Gangding Peng's research while affiliated with University of South Wales and other places
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Publications (45)
As an important device in the application of terahertz (THz) technology, a THz filter has broad application prospects in the fields of THz communication, imaging, and sensing. In this paper, a THz filter based on grating structure laser-induced graphene (LIG)/ side polishing terahertz fiber composite structure is proposed. In the experiment, we ach...
The ytterbium doped yttrium aluminum garnet (YAG:Yb) crystal-derived silica fiber (YCDSF) was fabricated using the modified rod-in-tube (RIT) method. The distribution of elements and optical properties of the fiber samples were investigated through energy dispersive X-ray spectrometer (EDS), refractive index, transmission loss and photoluminescence...
Nonlinear optics has generated a wide range of applications in the fields of optical communications, biomedicine, and materials science, with nonlinear conversion efficiency serving as a vital metric for its progress. However, the weak nonlinear response of materials, high optical loss, and inhomogeneous distribution of the light field hamper the i...
Perimeter security intrusion monitoring, relying on Distributed Fiber Optic Vibration Sensing Systems (DVS), is prevalent, yet effectively identifying vibration signals remains a challenge. This paper introduces a method for intrusion event pattern recognition based on deep learning and multimodal feature fusion, facilitating automatic feature extr...
Three Er-doped fibers (EDFs) with different concentrations of Bi ions doping were fabricated by atomic layer deposition combined with modified chemical vapor deposition. The radiation-induced absorption (RIA) could be dramatically weakened by co-doping Bi. Especially, the RIA of Bi/Er co-doped fiber (BEDF) at 1300 nm was 56.0% lower than that of ED...
In this paper, the spatial spectral characteristics of partial discharge (PD) under different electrode models are mainly studied. In the initial corona discharge stage, the emission spectrum is mainly emitted by the N2(C3IIu→B3IIg) energy level transition of the N2 second positive band system. The spectrum is in the ultraviolet range of 294–436 nm...
Cerium-doped lutetium yttrium orthosilicate (LYSO:Ce) powder has been synthesized by the co-precipitation method. The influence of the Ce3+ doping concentration on the lattice structure and luminescence characteristics of LYSO:Ce powder was investigated by X-ray diffraction (XRD) and photoluminescence (PL). The XRD measurement indicates that the la...
The linear demodulation range and background noise of the Michelson interferometer system are investigated with a laser phase noise measurement system. We have theoretically and experimentally analyzed the performance of the interferometer system by changing the frequency modulation amplitude of the laser and the optical path difference (OPD) of th...
Partial discharge (PD) is a common defect to determine the quality of high-voltage power equipment insulation systems. Localization of PD is very important for equipment maintenance and risk assessment. A localization algorithm of received signal strength (RSS) using demodulating PD optical signal is proposed. This is base on the optical effects ca...
By examining the spectral and amplification characteristics of Er-doped silica fiber (EDSF) and Bi/Er co-doped silica fiber (BEDSF), an active doped silica fiber with broadband- and flat-gain is investigated. Results show that the bandwidth of BEDSF with a gain greater than 20 dB is approximately 50 nm. Moreover, in the entire C-band, the gain of B...
We demonstrate a non-intrusive dynamic monitoring method of oil well flow based on distributed optical fiber acoustic sensing (DAS) technology and the turbulent vibration. The quantitative measurement of the flow rate is theoretically acquired though the amplitude of the demodulated phase changes from DAS based on the flow impact in the tube on the...
This paper focuses on the preparation of cerium-doped yttrium aluminum garnet (YAG: Ce) powder with several concentration gradients via the sol-gel method by detecting its structural characteristics via X-ray diffraction (XRD) patterns and scanning electron microscope (SEM) to verify the generation of a complete crystal phase and evenly distributed...
This paper reports the comparative experimental study concerning the irradiation effects of gamma-ray and electron beam on fiber Bragg grating (FBG) and distributed feedback fiber laser (DFB-FL). The obvious reflection wavelength shifts are observed for FBGs and DFB-FLs without evident changes in reflectivity and bandwidth under the current experim...
