory of applying the resonator for multiplexing Michelson-type interferometer sensor is presented. The capacity of the technique in terms of maximum sensor number is evaluated for both a linear array and a M × N sensor matrix. Experimental results for a three-sensor linear array and 2 × 1 sensor matrix are also presented.
Libo Yuan, Limin Zhou, Wei Jin, and M. S. Demokan, "Multiplexing of Fiber-Optic White Light Interferometric Sensors Using a Ring Resonator," J. Lightwave Technol. 20, 1471- (2002)