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1 March 2019 Highly sensitive FBG-based low-strain sensing system using carrier-suppressed phase modulation
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A highly sensitive and high resolution Interrogation setup for Fiber Bragg Grating (FBG) based sensing to measure low strain variation (i.e ~100με) effectively is being proposed in this manuscript. This system uses edge detection interrogation scheme using two optical signals generated through carrier compressed modulation scheme. Here, Dual Drive Mach-Zehnder Modulator (DD-MZM) is employed to generate carrier suppressed first order sidebands, which are then used as two optical signals and detected on two different power meters. Differential power measurement technique is used to calculate change in wavelength or applied strain at detector end. This system can provide system sensitivity as high as 0.3193 dBm.με-1 and resolution upto 31.31nε in term of strain or 37.2fm in terms of wavelength. Which is much higher than present commercially available interrogation system (~0.8με). The proposed interrogation system can be employed in biomedical sensing to monitor cardiac and respiratory activity even during Magnetic Resonance Imaging (MRI) scanning condition as they are not prone to any electromagnetic interference.
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Abhinaav Gautam, Amitesh Kumar, Ritu Raj Singh, and Vishnu Priye "Highly sensitive FBG-based low-strain sensing system using carrier-suppressed phase modulation", Proc. SPIE 10917, Terahertz, RF, Millimeter, and Submillimeter-Wave Technology and Applications XII, 1091723 (1 March 2019);

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