Polarization multiplexed interrogation technique for FBG sensor array

Abstract

This paper proposes a polarization multiplexed interrogation technique for fiber Bragg grating (FBG) sensor array. The novelty of the proposed model is its ability to reduce interference and cross talk, thus allowing larger number of FBG sensors to be interrogated in an array. The calibration technique has been illustrated in this work for the FBG sensor array, where data from each sensor are linearly polarized and multiplexed before co-propagation, to find out the tapping points that enable identification of each sensor data uniquely. Simulation has been carried out for odd number and even number of sensors in an array. Even with interfering input, this proposed scheme can interrogate and distinctively identify each sensor data using appropriate tuning of polarization-splitter, polarization-rotator, and polarization-attenuator at the detector end during the calibration process. The significance of the proposed method is its compact size, which makes this calibration system ready to be deployed in real-time sensing applications and data acquisition from the FBG sensor array.

A Comprehensive Study of Optical Fiber Acoustic Sensing

“…Combining with demodulation algorithm, the array multiplexing technology enables the system to have the ability of multi-channel synchronous demodulation [107], thus improving the detection performance of the whole hydrophone array. Typical multiplexing technologies include time division multiplexing [108], frequency division multiplexing [109], dense wavelength division multiplexing [110], and polarization multiplexing [111], among which dense wavelength division multiplexing technology evolved in the development of optical fiber communication technology. Comparing these reuse technologies, the degree of reuse is different, and the technical difficulty of implementation is also different.…”

A Multiplexing Optical Temperature Sensing System for Induction Motors Using Few-Mode Fiber Spatial Mode Diversity

“…Monitoring of the motor's temperature involves comprehensive measurements at multiple points, where the multiplexing method of fiber grating becomes crucial. For the common FBG sensor system with single-mode fiber, in order to achieve high-precision multipoint measurements, various multiplexing techniques have been proposed, such as wavelength division multiplexing (WDM) [18], time division multiplexing (TDM) [19], spatial division multiplexing (SDM) [20], and hybrid multiplexing [21]. Among them, AWG-based FBG interrogation for the WDM system is the most widely used [22][23][24][25].…”