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Microstructured optical fiber based Fabrya??P??rot interferometer as a humidity sensor utilizing chitosan polymeric matrix for breath monitoring
摘要： This study reports a method for humidity sensing based on a specialty microstructured optical fiber (MOF). A suspended tri-core MOF was fabricated using the stack and draw technique. A low finesse sensing head was prepared by depositing a chitosan polymer matrix within the holes of the MOF, forming a Fabry-Pérot interferometer as a sensing platform while the chitosan film acts as the sensing material. The use of the probe for real-time breath monitoring was also successfully demonstrated. The probe possessed a maximum sensitivity of 81.05 pm/(%RH) for 90–95%RH range while the linear region of the sensor ranged from 70–95%RH. The temperature cross correlation was also experimented, and a lower influence of external temperature was observed. The probe shows an ultrafast response during human breath monitoring with a rising time and recovery time of 80 ms and 70 ms, respectively.
关键词： humidity sensing,chitosan polymeric matrix,breath monitoring,microstructured optical fiber,Fabry–Pérot interferometer
更新于2025-09-19 17:13:59
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Parallel Double-FPIs Temperature Sensor Based on Suspended-Core Microstructured Optical Fiber
摘要： A configuration based on a parallel double Fabry–Perot interferometers (FPIs) is experimentally demonstrated to enhance temperature sensitivity by Vernier-effect. Two separated FPIs constructed by suspended-core microstructured optical fiber (SCMF) are connected by a 3-dB coupler to form a parallel structure. FPI-2 is used for temperature sensing, while FPI-1 as a reference. With the temperature increasing from 40 oC to 220 oC, both the fine interference fringes and envelope have a linear redshift. This parallel double-FPIs configuration shows an enhanced temperature sensitivity of 153.8 pm/oC with an amplification factor M = 14.6. Moreover, since the free reference FPI-1 is away from the temperature sensing environment, this simple and novel parallel double-FPIs configuration provides good reversibility and stability during the heating and cooling processes.
关键词： suspended-core microstructured optical fiber,Vernier-effect,parallel structure,temperature sensing
更新于2025-09-16 10:30:52
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Highly sensitive magnetic field sensor based on mode coupling effect in microstructured optical fibers
摘要： A highly sensitive magnetic field sensor based on mode coupling effect in a microstructured optical fiber (MOF) was theoretically investigated by using the finite element method. Magnetic fluid with refractive index higher than silica was designed to be filled into one cladding air hole in MOF to form a defect core. The coupling wavelength between fiber core modes and defect core modes can be modulated by external magnetic field. Simulation results show that the measuring sensitivity of magnetic field and figure of merit reached 1620? pm/Oe, 0.081/Oe in x-polarized mode and 1790? pm/Oe, 0.045/Oe in y-polarized mode, respectively. Meanwhile, the intensity of magnetic field depicts a good linear relationship with the coupling wavelength for both orthogonal polarized directions in the range of 25–175.9 Oe. The performance of the designed magnetic field sensor can be improved by optimizing the structural parameters in MOF.
关键词： Microstructured optical fiber,Mode coupling,Magnetic field sensor,Magnetic fluid
更新于2025-09-16 10:30:52
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[IEEE 2019 IEEE Photonics Conference (IPC) - San Antonio, TX, USA (2019.9.29-2019.10.3)] 2019 IEEE Photonics Conference (IPC) - Temperature-Independent Bending Sensor Based on Hollow Core Microstructured Optical Fiber
摘要： A temperature-independent bending sensor is proposed and developed based on hollow core microstructured optical fiber (HC-MOF). The device consists of a section of HC-MOF sandwiched by two segments of single mode fibers with the central-alignment. The nonlinear bending response is simulated and demonstrated experimentally.
关键词： fiber sensor,bending sensor,microstructured optical fiber
更新于2025-09-11 14:15:04
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Implications of theoretical analysis to explore the functional core dimension in one-rod core microstructured optical fibers
摘要： A new development in optical fiber technology that has attracted interest for multitude of novel and potential applications is an all-in-silica microstructured optical fibre (MOF) with one-rod core. We aim to estimate the functional core dimension for one-rod core triangular MOF (T-MOF) from its geometrical characteristics by using an alternative analytical field model. Moreover, to scrutinize the validity of the choice of effective core dimension (by adapting V-parameter, i.e., the normalized frequency) for T-MOF, we have explored the rudimentary propagation characteristics of the T-MOF in single mode guidance realm. We made comparisons with those which are based on the experimental and numerical studies. Relative errors are also reported.
关键词： One-rod core,Fundamental mode,Microstructured optical fiber,Effective index,Optimization,Single mode
更新于2025-09-11 14:15:04