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284 results on '"Zhao, Xuesong"'

3. A novel multicore Er/Yb co-doped microstructured optical fiber amplifier with peanut-shaped air holes cladding

Author

Zhang Yifan, Zhao Yifei, Fang Ziwei, Liu Jiantao, Xia Changming, Hou Zhiyun, Zhao Xuesong, Tan Zhongwei, Dong Yi, Zhou Guiyao, and Yuan Jinhui

Subjects
multicore fibers, microstructured optical fibers, doped fiber amplifiers, space-division multiplexing, Physics, QC1-999
Abstract

The multicore fiber amplifier, as a key component in spatial division multiplexing (SDM) communication systems, presents higher technical difficulty compared to traditional multi-channel single core fiber amplifiers, which has sparked widespread attention. To achieve balance, efficiency, miniaturization, and cost-effectiveness in the performance of multi-core optical fiber amplifiers, we propose an innovative triple cladding 13-core Er/Yb co-doped microstructured fiber (13CEYDMOF). The proposed fiber features an outer cladding with peanut-shaped air holes, which enables uniform excitation of the 13 cores using a single multimode laser pump source within the inner cladding. This approach also prevents damage or aging of the fiber’s outer coating due to the pump laser. Furthermore, the design of Peanut-Shaped Air Holes effectively increases the numerical aperture (NA) of the inner cladding while reducing the outer diameter of the fiber, enhancing the fiber’s mechanical flexibility. To address the coupling difficulties caused by air holes, we bi-directionally pump the 13CEYDMOFA by utilizing a combined technique of the side winding and end pumping. The experimental results show that the 13CEYDMOFA can achieve an average gain of 23.8 dB, a noise figure (NF) of ∼4.6 dB, and an inter-core gain difference of less than 2 dB in the wavelength range of 1529–1565 nm. The in-line amplified transmission experiment demonstrates that the 13CEYDMOFA is well suited for the 13 spatial channels transmission. To the best of our knowledge, this is the first time to realize high performance telecommunication band amplification in a multicore microstructure fiber.

Published
2024
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36. Crystal Step‐Induced Uniform and Rapid Deposition on Zinc Anodes.

Author

Yan, Mengdie, Zhao, Xuesong, Chen, Diancheng, Li, Wanxia, Liu, Liqi, Sun, Yang, Jiao, Shuhong, and Pan, Huilin

Subjects
*CHEMICAL kinetics, *ENERGY storage, *DENDRITIC crystals, *DISCONTINUOUS precipitation, *DENDRITES
Abstract

Aqueous Zn‐ion batteries have emerged as promising candidates for large‐scale energy storage owing to their high safety and low cost. However, dendrite growth and side reactions compromise the stability of the Zn anode in practical applications. Here, a novel Zn anode featuring well‐designed crystal steps along the (002) facets, referred to as Step‐Zn is introduced. The intersections of the (002) and (100) planes in these crystal steps create preferential adsorption sites for Zn2⁺ ions, promoting initial electro‐epitaxial growth of Zn that uniformly covers the crystal steps. This process effectively regulates subsequent Zn deposition, ensuring fast reaction kinetics and smooth morphology without dendrite formation. Consequently, the unique Step‐Zn anode exhibits excellent cycle life over 6000 times at 3 mA cm−2 and low greatly reduced polarization voltage under high areal currents and capacities. Integrated with activated carbon (AC) cathode, the Step‐Zn||AC full cell demonstrates excellent durability over 10 000 cycles at 5 A g−1. This work offers valuable insights into controlling Zn deposition modes by engineering the surface microstructure of Zn anodes with greatly extended cycling stability. [ABSTRACT FROM AUTHOR]

Published
2024
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46. Nonlinear phenomena in photonic nanostructures : modulational instabilities and solitons

Author

Zhao, Xuesong and Skryabin, Dmitry

Subjects
621.36, Nonlinear optics
Abstract

This thesis discusses nonlinear effects, such as modulation instability and solitons in nano-structured waveguides. The nanoscale optical waveguides have extremely small transverse dimensions, which can provide tight confinement of light. Therefore, by changing the waveguide geometry, the waveguide dispersion can be strongly altered. On the other hand, the confinement also enhances the nonlinear dispersion, allowing for nonlinear optical phenomena supported by dispersion of nonlinearity. The new models governing evolution of the amplitudes of components of the optical waves interacting in the waveguides are derived for continuous wave and pulse wave using perturbation expansion method. The new modulation instability condition is found, as we take into account the dispersion of nonlinearity which is enhanced through a strong variation of the modal profile with the wavelength of light in sub-wavelength waveguides. We demonstrate that this dispersion of nonlinearity can lead to the modulation instability in the regime of normal group velocity dispersion through the mechanism independent from higher order dispersions of linear waves for continuous wave. We address that the new mechanism highly associated with dispersion of nonlinearity in sub-wavelength semiconductor waveguide induces the modulation instability in picsecond regime together with the cascaded generation of higher-order sidebands. The impact of the dispersion of nonlinearity on spectral broadening of short pulses in a silicon waveguide also is considered. We study the temporal evolutions of fundamental and one-ring solitary waves with phase dislocation in dielectric-metal-dielectric waveguides with PT-symmetry and numerically analyze the properties of these nonlinear localized modes and, In particular, reveal different scenarios of their instability.

Published
2014

48. Study on mechanism and kinetics of iron removal by chlorination roasting of coal gangue.

Author

Zhang, Yuhan, Zhao, Xuesong, Shang, Baoyue, Wang, Xuesong, Wu, Xiulin, Chi, Shuang, and Li, Tingting

Subjects
ROASTING (Metallurgy), IRON, COAL, CHEMICAL reactions, RATE coefficients (Chemistry)
Abstract

Utilizing the abundant kaolin resources within coal gangue is economically beneficial, although the iron-containing phase in the minerals hampers the value of its utilization. In the present study, CaCl2 served as the chlorination agent for iron removal from coal gangue through chlorination roasting. The study revealed that when the roasting temperature is below 800 °C, CaCl2 decomposes into HCl and reacts with the iron content to form chloride, which then volatilizes. Comparatively, when the roasting temperature exceeds 800 °C, CaCl2 will decompose to produce HCl and Cl2 to accelerate the volatilization of iron. Through non-isothermal kinetic analysis, the apparent activation energy for iron removal by chlorination roasting of coal gangue was found to be 82.42 KJ/mol, and the pre-exponential factor was 6329.3 s−1. Correspondingly, isothermal kinetic analysis revealed the apparent activation energy of 84.2 KJ/mol and a pre-exponential factor of 6310.7 s−1. The optimal reaction kinetic mechanism function for iron removal through chlorination roasting of coal gangue was identified as the F3 chemical reaction order model via above kinetic analysis. The integral took the form g(α) = (1-α))2–1. [ABSTRACT FROM AUTHOR]

Published
2024
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