- 标题
- 摘要
- 关键词
- 实验方案
- 产品
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Optical fiber temperature sensor based on a Mach-Zehnder interferometer with single-mode-thin-core-single-mode fiber structure
摘要： A Mach-Zehnder interferometer for measurement of temperature is proposed and experimentally demonstrated, which consists of two sections of single mode fiber (SMF) and a section of thin core fiber spliced between the two SMFs. The two welding areas are heated and stretched to improve the split and recombination of light. The wavelength of the resonant dip will shift when temperature varies due to the thermo-optic and thermal expansion effect. The experimental results show that a temperature sensitivity of 65 pm/○C with a linear correlation coefficient of 0.996 can be achieved in a temperature range from 25 ○C to 80 ○C. Due to its ease of manufacture, low cost, and high sensitivity, the fiber optic temperature sensor is suitable for temperature measurement applications.
关键词： single-mode-thin-core-single-mode fiber structure,Mach-Zehnder interferometer,Optical fiber temperature sensor
更新于2025-09-19 17:13:59
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Rationality Modeling of 3D Scanning Image of Digital Print Laser Based on Block Matching Texture Information Repair
摘要： We experimentally investigate mutual information and generalized mutual information for coherent optical transmission systems. The impact of the assumed channel distribution on the achievable rate is investigated for distributions in up to four dimensions. Single channel and wavelength-division multiplexing (WDM) transmission over transmission links with and without inline dispersion compensation are studied. We show that for conventional WDM systems without inline dispersion compensation, a circularly symmetric complex Gaussian distribution is a good approximation of the channel. For other channels, such as with inline dispersion compensation, this is no longer true and gains in the achievable information rate are obtained by considering more sophisticated four-dimensional (4D) distributions. We also show that for nonlinear channels, gains in the achievable information rate can also be achieved by estimating the mean values of the received constellation in four dimensions. The highest gain for such channels is seen for a 4D correlated Gaussian distribution.
关键词： mutual Information,digital communication,fiber nonlinear optics,optical fiber communication,Channel models
更新于2025-09-19 17:13:59
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[IEEE IGARSS 2019 - 2019 IEEE International Geoscience and Remote Sensing Symposium - Yokohama, Japan (2019.7.28-2019.8.2)] IGARSS 2019 - 2019 IEEE International Geoscience and Remote Sensing Symposium - Accurate Ground Positioning Obtained From 3d Data Matching Between Airborne and Terrestrial Data for Ground Validation of Satellite Laser
摘要： We present a phase mask inscription technique with two beam interferometry using a lateral nonhomogeneous beam splitter to create gratings with nonhomogeneous periods, the so-called chirped fiber Bragg gratings. Inscription experiments with deep ultraviolet excimer and femtosecond laser sources reveal how this inscription method depends on the coherence properties of the inscription laser. Nonhomogeneous beam splitters are shown to provide a method to generate chirped fiber Bragg gratings with great wavelength versatility, even with the ultraviolet femtosecond laser.
关键词： two-beam interferometry,Femtosecond laser,fiber Bragg gratings,optical fiber filters
更新于2025-09-19 17:13:59
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[IEEE IGARSS 2019 - 2019 IEEE International Geoscience and Remote Sensing Symposium - Yokohama, Japan (2019.7.28-2019.8.2)] IGARSS 2019 - 2019 IEEE International Geoscience and Remote Sensing Symposium - Characterization of double-bounce scattering in RVoG scenarios using controlled HR-PolTomSAR experiments
摘要： We experimentally investigate mutual information and generalized mutual information for coherent optical transmission systems. The impact of the assumed channel distribution on the achievable rate is investigated for distributions in up to four dimensions. Single channel and wavelength-division multiplexing (WDM) transmission over transmission links with and without inline dispersion compensation are studied. We show that for conventional WDM systems without inline dispersion compensation, a circularly symmetric complex Gaussian distribution is a good approximation of the channel. For other channels, such as with inline dispersion compensation, this is no longer true and gains in the achievable information rate are obtained by considering more sophisticated four-dimensional (4D) distributions. We also show that for nonlinear channels, gains in the achievable information rate can also be achieved by estimating the mean values of the received constellation in four dimensions. The highest gain for such channels is seen for a 4D correlated Gaussian distribution.
关键词： fiber nonlinear optics,optical fiber communication,digital communication,Channel models,mutual Information
更新于2025-09-19 17:13:59
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Technology of Polymer Microtipsa?? Manufacturing on the Ends of Multi-Mode Optical Fibers
摘要： The technology of polymer microtips’ manufacturing on the ends of selected multi-mode fibers has been reported. The study’s key element was an extended description of technology parameters’ influence on the shape of these 3D microstructures. Basic technology parameters such as spectral characteristics of the light source, monomer mixture type, optical power, and exposure time were taken under consideration. Depending on those parameters, different shapes, sizes, and surface structures of microtips were obtained. The spectral characteristics of the light and optical power delivered to a monomer drop were identified as the most important parameters for the formation of the desired 3D shape of the microtip. Presented experimental results are the base for further studies directed to the application of these micro-elements in the fields of optical measurements and sensors’ technology.
