Prof. Hao Zhang Profile

Prof. Hao Zhang

at Nankai Univ

SPIE Involvement:

Author

Publications (32)

SPIE Journal Paper | 30 January 2024

Performance of a superconducting nanowire single-photon detectors-based bi-directional communication system at ultra-low received optical power

Yifan Wang, Meng Guo, Xishan Jia, Yuan Yao, Hao Zhang, Bo Liu, Shaoxiang Duan, Haifeng Liu, Wei Lin

OE, Vol. 63, Issue 01, 018104, (January 2024) https://doi.org/10.1117/12.10.1117/1.OE.63.1.018104

KEYWORDS: Signal detection, Telecommunications, Pulse signals, Optical communications, Nanowires, Superconductors, Signal attenuation, Fiber optic communications, Video, Modulation

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SPIE Journal Paper | 7 July 2022

In-line microfluidic sensor based on dual S-taper fiber interferometer for measurement of glucose concentration

Miaoling Yang, Yuan Yao, Hao Zhang, Xiangqian Hu, Wei Lin, Bo Liu, Haifeng Liu

OE, Vol. 61, Issue 07, 077101, (July 2022) https://doi.org/10.1117/12.10.1117/1.OE.61.7.077101

KEYWORDS: Glucose, Sensors, Microfluidics, Interferometers, Environmental sensing, Single mode fibers, Optical engineering, Cladding, Fiber optics sensors, Capillaries

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Proceedings Article | 27 March 2022 Paper

Self-temperature compensation approach for fiber specklegram magnetic field sensor based on polarization specklegram analysis

Shicheng Hu, Haifeng Liu, Bo Liu, Wei Lin, Hao Zhang, Binbin Song, Jixuan Wu

Proceedings Volume 12169, 121697B (2022) https://doi.org/10.1117/12.2624988

KEYWORDS: Polarization, Magnetism, Magnetic sensors, Sensors, Fiber optics sensors, Multimode fibers

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SPIE Journal Paper | 26 May 2021

Design of a magnetically tuned terahertz orbital angular momentum mode in air-clad microstructured optical fibers integrated with liquid crystals

Ying Liang, Hao Zhang, Wei Lin, Shanshan Li, Yuehui Wang, Bo Liu

OE, Vol. 60, Issue 05, 056107, (May 2021) https://doi.org/10.1117/12.10.1117/1.OE.60.5.056107

KEYWORDS: Terahertz radiation, Liquid crystals, Refractive index, Magnetism, Optical microcavities, Structured optical fibers, Optical engineering, Microresonators, Telecommunications, Modulation

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Proceedings Article | 10 October 2020 Poster + Paper

Highly dispersive Ge-doped coupled ring fiber for high-order OAM modes

Wenpu Geng, Yuxi Fang, Yingning Wang, Yiqiao Li, Changjing Bao, Hao Zhang, Hao Huang, Yongxiong Ren, Zhongqi Pan, Yang Yue

Proceedings Volume 11547, 1154716 (2020) https://doi.org/10.1117/12.2573535

KEYWORDS: Fiber couplers, Dispersion, Silica, Multiplexing, Optical communications, Telecommunications, Optical fibers, Refractive index, Finite element methods

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Proceedings Article | 10 October 2020 Poster + Paper

Ge-doped air-core ring fiber supporting >400 radially fundamental OAM modes across O, E, S, C, L bands

Yingning Wang, Wenqian Zhao, Yuxi Fang, Wenpu Geng, Changjing Bao, Zhi Wang, Hao Zhang, Hao Huang, Yongxiong Ren, Zhongqi Pan, Yang Yue

Proceedings Volume 11547, 115471L (2020) https://doi.org/10.1117/12.2575109

KEYWORDS: L band, Data communications, Wavelength division multiplexing, Multiplexing, Fiber optic communications, Optical networks, Space division multiplexing, Wavefronts, Wave propagation, Structured optical fibers

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SPIE Journal Paper | 17 September 2020

Strain and temperature sensor based on S-taper embedded in long-period grating

Meiqi Li, Ye Cao, Hao Zhang, Wenwen Wu, Bo Liu, Ting Liu, Shaoxiang Duan, Yange Liu

OE, Vol. 59, Issue 09, 097105, (September 2020) https://doi.org/10.1117/12.10.1117/1.OE.59.9.097105

