11 results on '"Haifeng Xuan"'
Search Results
2. Polarimetry fiber optic gyroscope
- Author
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Xu Liu, Xiaojun Chen, Xin Zhao, X. Steve Yao, Huanhuan Zou, and Haifeng Xuan
- Subjects
Physics ,business.industry ,Polarimetry ,Gyroscope ,02 engineering and technology ,Fibre optic gyroscope ,021001 nanoscience & nanotechnology ,Polarization (waves) ,01 natural sciences ,Atomic and Molecular Physics, and Optics ,law.invention ,010309 optics ,Interferometry ,symbols.namesake ,Optics ,Fiber optic sensor ,law ,0103 physical sciences ,symbols ,Stokes parameters ,0210 nano-technology ,business ,Phase modulation - Abstract
We report a different mechanism for rotation sensing by analyzing the polarization of light exiting from a Sagnac loop. Unlike in an interferometric fiber optic gyroscope (I-FOG), here the counter-propagating waves in the Sagnac loop are orthogonally polarized at the loop exit and, consequently, cannot directly interfere with each other when recombined at the exit. We show that the Stokes parameters s2 and s3 of the combined waves are simply the cosine and sine functions of the phase difference between the counter propagation waves, which is linearly proportional to the rotation rate, allowing precise determination of the rotation rate by polarization analysis. We build such a proof-of-concept polarimetry FOG and achieved key performance parameters comparable to those of a high-end tactical-grade gyroscope. In particular, the device shows a bias instability of 0.09°/h and an angular random walk of 0.0015°/h, with an unlimited dynamic range, demonstrating its potential use for rotation sensing. This new approach eliminates the need for phase modulation required in I-FOGs, and promotes easy photonics integration, enabling the development of low-cost FOGs for price-sensitive applications, such as autonomous and robotic vehicles.
- Published
- 2019
3. Porous polymer optical fiber fabrication and potential biomedical application
- Author
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Ai Lin Chin, Gary Pickrell, Yuanyuan Guo, Rong Tong, Haifeng Xuan, Anbo Wang, Xiaoting Jia, and Li Yu
- Subjects
All-silica fiber ,Optical fiber ,Materials science ,Plastic-clad silica fiber ,technology, industry, and agriculture ,02 engineering and technology ,Microstructured optical fiber ,equipment and supplies ,010402 general chemistry ,021001 nanoscience & nanotechnology ,01 natural sciences ,Buffer (optical fiber) ,0104 chemical sciences ,Electronic, Optical and Magnetic Materials ,law.invention ,law ,Composite material ,0210 nano-technology ,Plastic optical fiber ,Hard-clad silica optical fiber ,Photonic-crystal fiber - Abstract
In this paper we propose a new and cost-effective fabrication scheme for porous polymer optical fibers. Different porous polymer fibers made from polycarbonate (PC) and poly(methyl methacrylate) (PMMA) using this method have been thermally drawn and characterized. Porosity in the fiber cladding is introduced by the absorbed water in one layer of the polymer fiber preforms under heat treatment and/or thermal drawing, and can be controlled by adjusting the water concentration. In addition, we have shown that the fabricated porous polymer fibers have the potential application in localized drug delivery for cancer treatment.
- Published
- 2017
4. Polarization converters in highly birefringent microfibers
- Author
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HaiFeng Xuan, Jun Ma, Wa Jin, and Wei Jin
- Subjects
Materials science ,business.product_category ,Birefringence ,business.industry ,Bandwidth (signal processing) ,Finite difference ,Polarization (waves) ,Atomic and Molecular Physics, and Optics ,Optics ,Fiber Bragg grating ,Beam propagation method ,Microfiber ,business ,Matrix method - Abstract
A novel type of polarization converters (PCs) based on highly birefringent (Hi-Bi) microfibers is presented. Analytical formulation based on the Jones Matrix method and a numerical code based on the Full Vectorial Finite Difference Beam Propagation Method are developed to analyze the polarization evolutions in such PCs. Two different design configurations, namely the “one-side” and “two-side” perturbation configurations, are studied by use of the two methods, and the results obtained agree well with each others. The PCs can be flexibly designed to have different operating wavelengths, spectral bandwidths, and devices lengths. A particular PC based on an elliptical microfiber demonstrates a bandwidth of ∼ 600 nm around 1550 nm with a device length of ∼ 150 μm.
