Dr. Weijun Tong Profile

Dr. Weijun Tong

at Yangtze Optical Fiber and Cable Co Ltd

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Author

Publications (16)

Proceedings Article | 12 March 2021 Paper

Special active fiber for high power lasers

Yue Meng, Wei Jun Tong, Wei Zheng, Xu Dong Shi, Li Zhong, Chen Yang, Xin Ben Zhang, Song Wang

Proceedings Volume 11763, 117639R (2021) https://doi.org/10.1117/12.2588196

KEYWORDS: Cladding, Structured optical fibers, Fiber lasers, Fluorine, Absorption, Ytterbium, Silica, Signal attenuation, Refractive index, High power lasers

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Proceedings Article | 10 April 2020 Presentation + Paper

Temperature sensor based on selective liquid-filled twin-core photonic crystal fiber

Chenlu Wang, Perry Ping Shum, Dora Juan Juan Hu, Zhilin Xu, Shuhui Liu, Yongwei Zhu, Yu Zheng, Baocheng Li, Yang Chen, Weijun Tong, Yue Meng, Georges Humbert

Proceedings Volume 11354, 113542U (2020) https://doi.org/10.1117/12.2556997

KEYWORDS: Temperature sensors, Photonic crystal fibers, Optofluidics

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We experimentally demonstrated a temperature sensor by selectively infiltrating refractive index liquid (RIL) in the central air hole of a twin-core photonic crystal fiber (PCF). The selective liquid infiltration was realized by putting the PCF in the bulk liquid with its central air hole open for liquid infiltration using capillary effect. The rest of the air holes were covered by UV glue. The three-dimensional stage was used to translate the PCF, and a tapered SMF was used to transfer the UV glue to cover the air holes under the microscope. After UV glue was solidified by exposing the fiber end under the UV light, the PCF end was dipped into the RIL to fill the central air hole by capillary effect. Due to the large thermos-optic coefficient of the RIL, the RIL filled air channel would act as a liquid core whose core modes would be highly dependent on the ambient temperature. The core modes of the RIL filled core would be phase matched to the fundamental mode of the two solid cores. Therefore, the phase matching wavelengths for the mode coupling among the two solid cores of PCF and the liquid core were highly temperature sensitive. The resonant dips in the transmission spectrum were measured to estimate the temperature sensitivity. The experiment used a commercially available twin core PCF, and blocked all but the central airhole at one of the ends facets by UV glue (NOA81, Norland), the remaining open holes are infiltrated over a length of 10 cm by capillary force with fluid (Cargille Laboratories Inc. index-matching fluid, series A) that possesses a refractive index of 1.46 at 589.3nm, 25°C, and the thermal coefficient is – 0.000389 RIU/°C, which is around 10 times of that coefficient of silica. Any temperature induced changes will have an influence on the propagation properties because of the highly temperature response of the refractive index of the fluid. With a fiber cleaver, a 1.8 cm long PCF was then cut from the longer length of the partially liquid filled twin core PCF and then fusion spliced with SMFs at both ends to observe its transmission spectrum when the sample is heated. When the temperature increase to around 54°C, the liquid RI drops quickly to match that of silica, and a three parallel waveguide structure is formed, in which the central liquid waveguide have the same index value with the two solid core. Because of the small separation between adjacent waveguides, a strong mode-field overlap occurs, which leads to a significant enhancement of the coupling coefficient, therefore, light energy can be easily transferred between two solid cores and the liquid rod in a short coupling length. Thus, the transmission spectrum of the device contain two sets of interference fringe pattern, the large spectrum envelope originated from the interference between the three eigenmodes generated by three-parallel waveguide structure based on the mode coupling theory, and fine interference fringes generated by the interference between the higher order modes in one core. By tracking the dip wavelength shift of the large spectrum envelope, the sensor exhibited a high temperature sensitivity of up to 37.011 nm/°C within the temperature range from 53.8°C to 55°C due to the satisfaction of phase match condition, and maintain a high sensitivity of 19.681 nm/°C from 55°C to 58.2°C, which is benefit from the high thermal optic coefficient of the selectively filled liquid in the twin core PCF.