KEYWORDS: Sensors, Temperature metrology, Temperature sensors, Cladding, Optical fibers, Fiber optics sensors, Single mode fibers, Optical engineering, Environmental sensing, Interferometers

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SPIE Journal Paper | 6 February 2020

Laser-tuned whispering gallery modes in microbottle silica resonators based on azobenzene-doped polyvinyl alcohol film

Congzhou Liang, Hao Zhang, Bo Liu, Haifeng Liu, Jixuan Wu

OE, Vol. 59, Issue 02, 027103, (February 2020) https://doi.org/10.1117/12.10.1117/1.OE.59.2.027103

KEYWORDS: Microresonators, Coating, Resonators, Laser resonators, Wavelength tuning, Silica, Laser applications, Optical engineering, Molecules, Optical pumping

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SPIE Journal Paper | 9 July 2019

Intensity-interrogated magnetic field sensor with resolved temperature cross sensitivity based on down-fusion taper and S-taper integrated with magnetic fluids

Wenwen Wu, Ye Cao, Hao Zhang, Bo Liu, Xu Zhang, Shaoxiang Duan, Ting Liu, Yange Liu

OE, Vol. 58, Issue 07, 077102, (July 2019) https://doi.org/10.1117/12.10.1117/1.OE.58.7.077102

KEYWORDS: Magnetism, Magnetic sensors, Sensors, Cladding, Fiber optics sensors, Temperature metrology, Structured optical fibers, Fiber optics, Interferometry, Optical engineering

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SPIE Journal Paper | 1 February 2017

All-fiber electric field sensor based on whispering-gallery-mode resonances in U-bent single-mode fibers integrated with liquid crystal

Ningning Gu, Hao Zhang, Bo Liu, Wei Lin, Binbin Song, Jixuan Wu

OE, Vol. 56, Issue 02, 026102, (February 2017) https://doi.org/10.1117/12.10.1117/1.OE.56.2.026102

KEYWORDS: Polarization, Liquid crystals, Electric field sensors, Single mode fibers, Optical fibers, Sensors, Fiber optics sensors, Optical engineering, Scattering, Fiber optics

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Proceedings Article | 28 September 2015 Paper

Magnetic-field sensor based on tapered all-solid waveguide-array fiber and magnetic fluids

Yinping Miao, Jia Mao, Jixuan Wu, Wei Lin, Binbin Song, Kailiang Zhang, Hao Zhang, Bo Liu

Proceedings Volume 9634, 96346W (2015) https://doi.org/10.1117/12.2194549

KEYWORDS: Magnetism, Magnetic sensors, Refractive index, Waveguides, Fiber optics sensors, Sensors, Fiber optics, Single mode fibers, Optical fibers, Nanoparticles

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Proceedings Article | 28 September 2015 Paper

Magnetic field sensor based on fiber taper coupler coated with magnetic fluid

Wei Lin, Hao Zhang, Binbin Song, Bo Liu, Yandong Lin, Haifeng Liu, Yinping Miao, Yange Liu

Proceedings Volume 9634, 96347U (2015) https://doi.org/10.1117/12.2191929

KEYWORDS: Magnetism, Magnetic sensors, Fiber couplers, Sensors, Fiber coatings, Fiber optics sensors, Head, Refractive index, Structured optical fibers, Electronic components

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Proceedings Article | 28 September 2015 Paper

Ultrahigh sensitive twist sensor employing Sagnac interferometer based on PM-elliptical core fibers

Binbin Song, Bo Liu, Wei Lin, Yinping Miao, Hao Zhang, Jixuan Wu, Haifeng Liu, Donglin Yan

Proceedings Volume 9634, 963453 (2015) https://doi.org/10.1117/12.2190828

KEYWORDS: Optical fibers, Birefringence, Sensors, Sagnac interferometers, Photoelasticity, Single mode fibers, Electronic components, Electronics engineering, Fiber optics sensors

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SPIE Journal Paper | 21 July 2015

Acousto-optic fiber interferometer based on concatenated flexural wave modulation

Shouxin Kang, Hao Zhang, Bo Liu, Ning Zhang, Yinping Miao

OE, Vol. 54, Issue 07, 076106, (July 2015) https://doi.org/10.1117/12.10.1117/1.OE.54.7.076106

KEYWORDS: Acoustics, Acousto-optics, Interferometers, Cladding, Modulation, Interferometry, Optical fibers, Refractive index, Optical engineering, Light wave propagation

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An acousto-optic fiber interferometer has been proposed and experimentally demonstrated by employing two MgF2 sandwiches to implement concatenated flexural acoustic wave modulation onto single-mode optical fibers. The transmission spectrum of the acoustic grating pair has been experimentally investigated. Experimental results indicate that interferometric spectral fringes possess a frequency sensitivity as large as −499.0 nm/MHz due to the Mach–Zehnder interference. Moreover, the applied radio frequency signal voltage for flexural wave generation has a great impact on the transmission spectral properties. The work presented would be of importance for the understanding of the acousto-optic interaction mechanism in concatenated acoustic fiber gratings and is helpful for the design of related acousto-optic fiber devices.