Yttrium aluminum garnet (YAG) doped with Ce was synthesized via the co-precipitation method with ${\rm NH}_4{\rm HCO}_3$ N H 4 H C O 3 as the precipitant. The spectroscopic properties and the effects of the Ce doping concentration and sintering atmosphere on the crystal phase were investigated. The dosimeter of YAG:Ce phosphor material was prepared...
We fabricated a novel Pb/Bi co-doped silica optical fiber using an atomic layer deposition technique in conjunction with a modified chemical vapour deposition process. The fabricated fiber exhibits distinct absorption peaks at 690, 800, 1000 and 1377 nm. An ultra-broad luminescence band with a 10 dB bandwidth of 600 nm from 1050 nm to 1650 nm was a...
A vector magnetometer, composed of a side-polished single-mode-multimode-single-mode fiber structure coated with ferrofluids, is proposed and investigated. The side-polishing of the multimode fiber can expose the evanescent field to the surrounding ferrofluids, whose refractive index in the vicinity of the polished surface can be tuned by both the...
The combined effect of stimulated Raman scattering (SRS), four-wave mixing (FWM) and self-pulsation in optical fibers can be either beneficial or detrimental, depending upon a specific application. In this work, we report for the first time that, under watt-level CW pumping in a common-cavity Ytterbium/Raman random fiber laser, a significant wavele...
Using induced UV attenuation across a twisted fiber asymmetric core drawn from a 3D printed preform, linear fiber Bragg gratings (FBGs) are produced on one side of the core. By removing the twist, a helical grating with a period matching the twist rate is produced. Balancing the rate with the polarization beat length in a form birefringent fiber al...
The first results of the study on photobleaching and thermally induced recovery in Bi-doped phosphosilicate fiber have been presented. It was revealed that the rate of bleaching of phosphor-related Bi active center (BAC-P) becomes slower with the decrease of photon energy. The quadratic dependence of the bleaching rate of BAC-P on laser power is ob...
We present a simple and reliable method to successfully reconcile the average output power and pulse energy of the solid-state Raman yellow lasers. By virtue of the hybrid laser gain of Nd:YAG and Nd:YVO4 in an intracavity frequency-doubled Raman, much higher pumping is allowed and nearly linear polarized fundamental and Stokes waves can be deliver...
![(a) Absorption spectra of BEDF-Al-0, 1, 2, and 3 [8], measured by the...](publication/342090042/figure/fig1/AS:11431281253775665@1718931087658/a-Absorption-spectra-of-BEDF-Al-0-1-2-and-3-8-measured-by-the-traditional_Q320.jpg)
In this Letter, the impact of ${\rm{A}}{{\rm{l}}_2}{{\rm{O}}_3}$ A l 2 O 3 doping on the Bi active center (BAC) photobleaching is investigated in Bi/Er-codoped fibers (BEDFs). By measuring the evolution of emission attributed to the BAC associated with silica (BAC-Si) at ${\sim} {{1400}}\;{\rm{nm}}$ ∼ 1400 n m , the linear relationship between the...
In this paper, a fiber optic Fabry–Perot (F-P) cavity high pressure sensor used in oil wells is presented. An F-P cavity probe encapsulated by silica capillary was fabricated through oxy-hydrogen flame welding, and the F-P cavity was fully sealed with adhesive-free bonding. A spiral tube filled with silicone oil was chosen to prevent the probe from...
Bismuth/erbium co-doped optical fiber fabricated through 3D silica lithography is thermally treated with various conditions. Then the thermal treatment effect on bismuth active centers (BACs) in this fiber is investigated. The thermal bleaching of the BAC associated with Al and the BAC associated with Si is observed after thermal treatment at high...
The cerium (Ce)-doped optical fiber materials show great applications in smart lighting, fiber laser, and high-energy ray and particle detection. A major challenge is the efficient prevention of Ce³⁺ oxidized to Ce⁴⁺ ions. Here we report the CO2-laser-heated drawing method for fabricating Ce:YAG derived scintillating optical fiber with a concentrat...
