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Refractive index sensor based on ultrafine tapered single-mode nocladding single-mode fiber structure
摘要： A refractive index (RI) sensor based on a tapered no cladding fiber (NCF) is proposed theoretically and experimentally. The RI sensor is fabricated by splicing a NCF in the middle of two single mode fibers (SMF), and then the NCF is tapered to get lower waist diameter. Due to the lack of cladding, surrounding refractive index (SRI) can directly affect the light propagation of NCF, and the decrease of diameter can further improve the RI sensitivity by strengthening the evanescent field. The sensitivity with different lengths and waist diameters of NCF is investigated. It is observed that there are different linear relationships in different refractive interval and the RI sensitivity increases obviously with the waist diameter decreasing, especially when it is below 30 μm. RI sensitivity of the sensor reaches 686 nm/RIU when the waist diameter is 13 μm and SRI is at the range of 1.333–1.350. The sensor can be widely used in biosensing for its simple operation and high sensitivity at low SRI.
关键词： Refractive index sensor,Multimode interference,No cladding fiber,Tapering
更新于2025-11-28 14:23:57
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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) - Fabrication and sensing characteristics of 2 μm long period fiber grating written in double cladding fiber by CO <sub/>2</sub> laser
摘要： We demonstrate the fabrication of long period fiber gratings (LPFGs) in double cladding fiber in mid-infrared wavelength. The experimental results show that the LPFGs with a resonance dip in mid-infrared wavelength have much higher sensitivity.
关键词： double cladding fiber,fiber sensor,Long-period fiber grating
更新于2025-09-16 10:30:52
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[IEEE 2017 IEEE Workshop on Recent Advances in Photonics (WRAP) - Hyderabad (2017.12.18-2017.12.19)] 2017 IEEE Workshop on Recent Advances in Photonics (WRAP) - Utilization of Segmented Cladding Fiber for the Generation of High Energy Femtosecond Pulse Trains
摘要： Generation of high-peak-power, femtosecond pulse train and pulse doublet has been numerically demonstrated by exponentially decreasing the dispersion along the length of the large-mode-area segmented-cladding fiber. Such pulse trains find applications in various nonlinear optical processes.
关键词： pulse doublet,femtosecond pulses,large mode area fiber,pulse train,Segmented cladding fiber
更新于2025-09-10 09:29:36