Proceedings Article | 2 June 2014

Magnetic field tunability of square tapered no-core fibers

Yinping Miao, Jixuan Wu, Wei Lin, Kailiang Zhang, Binbin Song, Hao Zhang, Bo Liu

Proceedings Volume 9157, 91577Z (2014) https://doi.org/10.1117/12.2059275

KEYWORDS: Magnetism, Optical fibers, Refractive index, Single mode fibers, Photonic devices, Fusion splicing, Electronic components, Electronics engineering, Silica, Waveguides

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A magnetic-field-tuned photonics device based on magnetic fluid (MF) and a square tapered no-core fiber (NCF) sandwiched between two single-mode fibers (SMFs) has been proposed. The enhanced evanescent field effect in the NCF is achieved by tapering the square NCF utilizing a fusion splicer. The spectral dependence of the proposed device on the applied magnetic-field intensity has been investigated. The results indicate that a maximal sensitivity of -18.7pm/Oe is obtained for a magnetic field strength ranging from 25Oe to 450Oe. The proposed tunable device has several advantages, including low cost, ease of fabrication, compact structure, and high sensitivity.

SPIE Journal Paper | 20 March 2013

Acoustic birefringence suppression in a fiber acoustic grating employing solid-core photonic crystal fiber with hexagonal air-hole array cladding

Minghui Qiu, Hao Zhang, Bo Liu, Hongguang Dong, Chunxue Yang, Yinping Miao

OE, Vol. 52, Issue 03, 035008, (March 2013) https://doi.org/10.1117/12.10.1117/1.OE.52.3.035008

KEYWORDS: Acoustics, Birefringence, Cladding, Photonic crystal fibers, Acousto-optics, Modulation, Single mode fibers, Aluminum, Tunable filters, Optical fibers

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An acoustic birefringence suppression scheme for acoustic fiber gratings has been proposed and experimentally demonstrated. Experimental observation of the transmission characteristics of the single-mode-fiber-based (SMF-based) acoustic grating confirms that introduction of one segment of solid-core photonic crystal fiber (PCF) with air-hole array in the cladding region helps to eradicate resonance peak splitting induced by acoustic birefringence, which has been explained by our theoretical analysis from the acoustic wave modulation method and fiber cross-section structure. Moreover, experimental results indicate that the introduction of the solid-core PCF does not have a considerable impact on the frequency dependence of resonance wavelength for the SMF-based acoustic fiber grating, which ensures the performances of the PCF-assisted SMF-based acousto-optic tunable filter for practical applications.

Proceedings Article | 17 October 2012

Dynamic temperature compensation interrogation technique for liquid level sensors array based on single-longitudinal-mode DBR fiber laser

Chenglai Jia, Bo Liu, Hao Zhang, Yinping Miao

Proceedings Volume 8421, 842159 (2012) https://doi.org/10.1117/12.975234

KEYWORDS: Sensors, Liquids, Fiber lasers, Fiber Bragg gratings, Temperature metrology, Multiplexing, Polarimetry, Fiber optics sensors, Polarization, Birefringence

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A polarimetric DBR fiber laser sensor array for simultaneous measurement of liquid level and temperature has been proposed and experimentally demonstrated. Operation principle of the proposed DBR fiber laser sensor has been theoretically analyzed. Based on beat frequency/wavelength hybrid interrogation, discrimination between liquid level and temperature has been achieved. Furthermore, three fiber laser sensors were cascaded to build up a serially multiplexed sensor array, showing a good multiplexing capability for potential network applications.