- Published
- 2014
5. Design and analysis of large-core single-mode windmill single crystal sapphire optical fiber
- Author
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Anbo Wang, Gary Pickrell, Haifeng Xuan, Bo Liu, Cary Hill, Zhihao Yu, Yujie Cheng, and Daniel S. Homa
- Subjects
Materials science ,Optical fiber ,business.industry ,General Engineering ,Single-mode optical fiber ,02 engineering and technology ,Cladding (fiber optics) ,01 natural sciences ,Graded-index fiber ,Stripping (fiber) ,Atomic and Molecular Physics, and Optics ,law.invention ,010309 optics ,020210 optoelectronics & photonics ,Optics ,law ,Fiber optic sensor ,0103 physical sciences ,0202 electrical engineering, electronic engineering, information engineering ,Sapphire ,Optoelectronics ,Crystal optics ,business - Abstract
We present a large-core single-mode “windmill” single crystal sapphire optical fiber (SCSF) design, which exhibits single-mode operation by stripping off the higher-order modes (HOMs) while maintaining the fundamental mode. The “windmill” SCSF design was analyzed using the finite element analysis method, in which all the HOMs are leaky. The numerical simulation results show single-mode operation in the spectral range from 0.4 to 2 μm in the windmill SCSF, with an effective core diameter as large as 14 μm. Such fiber is expected to improve the performance of many of the current sapphire fiber optic sensor structures.
- Published
- 2016
6. Modal reduction in single crystal sapphire optical fiber
- Author
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Gary Pickrell, Anbo Wang, Yujie Cheng, Daniel S. Homa, Cary Hill, Bo Liu, Haifeng Xuan, and Zhihao Yu
- Subjects
All-silica fiber ,Optical fiber ,Materials science ,business.industry ,Plastic-clad silica fiber ,General Engineering ,Cladding (fiber optics) ,Graded-index fiber ,Atomic and Molecular Physics, and Optics ,law.invention ,Optics ,law ,Fiber optic sensor ,Sapphire ,Optoelectronics ,business ,Hard-clad silica optical fiber - Abstract
A new type of single crystal sapphire optical fiber (SCSF) design is proposed to reduce the number of guided modes via a highly dispersive cladding with a periodic array of high and low index regions in the azimuthal direction. The structure retains a “core” region of pure single crystal (SC) sapphire in the center of the fiber and a “cladding” region of alternating layers of air and SC sapphire in the azimuthal direction that is uniform in the radial direction. The modal characteristics and confinement losses of the fundamental mode were analyzed via the finite element method by varying the effective core diameter and the dimensions of the “windmill” shaped cladding. The simulation results showed that the number of guided modes were significantly reduced in the “windmill” fiber design, as the radial dimension of the air and SC sapphire cladding regions increase with corresponding decrease in the azimuthal dimension. It is anticipated that the “windmill” SCSF will readily improve the performance of current fiber optic sensors in the harsh environment and potentially enable those that were limited by the extremely large modal volume of unclad SCSF.
- Published
- 2015
7. Highly birefringent optical microfibers
- Author
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Jian Ju, Haifeng Xuan, and Wei Jin
- Subjects
All-silica fiber ,Optical fiber ,Birefringence ,Materials science ,Miniaturization ,Light ,business.industry ,Plastic-clad silica fiber ,Single-mode optical fiber ,Polarization-maintaining optical fiber ,Models, Theoretical ,Polarization (waves) ,Atomic and Molecular Physics, and Optics ,law.invention ,Refractometry ,Optics ,law ,Computer-Aided Design ,Scattering, Radiation ,Computer Simulation ,business ,Hard-clad silica optical fiber ,Optical Fibers - Abstract
Highly birefringent (Hi-Bi) air-clad silica microfibers (MFs) with wavelength and sub-wavelength scale transverse dimensions are studied theoretically and experimentally. Hi-Bi MFs are taper-drawn from the standard SMF-28 single mode fibers that are "pre-processed" by "cutting away" parts of the silica cladding on opposite sides of the fiber with a femtosecond infrared laser. Such Hi-Bi MFs have approximately elliptical cross-sections and are approximated by a three-layer model comprising a small central Ge-doped region surrounded by an elliptical silica region and an air-cladding. Theoretical modeling shows that phase and group birefringence of the order 10(-2) can be achieved with such air-clad Hi-Bi MFs. Experiments with an air-clad elliptical fiber with a major diameter of 0.9 microm and a minor/major diameter ratio of 0.9 demonstrated a group birefringence of approximately 0.015, agreeing well with the theoretical predictions. The Hi-Bi MFs are useful for micron/nanoscale polarization maintaining transmission and phase-sensitive interferometric sensors.
