IEEE Sensors Journal · 2012 · 82 citations · 20 references
EngineeringBioengineeringMaterials ScienceOptical MaterialsPhotonicsSensorsFiber OpticsOptical FibersOptical MetrologyOptical SensingOptical SensorsRefractive IndexFiber SensorsFiber-optic SensingFiber-optic SensorsFibersMach-zehnder InterferometersOptical Fiber SensorsRefractive Index SensingSingle-mode Fibers
An in-fiber Mach-Zehnder interferometer (MZI) for high-sensitive refractive index (RI) measurement is proposed and experimentally demonstrated. The sensing head is formed by a single-mode fiber (SMF) sandwiched between two short sections of thin-core fibers (TCFs), i.e., TCF-SMF-TCF MZI configuration with a length of 9 mm. A well-defined interference pattern is obtained as the result of fiber-core mismatch and core-cladding modes interference. The selected interference dip is extremely sensitive to ambient RI, providing a stable RI response with sensitivity up to 159 nm/RIU for water-based solutions close to the RI of 1.33, making it a good candidate for bio-chemical measurements.
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High temperature fiber sensor with high sensitivity based on core diameter mismatch
Linh V. Nguyen, Dusun Hwang, Sucbei Moon et al. · Optics Express · 2008 · 409 citations · Full text