Proceedings Article | 31 January 2012

Bend response of weakly tilted Bragg grating inscribed in all-solid photonic band-gap fibers

Yinping Miao, Bo Liu, Kailiang Zhang, Xiaoyun Zhu, Yan Liu, Xingya Chen, Hao Zhang

Proceedings Volume 8351, 835116 (2012) https://doi.org/10.1117/12.912809

KEYWORDS: Optical fibers, Fiber Bragg gratings, Refractive index, Cladding, Modulation, Sensors, Photonic crystal fibers, Ultraviolet radiation, Electronic components, Electronics engineering

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Weakly tilted fiber Bragg gratings (W-TFBGs) with a certain tilted angle are inscribed in the Ge-doped cladding rods of all-solid photonic band-gap fibers (AS-PBGF) by UV illumination. There are couplings not only forward-propagating LP₀₁ mode to counter-propagating LP01 mode but also the couplings to counter-propagating high order supermodes based on tilted refractive index modulation. The responses of the W-TFBGs to temperature and bend are investigated. The results indicate that the resonance peaks will shift red-side with increasing temperatures, and the sensitivities of different resonance peaks are very close in the same grating. When the bend is applied, the grids of W-TFBG will be compressed or stretched. Two resonance peaks will shift with increasing curvatures, which is related to the orientation of curvature. Therefore, it is potential to work as a directional bend sensor. For the fiber grating with high-order supermodes coupling, it could form fiber grating array by different levels. If every grating has individual response to surrounding, such a single W-TFBG could be used for one point and multi-parameter measurement. In addition, this work provides some insights into the mechanisms that contribute to the measured properties of TFBG in the photonic crystal fiber. It is also an effective method to investigate supermode properties of photonic crystal fiber.

Proceedings Article | 29 November 2011

Multilongitudinal-mode fiber laser temperature sensor and its applications in the measurement of temperature dependence of fiber birefringence

Hao Zhang, Bo Liu, Yange Liu, Yinping Miao, Xingya Chen, Yunqi Liu

Proceedings Volume 8311, 83110Q (2011) https://doi.org/10.1117/12.902974

KEYWORDS: Fiber lasers, Birefringence, Temperature metrology, Refractive index, Temperature sensors, Fiber Bragg gratings, Sensors, Active optics, Spectrum analysis, Polarimetry

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In this paper, an active temperature sensor based on beat frequency interrogation of a multilongitudinal-mode fiber laser has been proposed and demonstrated. Temperature measurement has been achieved through beat frequency interrogation of the proposed multilongitudinal mode laser. Experimental results show that the temperature sensing curve has good linearity with a coefficient of determination of 0.996004 for a temperature range of 30°C to 105.3°C. Furthermore, its application in the measurement of temperature dependence of fiber birefringence has been also investigated. And calculation results according to experimental observation of the beat frequency spectrum indicate that as temperature increases intrinsic fiber birefringence also linearly increases with a temperature coefficient of about 4.4x10^-10/°C. The proposed multilongitudinal-mode fiber laser sensor based on beat frequency interrogation has several advantages including compactness, high signal to noise ratio, etc, which is expected to be employed in future sensing applications.

Proceedings Article | 29 November 2011

Coupling characteristics of a fluid-filled dual-core photonic crystal fiber based on temperature tuning

Chengli Wei, Zhi Wang, Yange Liu, Bo Liu, Hao Zhang, Yunqi Liu

Proceedings Volume 8307, 83071R (2011) https://doi.org/10.1117/12.904218

KEYWORDS: Liquids, Refractive index, Photonic crystal fibers, Finite element methods, Polarization, Optoelectronics, Information science, Information technology, Specialty optical fibers, Optical networks

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The coupling characteristics of fluid-filled dual-core photonic crystal fibers are numerically investigated. The transmission spectrum is obtained in different temperatures. With the help of a vector finite element method we acquire the properties of the minimum coupling length. Finally, the coupling characteristic is experimental studied by the way of temperature tuning.

Proceedings Article | 17 May 2011

Intensity modulated temperature sensor based on the photonic crystal fibers filled with magnetic fluid

Yinping Miao, Yan Liu, Bo Liu, Kailiang Zhang, Hao Zhang, Qida Zhao

Proceedings Volume 7753, 775347 (2011) https://doi.org/10.1117/12.885325

KEYWORDS: Magnetism, Temperature sensors, Photonic crystal fibers, Refractive index, Modulation, Optical fibers, Tunable filters, Photonic devices, Waveguides, Liquids

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We propose a photonic crystal fiber (PCF) temperature sensor that is based on intensity modulation by magnetic fluid (MF) filling of air holes with index-guiding PCF. Temperature characteristic of MF-filled PCF is investigated without magnetic field and with weak magnetic field. The results show that light is still guided by total internal reflection (TIR) in this device because MF has a smaller refractive index than the material in the fiber core; the transmission power of the MF-filled PCF is used as the sensor signal to investigate its temperature properties. The temperature sensitivity of transmission power was experimentally determined to be 0.06dBm/oC for a 10cm-long PCF without applying magnetic field.