Proceedings Article | 23 April 2017 Paper

Spatial-division multiplexed hybrid Raman and Brillouin distributed sensor employing multicore fiber

Zhiyong Zhao, Yunli Dang, Ming Tang, Li Duan, Meng Wang, Songnian Fu, Weijun Tong, Deming Liu

Proceedings Volume 10323, 103239C (2017) https://doi.org/10.1117/12.2267543

KEYWORDS: Raman spectroscopy, Multiplexing, Sensors, Raman scattering, Fiber optics sensors, Scattering, Single mode fibers, Temperature metrology, Laser scattering, Spatial resolution

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Proceedings Article | 23 April 2017 Paper

Few mode fibers based quasi-single mode Raman distributed temperature sensor

Hao Wu, Meng Wang, Tongqing Liu, Chen Yang, Weijun Tong, Songnian Fu, Ming Tang

Proceedings Volume 10323, 103236D (2017) https://doi.org/10.1117/12.2263426

KEYWORDS: Signal to noise ratio, Signal processing, Electronic filtering, Optical fibers, Raman scattering, Temperature sensors, Spatial resolution, Fiber optics sensors, Fusion splicing, Temperature metrology, Reflectometry

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Proceedings Article | 17 May 2011 Paper

A photonic crystal fiber temperature sensor based on forward stimulated fluorescence emission

Xuejin Li, Xueming Hong, Yuanlong Deng, Yongqin Yu, Youfu Geng, Huifeng Wei, Weijun Tong

Proceedings Volume 7753, 77533T (2011) https://doi.org/10.1117/12.884942

KEYWORDS: Luminescence, Liquids, Temperature sensors, Photonic crystal fibers, Refractive index, Temperature metrology, Optical fibers, Fluorescent materials, Modulation, Bioalcohols

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Proceedings Article | 16 February 2011 Paper

Research on the FBG's high-temperature sustainability influenced by the doping process

Shuqiang Zhang, Feng Tu, Weijun Huang, Weijun Tong, Kun Zhu, Zhaolong Liao

Proceedings Volume 7894, 789403 (2011) https://doi.org/10.1117/12.871979

KEYWORDS: Fiber Bragg gratings, Doping, Boron, Reflectivity, Germanium, Optical fibers, Temperature metrology, Refractive index, Fiber characterization, Telecommunications

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Proceedings Article | 3 January 2011 Paper

Temperature stability of high Ge-doped fibre Bragg grating

Jiangtao Guo, Feng Tu, Huifeng Wei, Tao Deng, Weijun Tong

Proceedings Volume 7990, 79900D (2011) https://doi.org/10.1117/12.888632

KEYWORDS: Fiber Bragg gratings, Point spread functions, Optical fibers, Single mode fibers, Manufacturing, Sensors, Telecommunications, Reflectivity, Optical testing, Spectrum analysis

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Proceedings Article | 21 November 2007 Paper

Design of broadband dispersion compensating fiber with the small core photonic crystal fiber

Ming Wu, Hairong Liu, Dexiu Huang, Weijun Tong, Huifeng Wei

Proceedings Volume 6781, 67813U (2007) https://doi.org/10.1117/12.742195

KEYWORDS: Dispersion, Silica, Photonic crystal fibers, Single mode fibers, Solids, Cladding, Optoelectronics, Dense wavelength division multiplexing, Optical communications, Telecommunications

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Proceedings Article | 21 November 2007 Paper

An investigation of design, fabrication, and measurement for photonic crystal fibers