We carry out the experimental study on Brillouin erbium fiber laser in two different structure configurations. In the first configuration, Brillouin pump laser directly stimulates the Brillouin scattering light, whilst in the second it gets pre-amplification before stimulating the Brillouin scattering light in silica optical fiber. Employing distri...
The temperature dependency of erbium doped distributed feedback fiber laser output performance is experimentally and theoretically investigated with two major pump schemes. The output power declined linearly as temperature increased from 30°C to 120°C for 980nm and 1480nm pumped test laser while the later exhibited stronger heat susceptibility. Fur...
The effects of gamma ray (γ-ray) radiation and electron beam (e-beam) radiation on Rayleigh scattering coefficient in single-mode fiber are experimentally investigated. Utilizing an optical time domain reflectometry (OTDR), the power distribution curves of the irradiated fibers are obtained to retrieve the corresponding radiation-induced attenuatio...
Using an acousto-optic modulator of zero-order transmission as the Q-switch, single-frequency laser pulses were obtained in a ring cavity fiber laser with the seed injection technique. The acousto-optic modulator avoided the frequency-shift resulting from the RF driver signal in the first-order transmission. As the seed laser, a distributed-feedbac...
A surface plasmon resonance (SPR) refractive index (RI) sensor based on a D-shaped Hi-Bi photonic crystal fiber (PCF) is investigated with finite element method. Through changing the asymmetry of the fiber core along x- and y- axis, it is found that the Hi-Bi structure can greatly enhance the plasmon resonance at near-infrared wavelength, thus effe...
The thermal quenching effect has been systematically investigated in bismuth (Bi)-doped phosphogermanosilicate fiber with varying thermal conditions. For the first time, to the best of our knowledge, the activation of phosphor-related Bi active center (BAC-P) is achieved by thermal quenching at 400°C with a heating time of 10 min, evidenced by the...
The thermal activation of the bismuth active center associated with silicon (BAC-Si) in bismuth/erbium-codoped optical fiber (BEDF) has been investigated in terms of temperature, dwell time, and cooling rate. The experimental results show that temperature and dwell time have significant effects on activation of BAC-Si, and the underlying mechanism...
In this study, the influence of ytterbium ions (Yb³⁺) on the fluorescence lifetime of erbium (Er)-doped silica optical fiber (EDF) is investigated. An Er/Yb co-doped fiber is fabricated by modified chemical vapor deposition (MCVD), along with the atomic layer deposition (ALD) method. Moreover, the spectral properties of this fiber, such as absorpti...
Two-dimensional material tungsten diselenide (WSe 2) nanosheets are coated on a microfibre knot reso-nator (MKR) to achieve an all-optical power modulation functionality. On account of the strong absorption property of WSe 2 and the resonance enhancement properties of MKR, the transmitted optical power of signal light within the WSe 2-based MKR can...
The tungsten diselenide (WSe2) has attracted considerable interest owing to their versatile applications, such as p-n junctions, transistors, fiber lasers, spintronics, and conversion of solar energy into electricity. We demonstrate all-optical tuning of light in WSe2-coated microfiber (MF) using WSe2's broad absorption bandwidth and thermo-optic e...
In this letter, we propose a new scheme that combines a capillary tube with an elastic cavity to develop a thin fiber laser hydrophone (FLH) with static pressure equalization, enhanced dynamic pressure sensitivity and broadband flat response. We demonstrate the improvement on the hydrophone response characteristics by introducing the compensation s...
The effects of thermal annealing on the photoluminescence (PL) properties of bismuth/erbium co-doped multicomponent optical fiber (BEDFs) in a temperature range of from room temperature (RT) up to 1100 °C are clarified by PL, Transmission Electron Microscopy (TEM) and X-ray Diffraction (XRD) measurements. When pumped by an 830 nm laser diode, the f...
Sampled fiber grating for high-resolution time-domain signal processing is investigated. Sampled fiber grating is useful to introduce precise time delays in picosecond (ps) across many wavelength channels. We analyze and simulate for Sinc² sampled fiber grating, and show that a large number linear sub-ps time delays can be achieved by the grating....