Proceedings Article | 12 February 2008

Fluorescence excitation spectroscopic imaging with a tunable light source and dimensionality reduction using FR-IsoMap

Kevin Koh, Tobias Wood, Hao Zhang, Karim Lekadir, Daniel Elson, Guang-Zhong Yang

Proceedings Volume 6848, 68480Z (2008) https://doi.org/10.1117/12.767923

KEYWORDS: Tissues, Luminescence, Collagen, Tissue optics, Digital Light Processing, Optical filters, Imaging spectroscopy, Fluorescence spectroscopy, Lung, Spectroscopy

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This paper presents an optical system for performing excitation resolved imaging of fluorescent dyes, tissue phantoms and ex vivo tissues. The excitation source was a supercontinuum generated in a highly nonlinear fibre, spectrally filtered using dispersive optics and a movable slit or digital micromirror device. This allowed excitation with multiple spectra, which may be chosen to optimize the fluorescence yield from a particular fluorophore, or to maximize discrimination between multiple labels. As an initial validation, the analysis of fluorescent dye solutions embedded in collagen gels in the presence of scatterers and absorbers by using fixed reference isomap (FR-IsoMap) is presented, followed by initial evaluation with human lung bronchial tissue. The proposed system has potential applications for in vivo fluorescence endoscopy of cancerous tissues through excitation spectral selection and analysis with FR-IsoMap.

Proceedings Article | 2 February 2006

Petri net based fiber Bragg grating sensing multiplexing technique

Hongwei Gao, Bo Liu, Hao Zhang, Jianhua Luo, Ye Cao, Shuzhong Yuan, Guiyun Kai, Xiaoyi Dong

Proceedings Volume 6031, 60310B (2006) https://doi.org/10.1117/12.667918

KEYWORDS: Fiber Bragg gratings, Sensors, Multiplexing, Sensing systems, Data acquisition, Switching, Optical switching, Demodulation, Wavelength division multiplexing, Channel projecting optics

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We bring forward a novel FBG sensor multiplexing technique based on Petri Net theory and the wavelength/spatial-division multiplexing technique. With this technique, the FBG sensing system not only avoid frequently switching and improve the average response speed, but also is able to enact data acquisition rule according to the priority (PRI), the delay time and the wavelength shift of FBG sensors. Therefore, the smart FBG sensors multiplexing system is more rational and smarter than the conventional WDM/SDM multiplexing technique. To validate the feasibility and advantage of the multiplexing technology, a FBG strain sensing system and theory simulation were proposed. The resolution power of the sensing system is 1με. The average delay time of the technique is lower one magnitude order than the conventional ones.

Proceedings Article | 10 January 2005

A Sagnac filter composed of high-birefringence loops

Lihui Liu, Luming Zhao, Guang Zhou, Hao Zhang, Shuyang Hu, Guiling Huang, Shiya He, Qida Zhao

Proceedings Volume 5623, (2005) https://doi.org/10.1117/12.571251

KEYWORDS: Optical filters, Mirrors, Birefringence, Manufacturing, Optical communications, Electronic filtering, Optical isolators, Fabry–Perot interferometers, Light, Spectrum analysis

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In this paper, a filter which is cascaded n-stage high-birefringence fiber loop mirrors is presented. The related theory is analyzed and an expression cascaded with n-stage high-birefringence fiber loop mirrors of output intensity is given. Since experiment results are consistent with simulation outcomes, our theory is proved. Compared with a single stage high-birefringence filter, the cascaded filter shows more complex transmission Characteristics. Therefore, this kind of filter is flexible transmission spectrum and low cost for manufacture.

