- 标题
- 摘要
- 关键词
- 实验方案
- 产品
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Liquid-Crystal-Filled Side-hole Fiber for High-Sensitivity Temperature and Electric Field Measurement
摘要： We propose a highly sensitive sensor based on a nematic liquid-crystal-filled side-hole fiber. The liquid crystal is precisely filled into an air hole of the optical fiber using a method of manually gluing in the fusion splicer. Due to the coupling between the liquid crystal waveguide and the fiber core, multiple response dips appear in the transmission spectrum of the device. When an external temperature or electric field variation is applied to the liquid crystal and its refractive index changes, the transmission spectrum of this device will shift accordingly. Temperature and electric field response tests were performed on the device in the experiment, and the obtained temperature and electric field sensitivities were as high as ?1.5 nm/°C and 3.88 nm/Vpp, respectively. For the exhibited advantages of being easy to manufacture, low cost, and high sensitivity, the proposed sensor is very promising for actual application in temperature or weak electric field monitoring.
关键词： liquid crystal,side-hole fiber,fiber optics sensors
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) - Two-way Optical Phase Comparison at 10 <sup>-21</sup> Level over 200-km fiber link
摘要： This works demonstrates an improved local two-way optical phase comparison method. Based on this scheme, we implement a real-time frequency comparison over a bi-directional 200-km fiber spool link with a Bi-EDFA. The achieved relative frequency stability is 9.7E-18 at 1 s integration time and reaches 1.4E-21 at 10,000 s.
关键词： Two-way Comparison,Optical Phase Transfer,Local Measurement,Fiber Optics,Fiber Network
更新于2025-09-16 10:30:52
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High-resolution temperature sensor based on intracavity sensing of fiber ring laser
摘要： The principle and design of high-resolution sensors are of great significance in the development of fiber-optic sensors. In this paper, a general method based on intracavity sensing of fiber ring laser (FRL) for high-resolution measurement, and a high-resolution temperature sensing system is experimentally demonstrated. The theoretical model for intracavity sensing of FRL is presented. In the sensing system, a fiber-optic Sagnac loop is inserted into an FRL for temperature measurement, which performs as the filter and sensing head simultaneously. Because the filter characteristics of the Sagnac loop is modulated by temperature, the intracavity intensity-modulated sensing is induced for the output power of the FRL. With the method based on intracavity sensing, the temperature resolution level of the sensing system has been improved from 10-3 °C to 10-6 °C. The stability and measurement errors are also measured. The proposed method can be extensible to similar fiber-optic sensors to improve measurement resolution.
关键词： Fiber optics sensors,fiber lasers,high resolution
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) - Supercontinuum generation from PCF directly pumped by DSR laser with kW-level peak power
摘要： We proposed and experimentally demonstrated an all-fiber supercontinuum (SC) source with pump power independent spectral distribution by directly pumping dissipative soliton resonance (DSR) pulses with kW-level peak power into photonics crystal fiber (PCF).
关键词： Dissipative soliton resonance,supercontinuum generation,nonlinear fiber optics
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) - Uniform-Multilevel Amplitude Regeneration using a Polarization-orthogonal Continuous-wave-light-assisted Nonlinear-optical Loop Mirror
摘要： We experimentally investigate a multilevel amplitude regeneration of NRZ-PAM4 signals using a novel continuous-wave-light-assisted polarization-orthogonal nonlinear-optical loop mirror (PC-NOLM) subsystem, which creates the uniform noise-suppression behavior on multiple amplitude levels.
关键词： Signal regeneration,PAM,NOLM,Sagnac effect,Fiber optics communications
更新于2025-09-16 10:30:52
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[OSA Optical Fiber Sensors - Lausanne (2018..-..)] 26th International Conference on Optical Fiber Sensors - Combined temperature and RI sensor for exploring the phase transitions of ethanol solutions
摘要： A fiber optic interferometer based on core diameter mismatch is used in reflection mode to study the behavior of ethanol solutions with regards to concentration dependent thermal properties and phase transitions. A method to simultaneously measure both temperature and ethanol concentration in systems with non-linear sensitivities has been developed and characterized.