- Published
- 2010
8. Robust microfiber photonic microcells for sensor and device applications
- Author
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Haifeng Xuan, Wa Jin, Chao Wang, Wei Jin, and Yiping Wang
- Subjects
Photons ,Birefringence ,Optical fiber ,business.product_category ,Materials science ,business.industry ,Equipment Design ,Grating ,Atomic and Molecular Physics, and Optics ,law.invention ,Refractometry ,Interferometry ,Optics ,law ,Microfiber ,Fiber Optic Technology ,Optoelectronics ,Photonics ,business ,Refractive index ,Optical Fibers ,Photonic-crystal fiber - Abstract
We report the fabrication of in-line photonic microcells (PMCs) by encapsulating tapered microfibers (MFs) inside glass tubes. The encapsulation isolates MFs from external environment and makes them more suitable for real-world applications. Based on PMCs with encapsulated highly birefringent (Hi-Bi) MFs, we demonstrated pressure, temperature and refractive index (RI) sensors as well as long period grating devices. A fiber Sagnac loop interferometer incorporating a Hi-Bi microfiber PMC demonstrated RI sensitivity of 2024 nm per RI unit (nm/RIU) in gaseous environment and 21231 nm/RIU in water.
- Published
- 2014
9. CO_2 laser induced long period gratings in optical microfibers
- Author
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Wei Jin, Haifeng Xuan, and Min Zhang
- Subjects
All-silica fiber ,Optics and Photonics ,Optical fiber ,Materials science ,business.product_category ,law.invention ,Optics ,Fiber Bragg grating ,law ,Tensile Strength ,Fiber laser ,Materials Testing ,Microfiber ,Fiber Optic Technology ,Optical Fibers ,business.industry ,Lasers ,Temperature ,Equipment Design ,Laser ,Atomic and Molecular Physics, and Optics ,Refractometry ,Lasers, Gas ,Computer-Aided Design ,Optoelectronics ,business ,Refractive index ,Photonic-crystal fiber - Abstract
Long period gratings (LPGs) are fabricated by use of focused high frequency CO(2) laser pulses to periodically modify the transverse dimension of silica microfibers. A 20-period LPG with a 27 dB attenuation dip is realized in a microfiber with a diameter of approximately 6.3 microm. The resonant wavelength has a negative temperature coefficient and a high sensitivity to external refractive index. The microfiber LPGs may be useful in micron scale in-fiber devices and sensors.
- Published
- 2009
10. In-fiber polarimeters based on hollow-core photonic bandgap fibers
- Author
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Wei Jin, Jian Ju, Yanbiao Liao, Haifeng Xuan, and Min Zhang
- Subjects
Optics and Photonics ,Optical fiber ,Materials science ,Physics::Optics ,Biosensing Techniques ,law.invention ,Optics ,Fiber Bragg grating ,law ,Oscillometry ,Fiber Optic Technology ,Photons ,Birefringence ,business.industry ,Lasers ,Temperature ,Equipment Design ,Carbon Dioxide ,Polarizer ,Polarization (waves) ,Atomic and Molecular Physics, and Optics ,Interferometry ,Fiber optic sensor ,Optoelectronics ,Crystallization ,business ,Polarography ,Photonic-crystal fiber - Abstract
In-fiber polarimeters or polarization mode interferometers (PMIs) are fabricated by cascading two CO2-laser-induced in-fiber polarizers along a piece of hollow-core photonic bandgap fiber. Since the two interfering beams are the orthogonal polarizations of the fundamental mode, which are tightly confined to the core and have much lower loss than higher order modes, the PMIs can have either short (e.g., a few millimeters) or long (tens of meters or longer) device length without significantly changing the fringe contrast and hence provide design flexibility for applications required different device lengths. As examples of potential applications, the PMIs have been experimentally demonstrated for wavelength-dependent group birefringence measurement; and for strain, temperature and torsion sensors. The PMI sensors are quite sensitive to strain but relatively insensitive to temperature as compared with fiber Bragg grating sensors. The PMIs function as good directional torsion sensors that can determine the rate and direction of twist at the same time.
- Published
- 2009
11. Long period gratings in air-core photonic bandgap fibers
- Author
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Hoi Lut Ho, Dongning Wang, Wei Jin, Jian Ju, Haifeng Xuan, Yiping Wang, and Limin Xiao
- Subjects
PHOSFOS ,Materials science ,Optical fiber ,business.industry ,Physics::Optics ,Microstructured optical fiber ,Long-period fiber grating ,Atomic and Molecular Physics, and Optics ,law.invention ,Optics ,Fiber Bragg grating ,law ,Optoelectronics ,business ,Refractive index ,Photonic-crystal fiber ,Photonic crystal - Abstract
Long period fiber gratings in hollow-core air-silica photonic bandgap fibers were produced by use of high frequency, short duration, CO2 laser pulses to periodically modify the size, shape and distribution of air holes in the microstructured cladding. The resonant wavelength of these gratings is highly sensitivity to strain but insensitive to temperature, bend and external refractive index. These gratings can be used as stable spectral filters and novel sensors.
- Published
- 2008
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