Proceedings Article | 10 January 2005

Fiber grating pressure sensor with enhanced sensitivity

Lihui Liu, Qida Zhao, Weigang Zhang, Hao Zhang, Long Jin, Luming Zhao, Yu Yan, Shiyu Gao, Xiaoyi Dong

Proceedings Volume 5623, (2005) https://doi.org/10.1117/12.570762

KEYWORDS: Fiber Bragg gratings, Sensors, Temperature metrology, Polymers, Metals, Fiber optics sensors, Polymeric sensors, Thermal effects, Copper, Optical communications

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A novel pressure sensor with FBG partly packaged by a metal tube is presented. The thermal-strain cross effect can be avoided. Moreover, its pressure sensitivity is -2.44×10^-3/MPa with the range from 0 to 0.44 MPa, which is 1200 times as that of a bare fiber grating. The linearity of this sensor reaches 0.9986.

Proceedings Article | 10 January 2005

Temperature compensation for high-birefringence fiber loop mirror

Qida Zhao, Lihui Liu, Shaohua Chen, Luming Zhao, Hao Zhang, Yu Yan, Guiling Huang

Proceedings Volume 5623, (2005) https://doi.org/10.1117/12.571973

KEYWORDS: Mirrors, Optical filters, Birefringence, Glasses, Fiber optics sensors, Fiber optic communications, Fiber optics, Temperature metrology, Mach-Zehnder interferometers, Complex systems

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We propose a novel temperature compensation method that HBF is mounted on a piece of organic glass. It can lessen its temperature sensitivity to 0.059 nm/K, which are two orders of magnitude lower than that of an uncompensated HBF loop mirror. It is feasible that HBF loop mirror packaged with a large thermal-expansion material is insensitive to ambient temperature perturbation. This technique is beneficial to the practicality of loop mirror filter based fiber sensors.

Proceedings Article | 10 January 2005

An all-fiber electric voltage sensor based on high-birefringence fiber loop mirror

Hao Zhang, Bo Liu, Lingyun Xiong, Ling Yu, Qingying Dou, Shaohua Chen, Yange Liu, Lihui Liu, Shuzhong Yuan, Xiaoyi Dong

Proceedings Volume 5623, (2005) https://doi.org/10.1117/12.569984

KEYWORDS: Mirrors, Sensors, Refractive index, Ferroelectric materials, Birefringence, Polarization, Phase shifts, Interferometers, Transmittance, Fiber optics sensors

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In this paper, an all-fiber electric voltage sensor based on high birefringence fiber loop mirror is presented. This voltage sensor is composed of a 3dB coupler and ~8m high birefringence (HiBi) fiber, part of which is affixed to a piezoelectric translator (PZT). When the voltage applied on the PZT changes, the transmission spectrum of this HiBi fiber loop mirror will shift accordingly. As the direct current voltage increases to 75.2V, the phase shift of this HiBi fiber loop mirror is nearly π rad and the transmission peak changes by about half of a period. This voltage sensor has a sensitivity of 0.004nm/V and its linearity reaches 0.99878. Moreover, we have theoretically studied transmission spectrum shift of this HiBi fiber loop mirror when the length and refractive index difference of HiBi fiber are altered.

Proceedings Article | 10 January 2005

A novel method to improve noise figure for double-pass L-band EDFA

Hao Zhang, Ling Yu, Yange Liu, Chao Wang, Lihui Liu, Lingyun Xiong, Shuzhong Yuan, Xiaoyi Dong

Proceedings Volume 5623, (2005) https://doi.org/10.1117/12.569517

KEYWORDS: Mirrors, L band, Optical amplifiers, Birefringence, Reflectors, Signal attenuation, Dense wavelength division multiplexing, Absorption, Reflectivity, Wavelength division multiplexing

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In this paper, we present a noise figure improved double-pass L-band EDFA based on HiBi fiber loop mirror as the ASE suppressor. By utilizing a HiBi fiber loop mirror as the wavelength-dependent reflector, the ASE light has been weakened to a large extend, which increases the inversion ion population at the input end of erbium-doped fiber. Therefore, the noise figure of this double-pass EDFA has been much improved. Compared with that of the conventional double-pass structure based on 3dB fiber loop mirror, the NF of our novel configuration is reduced by 2.06~5.33dB for the ten sampled signal wavelength (1580.84nm~1588.48nm).

