The Reinforced Optical Fiber Sensing with bilayer AuNPs/SiC for pressure measurement: Characterization and Optimization

A cladding modified multimode optical fiber sensor reinforced with bilayers Au:SiC is designed and fabricated for pressure sensing in this presented. The Au thin film was used to enhanced the sensitivity of the sensor while the SiC thin film has been investigated as the reinforced layer at the sensing part to measure the wide range of applied pressure. The data acquisition interrogated using an optical time-domain reflectometer (OTDR). The results showed that the performance of the optical fiber sensor coated with bilayers Au:SiC coating is significantly improved in the measurement of applied pressure at the sensing part. Additionally, the sensor coated with bilayer Au:SiC exhibits linear variation in the return losses measured from OTDR trace with the wide range of applied pressure compare to the sensor coated with Au thin film. Where the maximum value in the sensitivity is equal to 35% dB/um of the sensor coated with bilayers SiC:Au compared to the sensitivity of the sensor coated with Au which equal to 30% dB/um. The high performance showed in results demonstrating that the fabricated optical fiber sensor has the excellent potential application as a sensor to measure a wide range of applied pressure without deform the sensing part.