关键词： fiber optics sensors,interferometry
更新于2025-09-16 10:30:52
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A chaotic state in the transition from single- toward multiple pulse for soliton fiber lasers
摘要： High-order soliton in anomalous-dispersion ultrafast fiber lasers is rarely researched due to its intrinsic instability in dissipative systems. For the first time, we numerically demonstrate the ultrafast pulse in fiber lasers will deviate from the fundamental soliton under strong pulse energy before splitting into multiple pulses. High-order soliton effect results in the single-pulse splitting into the dual-pulse. Sustaining switching between the single- and dual-pulse induced by the high-order soliton evolution and cross-gain-modulation was observed and analyzed. The results offer significant and novel insights for the soliton shaping dynamics and instability in anomalous-dispersion fiber lasers.
关键词： Mode-locked lasers,nonlinear fiber optics,temporal soliton and pulse propagation
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) - Comparison of SC Fibers for fs Ti:Sapphire Based Hyperspectral CARS Microscopy
摘要： Hyperspectral coherent anti-Stokes Raman scattering (CARS) microscopy is a rapidly developing field enabling label-free, chemically selective bio-imaging based on Raman signatures. A significant factor limiting its clinical application is the complexity of current laser sources. A solution immediately relevant to two-photon excited fluorescence imaging laboratories is coherently broadening a fs Ti:Sapphire laser seed in a fiber to provide the Raman wavelengths via spectral-focusing (SF) CARS. The NKT fiber with two Zero Dispersion Wavelengths (ZDWs) is one option but the spectrum exhibits low Power Spectral Density (PSD) because of the large (>800 nm) spectral broadening. Here we perform the first systematic comparison sweeping (i) input pump power, (ii) pump wavelength and (iii) fiber length comparing the coherent SC from a femtoWHITE-CARS (2 ZDWs) fiber, a fiber with one ZDW offset above the seed wavelength, and an all-normal dispersion (ANDi) fiber. Starting with the seed laser polarisation aligned to a principal fiber axis, we show the total experimentally measured spectral output and importantly the polarisation resolved spectral component on the orthogonal axis, which is a measure of the nonlinear power-dependent depolarisation. This orthogonal component will degrade the efficiency of the CARS signal but still contributes to the bio-toxicity that limits the maximum power for imaging. Finally, we show representative SF-CARS microscopy images to showcase the power of this technique.
关键词： fiber optics,spectral-focusing,Ti:Sapphire laser,Hyperspectral CARS microscopy,supercontinuum generation
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) - Simultaneous measurement of temperature and pressure based on Fabry Perot and Antiresonant mechanisms
摘要： A fiber-optic sensor for simultaneous measurement of temperature and pressure is proposed and experimentally demonstrated. The sensor is composed of a hollow core fiber (HCF) sandwiched by two segments of single mode fiber (SMF), in which Fabry-Perot interference (FPI) combined with antiresonant (AR) mechanism are applied to the simultaneous measurement of temperature and pressure. The reflection spectrum of the sensor is composed of a sinusoid caused by axial FPI and several resonant wavelengths induced by AR mechanism occurred in cladding of the HCF. Two kinds of mechanisms have different responses to temperature and pressure, so the proposed sensor can simultaneously measure the pressure and temperature without pressure-temperature cross-talk. The advantages of the proposed sensor including small size, compact structure, and easy fabrication.
关键词： Fabry-Perot,Temperature and pressure sensor,Antiresonant,Fiber optics
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) - High-Sensitive All-Fiber Fabry-Perot Interferometer Gas Refractive Index Sensor Based on Lateral offset Splicing and Vernier Effect
摘要： Abstract—A high-sensitivity all-fiber Fabry-Perot interferometer (FPI) gas refractive index (RI) sensor based on lateral offset splicing and Vernier Effect is proposed. The sensing head consist of a reference FPI and a sensing FPI. A reference FPI and the sensing FPI is connected by two circulators. The sensing FPI is an open cavity made by lateral offset splicing of single mode fibers (SMFs), and the reference FPI is spliced by SMF and fiber tube. The Cascaded double-cavity produces a Vernier Effect and improves the sensitivity of gas RI. Experimental results show that the sensor has a high gas RI sensitivity of 16335.96 nm/RIU. The sensor has broad application prospects in gas composition detection, environmental monitoring, biosensors and other fields.
关键词： Fabry-Perot Interferometer,Fiber Optics Sensors,Vernier Effect,Gas Refractive Index Measurement
更新于2025-09-16 10:30:52