Proceedings Article | 12 May 2004

Discretely tunable all-fiber Fabry-Perot laser based on birefringence fiber loop mirror and fiber Bragg grating

Hao Zhang, Ling Yu, Yange Liu, Lihui Liu, Shuzhong Yuan, Xiaoyi Dong

Proceedings Volume 5280, (2004) https://doi.org/10.1117/12.519429

KEYWORDS: Mirrors, Fiber Bragg gratings, Fiber lasers, Birefringence, Reflectivity, Wavelength division multiplexing, Tunable lasers, Telecommunications, Fabry–Perot interferometers, Optical communications

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In this paper, we present a novel structure discretely tunable linear cavity fiber laser. A fiber Bragg grating (FBG) and a high birefringence fiber loop mirror are used as cavity reflectors. By changing the deflection of an equivalent-strength beam, the reflective wavelength of the FBG can be tuned accordingly. Since the reflectivity of the HiBi fiber loop mirror varies periodically, the output laser of this Fabry-Perot laser based on HiBi fiber loop mirror and FBG can be tuned discretely. From 1543.8nm to 1555.2nm, 15-wavelength lasers (SMSR>54dB) with approximately 0.8nm spacing have been obtained and the output laser intensity reaches about 2.5dBm in average. Nevertheless, some 0.8nm spacing lasers much weaker than the above lasers have also been observed. And they are expected to be eliminated by using narrower linewidth FBG as reflective mirror.

Proceedings Article | 30 April 2004

Novel all-fiber variable optical attenuator based on high-birefringence fiber loop mirror

Hao Zhang, Yange Liu, Ling Yu, Lihui Liu, Guang Zhou, Shuzhong Yuan, Xiaoyi Dong

Proceedings Volume 5279, (2004) https://doi.org/10.1117/12.518802

KEYWORDS: Mirrors, Birefringence, Signal attenuation, Variable optical attenuators, Beam shaping, Polarization, Optical amplifiers, Optical communications, Telecommunications, Wavelength division multiplexing

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In this paper, we propose a novel all-fiber variable optical attenuator based on high birefringence fiber loop mirror. Part of the birefringence fiber was pasted onto an equivalent-strength beam and by applying a strain with a high precision screw thruster on the free end of the beam, we observed that the transmission spectrum of the fiber loop mirror shifted with nearly unaltered shape. The attenuation at 1551nm is more than 30dB with about 6dB insertion loss. By tuning the angle between the fast or slow axes of input and output planes of the birefringence fiber, the insertion loss of this VOA can be minimized to no more than 1.5dB. The wavelength shift of this VOA varies linearly (the linear correlation coefficient reaches 0.9979) with the deflection of the beam and it turns out good attenuation characteristics.

Proceedings Article | 23 August 2002

Theoretical studies on the gain characteristics for 1064-nm pumped thulium-doped fiber amplifier

Hongyun Meng, Zhigang Wu, Weiqing Gao, Hao Zhang, Shuzhong Yuan, Xiaoyi Dong

Proceedings Volume 4906, (2002) https://doi.org/10.1117/12.480605

KEYWORDS: Fiber amplifiers, Optical amplifiers, Absorption, Thulium, Optical fibers, Ions, Wavelength division multiplexing, Fiber lasers, Geometrical optics, Optical networks

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A group of equations deduced from thulium-doped fiber amplifier (TDFA) rate equations and light propagation equations, introducing the overlapping factors between the (pump and signal) light intensities and the thulium dopant distributions inside the fiber core, is presented in this paper. Using the group of equations, the small signal gain and optimum fiber length and threshold pump power characteristics ofthe amplifier are simulated.

Proceedings Article | 23 August 2002

Gain and noise characteristics of all-optical gain-clamped Fabry-Perot lasing erbium-doped fiber amplifier using fiber Bragg reflectors

Yange Liu, Hao Zhang, Shuzhong Yuan, Jian-guo Tian, Xiaoyi Dong

Proceedings Volume 4906, (2002) https://doi.org/10.1117/12.480611

KEYWORDS: Reflectivity, Optical amplifiers, Fiber Bragg gratings, Fiber amplifiers, Interference (communication), Fabry–Perot interferometers, Reflectors, Wavelength division multiplexing, Signal attenuation, Amplifiers

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In this paper, gain and noise characteristics of gain-clamped Fabry-Perot lasing erbium-doped fiber amplifier (EDFA) is investigated in detail when reflective wavelength and reflectivity of the fiber Bragg gratings (FBG) are selected different values. The relationships between gain and noise performance of the gain-clamped EDFA and the selection ofFBG parameters such as reflectivity and reflective wavelength are investigated and analyzed. It is found via numerical simulation that the selection of FBG parameters has important influence on the performance of the EDFA. The results obtained in this paper can provide significant datum and reference for optimizing and improving the performance of all-optical gain-clamped EDFA.

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