Simultaneous Sensing of Mach-Zehnder Interferometer Optical Sensor Arrays Using Spatial Division Multiplexing

A simultaneous sensing of multiple Mach-Zehnder interferometer sensors is proposed by using spatial division multiplexing setup. Two MZI sensors were installed on a hardened steel bar to conduct a curvature measurement. The percentage differences observed in the sensors before and after the curvature test was carried out are 1.5% and 0.3%, respectively. The mapping of pristine to multiplexed sensor signal shows a regression coefficient, r2 of 96.16%. These results indicated that the SDM of MZI sensor arrays is reliable and repeatable.