In this paper we report the development and field test of a 16 channel high sensitivity fiber Bragg grating (FBG) geophone array for oil and gas exploration application. A high sensitivity FBG geophone is designed, and its sensitivity is about 1000pm/g. The wavelength change of the FBG geophone is interrogated by using interferometric demodulation...
A surface plasmon resonance sensor based on D-shaped dual-core photonic crystal fiber is designed. The plasma resonance intensity of this structure is obviously higher than that of the single core structure. The sensitivity on amplitude is numerically investigated.
Citations
... and 1556.0 nm, respectively. This trend closely matches the experimentally tested EDF absorption spectra [29,30], although with a margin of error of approximately 20∼30 nm. This very phenomenon may be attributed to the more complex dopant materials and local structure of experimentally prepared fibers. ...
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... DAS has been widely used for railroad health monitoring and tracking [27,29,27], border control and security applications [110]. Pipeline monitoring [111][112][113], cable monitoring (communication and power system) [114], and cement casting systems [115] are among the other application of the DAS systems. In environmental fields, underwater critical infrastructures [116], and various geophysical-seismic monitoring [117] have used the advantages of DAS. ...
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... A liquid phase method, such as the sol-gel method or the co-precipitation method, is commonly used to prepare powder materials. The agglomeration of powders prepared by sol-gel method is more serious [22], while the co-precipitation method has high preparation efficiency and good chemical uniformity of the powders. Therefore, the co-precipitation method was selected to prepare powder materials, and the luminescence and radiation properties of powders were studied. ...
... Radiation can cause a variety of effects in fiber lasers, including radiation-induced attenuation (RIA), radiation-induced scattering (RIS), and radiation-induced refractive index changes [5]. These effects can lead to a reduction in the laser's output power, changes in its spectral properties, and degradation of its optical components [6]. Overall, fiber lasers have great potential for use in radiation environments, but careful attention must be paid to their design and implementation to ensure that they can operate reliably in such harsh conditions. ...
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... When using CaSc2O4: Ce 3+ , this is a noteworthy result. As a consequence, our research suggests that CaSc2O4: Ce 3+ can enhance WLED color quality at low hue temperatures (5600K) and high hue temperatures (8500K) [15], [16]. ...
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... Bismuth-doped fiber amplifiers (BDFAs) have become the focus of research on new band amplifiers in recent years since they have been found to have a significantly wider amplification range and can achieve amplification at a wide range of wavelengths [5,6]. For instance, bismuth-doped materials with different doping systems have been shown to exhibit photoluminescence (PL) in the range of 1100-1800 nm [7][8][9]. In addition, as a rare Earth element (lanthanide), bismuth is a Phase VI element but belongs to the nitrogen group. ...
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... However, the deposition of gold layer using vacuum thermal evaporation method is indispensable in sample fabrication, which increases fabrication complexity and cost. Chen et al. reported a vector magnetic field sensor based on D-shaped MMF formed SMS fiber structure and MF [17]. While the proposed sensor is straightforward to fabricate and exhibits good measurement performance, the adoption of a hybrid fiber structure necessitates a shift towards a more simplistic and unified structure. ...
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... Thus, the YDF plays the role of the gain medium, as well as the saturable absorber self-modulating the losses, creating the impulsions as in a common passively Q-switched laser [16,17]. In the literature, self-pulsing laser sources have already been used for SC generation [17,18]. ...
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... [39,40] Therefore, 3D printing optical fiber technology enables a new generation of specialty optical fiber with materials and structures that have been impossible so far. In addition, these 3D printed specialty optical fibers will offer more opportunities and applications for the development of the specialty optical fiber devices, such as fiber sensors, [41,42] fiber filters, [43] and more. Especially, using the 3D printed Yb-doped microstructured silica optical fibers, Zheng et al. has demonstrated the high-temperature sensing in the temperature range of 23-380°C based on the fluorescence intensity ratio from doped Yb 3+ ions. ...
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... Three fiber samples with different concentrations of Bi ions doping fabricated by ALD combined with MCVD [20][21][22]. The main elemental components of the three fiber samples are measured by an electron probe micro-analyzer (EPMA-8050 G, SHIMADZU, Japan), as shown in Table 1. ...
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