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S fiber taper-based fiber loop ring-down refractometer
摘要： A fiber-optic refractive index (RI) sensor based on fiber loop ring-down (FLRD) technique with an S fiber taper (SFT) structure is proposed and experimentally investigated. The SFT is served as an in-line Mach–Zehnder interferometer and inserted into a compensated fiber loop for RI measurement. By optimizing the parameters of the fiber loop, the quality of the ring-down signals is improved effectively. The surrounding refractive index can be conveniently measured by interrogating the ring-down time of the fiber loop. The experimental results demonstrate that the proposed sensor has a high sensitivity of ?3128.954 μs/RIU in the measurement range of 1.3330–1.3682. The proposed RI sensor combines the specialties of SFT interferometer and FLRD technology, which could be a good candidate in applications.
关键词： Fiber-optic sensors,fiber loop ring-down,S fiber taper,refractive index
更新于2025-09-23 15:22:29
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[IEEE 2019 18th International Conference on Optical Communications and Networks (ICOCN) - Huangshan, China (2019.8.5-2019.8.8)] 2019 18th International Conference on Optical Communications and Networks (ICOCN) - Supercontinuum Generation in Cascaded Photonic Crystal Fiber Tapers
摘要： In this paper, we propose two-stage cascaded photonic crystal fiber tapers for the supercontinuum (SC) generation. The nonlinear evolution of the SC generation is numerically investigated when pump pulses with different peak powers are used.
关键词： supercontinuum generation,Nonlinear,photonic crystal fiber taper
更新于2025-09-16 10:30:52
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[IEEE 2019 18th International Conference on Optical Communications and Networks (ICOCN) - Huangshan, China (2019.8.5-2019.8.8)] 2019 18th International Conference on Optical Communications and Networks (ICOCN) - Novel Magnetometer Basedon Magnetic Fluid Coated Whispering Gallery ode Resonator
摘要： This paper presents an optical concept based on magnetic field fluid (MF)-coated microsphere for magnetic field detection. As refractive index (RI) of MF can be magnetically tuned under different applied magnetic fields, resonance shift of spherical whispering gallery mode (WGM) resonator is used as measurement principle. Preliminary experimental result demonstrates that a magnetic field strength sensitivity of 5.036pm/mT can be achieved using a 42um diameter of MF-coated microsphere with a Q-factor of 0.78×105.
关键词： Whispering gallery mode Resonator,Magnetic Fluid,Sensitivity,Fiber Taper,Magnetic Field
更新于2025-09-16 10:30:52
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[IEEE 2019 Conference on Lasers and Electro-Optics Europe & European Quantum Electronics Conference (CLEO/Europe-EQEC) - Munich, Germany (2019.6.23-2019.6.27)] 2019 Conference on Lasers and Electro-Optics Europe & European Quantum Electronics Conference (CLEO/Europe-EQEC) - Spatial Kerr Beam Self-Cleaning in Yb-Doped Multimode Fiber Taper
摘要： Spatial Kerr beam self-cleaning (KBSC), which transforms an output speckled beam in a quasi-single mode beam in graded index (GRIN) multimode optical fibers (MMFs), has been reported recently [1,2]. GRIN MMFs are also interesting waveguides for supercontinuum (SC) generation in the visible and near infrared regions, as successfully demonstrated by launching femtosecond or subnanosecond pulses in the anomalous (1550 nm) or normal (1064 nm) dispersion regime, respectively [1,3]. The spectral broadening features were explained through the interplay between spatiotemporal multimode soliton oscillations and dispersive wave generation in fibers with parabolic index profile. On the other hand, tapered optical fibers are well known to provide a number of useful features, including strong mode confinement capability, small scale diameter and broad SC generation [4,5]. Herein, we report visible-short infrared SC generation in combination with KBSC in long (~10 m) tapered Yb-doped MMFs, with parabolic index profile and parabolic doping concentration.
关键词： supercontinuum generation,Spatial Kerr beam self-cleaning,graded index multimode optical fibers,Yb-doped multimode fiber taper
更新于2025-09-12 10:27:22