关键词： photopolymerization,fiber optic element technology,material properties,optical fiber microtip
更新于2025-09-19 17:13:59
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Soliton generation in optical fiber networks
摘要： We consider the problem of soliton generation in branched optical fibers. A model based on the nonlinear Schrodinger equation on metric graphs is proposed. Number of generated solitons is computed for different branching topologies considering different initial pulse profiles. Experimental realization of the model is discussed.
关键词： optical solitons,optical fiber network,soliton transport,pulse generation
更新于2025-09-19 17:13:59
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co-doped microstructure optical fiber
摘要： A microstructure optical fiber with Yb +3 /Al +3 co-doped glass core is fabricated using high-temperature laser sintering process combined with stack-capillary-draw technology. No crystal is observed in the core glass and its fluorescence lifetime is measured to be 1.31 ms. The bonding features of glass and fiber, together with the structure of fiber core and cladding, are provided and analyzed. Moreover, the uniform element distributions and the axial stress profiles show a highly symmetrical variation trend which is in good agreement with the intensity distribution of Raman signal in Micro-Raman mapping. Excited by 976-nm LD, the laser slope efficiency of microstructure optical fiber reaches up to 72.5 % at 1032 nm. The near-field beam intensity distribution of fiber laser with spectrum FWHM of 8 nm exhibits an excellent laser beam quality. This work strongly suggests Yb +3 /Al +3 co-doped silica preform fabricated by high-temperature sintering method is applicable for the field of high-power laser.
关键词： Yb/Al,Microstructure optical fiber,Optical properties,Laser behavior
更新于2025-09-19 17:13:59
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Helical optical fiber sensing configuration for hyper-elastic soft surgical manipulators
摘要： Soft surgical manipulator is a research hotspot, but the sensing problem of hyper-elastic deformation needs to be solved urgently. In order to solve this problem, a helical optical fiber sensing method is proposed for the manipulator of hyper-elastic soft material. A FBG(Fiber Bragg Grating) sensor is embedded in a helical shape in the soft manipulator. In theory, the helical fiber sensing model is established. The reflectance spectra of the FBG sensor was measured when the soft manipulator was compressed or bent. The relationship between the center wavelength offset and the compression amount, the center wavelength offset and the bending angle, respectively, was analyzed. The results show that the compression of the soft manipulator is approximately liner to the shift of the center wavelength of the FBG in the range of 0–18 mm, and the bending angle of the soft manipulator is non-linear to the shift of the center wavelength of the FBG sensor. The helical fiber grating sensor has good consistency in many measurement experiments, and the fluctuation range of the deviation index is -35%-25%. The main idea of the thesis is feasible and provide a method of the posture sensing of the soft surgery manipulator.
关键词： Hyper-elastic material,Optical fiber sensing,Soft manipulator,Helical structure
更新于2025-09-19 17:13:59
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Fiber-based unidirectional emission with enhanced extraction efficiency of a single quantum dot from an optimized structure
摘要： III-nitride materials play a significant role in adjusting the emission of quantum emitters. In quantum networks, photons are used as flying qubits, and Gallium nitride (GaN) semiconductor quantum dots (QDs) have shown powerful single photon emission characteristics. Due to the high refractive index contrast of the semiconductor quantum dots, the extraction efficiency is low. In this paper, we numerically simulate the unidirectional emission quantum dot of InGaN formed on the apex of a silver-coated GaN nano-pyramid structure using FDTD software, and the structure is optimized to form an enhancement of extraction efficiency at a wavelength of 520 nm, its extraction efficiency has been improved from 91.35% to 97.2%. Most of the extracted light from the quantum dots is directed to the bottom of the pyramid with high directivity and incident into the single-mode optical fiber. The new structure is expected to be applied to unidirectional, bright and high extraction efficiency quantum emitters in quantum communication systems.
关键词： Collection efficiency,Pyramidal,Unidirectional emission,Single quantum emitter,Optical fiber,Quantum dots
更新于2025-09-19 17:13:59
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Lab-on-tip: Protruding-shaped all-fiber plasmonic microtip probe toward in-situ chem-bio detection
摘要： Lab-on-tip technology opens a new door for optical fiber surface plasmon resonance (SPR) sensors. In this paper, we first demonstrate an ultra-compact reflective SPR microtip probe on the flat fiber end in experiment, which has a length of tens of microns and a diameter of several microns. Simulations and experiments show that this new fiber SPR microtip probe coated with a nano-goldfilm has excellent refractive index (RI) sensing characteristic and great potential for biochemical detection at single cell level. Based on the high RI sensitivity, a bio-probe assembled with Chitosan/Polysodium Styrene Sulfonate (Cs/PSS) nano-polyelectrolyte film and the sheep anti-human IgG-HRP is prepared to recognize human IgG specifically. Due to the high surface sensitivity, the SPR microtip probe exhibits an ultra-low detection limit for human IgG. Due to the high bulk sensitivity and high thermo-optical coefficient (TOC) of polydimethylsiloxane (PDMS), a reference temperature probe based on SPR microtip is proposed, which is used to compensate for the temperature cross-sensitivity of the bio-probe. This new SPR microtip probe can be used not only in optical fiber sensor, but also in Tip-Enhanced Near-Field Raman Microscopy and Scanning Near-Field Optical Microscope.
关键词： Surface plasmon resonance,Optical fiber microtip,Refractive index detection,Antibody detection
更新于2025-09-19 17:13:59