Weijun Tong, Huifeng Wei, Jie Luo, Qingrong Han, Honghai Wang, Raadjkoemar Matai

Proceedings Volume 6781, 67810Z (2007) https://doi.org/10.1117/12.741694

KEYWORDS: Optical fibers, Dispersion, Signal attenuation, Supercontinuum generation, Cladding, Photonic crystal fibers, Silica, Nonlinear optics, Process control, Phase shifts

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Proceedings Article | 4 October 2006 Paper

Investigation of low-loss and low-dispersion-slope highly nonlinear fibers and their application properties

Weijun Tong, Deming Liu, Ming Tang, Zhenbao He, Jie Luo

Proceedings Volume 6351, 63513L (2006) https://doi.org/10.1117/12.688085

KEYWORDS: Optical fibers, Raman spectroscopy, Signal attenuation, Silica, Nonlinear optics, Cladding, Raman scattering, Polarization, Deposition processes, Optical amplifiers

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Proceedings Article | 3 October 2006 Paper

Measurement of beat length of PANDA polarization maintaining fibers by differential group delay method

Wang Honghai, Tu Feng, Tong Weijun, Luo Jie, Liu Ying

Proceedings Volume 6351, 63510K (2006) https://doi.org/10.1117/12.686990

KEYWORDS: Optical fibers, Phase modulation, Polarization maintaining fibers, Error analysis, Birefringence, Polarization, Silica, Nondestructive evaluation, Refractive index, Single mode fibers

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Proceedings Article | 6 December 2005 Paper

Non-zero dispersion for wideband optical fiber

Zhenbao He, Weijun Tong, Jie Luo, Dexiou Huang

Proceedings Volume 6019, 601912 (2005) https://doi.org/10.1117/12.635639

KEYWORDS: Optical fibers, Signal attenuation, Dispersion, Dense wavelength division multiplexing, L band, Coarse wavelength division multiplexing, Cladding, Manufacturing, Waveguides, S band

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Proceedings Article | 6 December 2005 Paper

Fabrication of a long-length and low-loss PMF and measurement of its properties

Weijun Tong, Honghai Wang, Jie Luo, Deming Liu

Proceedings Volume 6019, 60190O (2005) https://doi.org/10.1117/12.629128

KEYWORDS: Polarization maintaining fibers, Optical fabrication, Optical properties, Fiber lasers, Gyroscopes, Cladding, Optical fibers, Geometrical optics, Laser optics, Polarization

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Proceedings Article | 28 April 2005 Paper

Study on the fabrication techniques of photonic crystal fiber and PCF based structures

Deming Liu, Weijun Tong, Shuang Liu, Hairong Liu

Proceedings Volume 5722, (2005) https://doi.org/10.1117/12.591286

KEYWORDS: Photonic crystal fibers, Capillaries, Refractive index, Fabrication, Optical fibers, Silica, Cladding, Waveguides, Fiber optic communications, Optical communications

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Proceedings Article | 10 January 2005 Paper

New type of wideband communication optical fiber with low water peak

Zhenbao He, Weijun Tong, Jie Luo, Shuqiang Zhang, Dexiou Huang

Proceedings Volume 5623, (2005) https://doi.org/10.1117/12.568369

KEYWORDS: Dispersion, Optical fibers, Signal attenuation, Dense wavelength division multiplexing, Multiplexing, Fiber optic communications, Optical communications, Manufacturing, Raman spectroscopy, Fiber characterization

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Proceedings Article | 30 April 2004 Paper

New type of communication optical fiber with S+C+L bands

Zhenbao He, Weijun Tong, Jie Luo, Shuqiang Zhang, Dexiou Huang

Proceedings Volume 5279, (2004) https://doi.org/10.1117/12.521884

KEYWORDS: Optical fibers, Signal attenuation, Dense wavelength division multiplexing, Optical communications, Optical design, Fiber optic communications, Nonlinear optics, Four wave mixing, Multiplexing, Optics manufacturing

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Showing 5 of 16 publications

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