Analysis of the Transmission Characteristics of Ultraviolet Communication in Non-Common-Scattering Volume
Jiang Xiaobo,
Gong Jiamin,
Li Chen,
Xu Jiachi,
Zhang Zhengjun
Issue:
Volume 7, Issue 2, December 2018
Pages:
61-67
Received:
16 July 2018
Accepted:
8 August 2018
Published:
6 September 2018
DOI:
10.11648/j.optics.20180702.11
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Abstract: This paper uses multiple scattering model based on Monte Carlo simulation to study the transmission characteristics of uv communication in non common scattering volume And theoretically analyze the performance of the omnidirectional full-duplex UV optical communication system. In the model, the variation of the average scattering times of uv light in the atmosphere, the variation of the path loss, the change of the pulse response time delay and signal to noise ratio (SNR) along with the transmission distance. And the variation of signal to noise ratio of full duplex communication system based on WDM technology are analyzed in the omnidirectional directional scattering case. The results show that unlike the case of a common scattering volume at least twice atmospheric scattering are required to reach. the receiving end in non-common-scattering volume model, The path loss and impulse response time delay with the same transmission distance for the non public scattering transmission model is much higher than those the common scattering volume transmission model. The interference signal-to-noise ratio of full-duplex communication system based on theory of wavelength division multiplexing is much smaller than that of the common scatter transmission model. The full duplex UV communication can be realized by WDM technology. The results show that the theory of WDM technology can realize omnidirectional full-duplex UV communication. When the transmission power is increased and the detection efficiency is improved, the application requirements can be fully satisfied. The paper theoretically gives the ultraviolet transmission characteristics of the transmission model without common scatterers, and provides theoretical basis and favorable reference value for the study of omnidirectional communication of actual ultraviolet light.
Abstract: This paper uses multiple scattering model based on Monte Carlo simulation to study the transmission characteristics of uv communication in non common scattering volume And theoretically analyze the performance of the omnidirectional full-duplex UV optical communication system. In the model, the variation of the average scattering times of uv light ...
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Structural and Optical Properties of ZnO Thin Films Deposited by Pyrolysis Spray Method: Effect of Substrate Temperature
Abdelkader Hafdallah,
Fahima Djefaflia,
Narimane Saidane
Issue:
Volume 7, Issue 2, December 2018
Pages:
68-73
Received:
18 June 2018
Accepted:
23 July 2018
Published:
26 September 2018
DOI:
10.11648/j.optics.20180702.12
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Abstract: During the last decades, thin films of ZnO have given rise to a great interest, as transparent conducting oxides. This is due the optical and electrical properties of zinc oxide; it’s very high thermal and chemical stability, its non-toxicity as well as his abandonment in nature. The transparent conducting ZnO thin films were deposited on glass substrate by pyrolysis spray technique. Zinc acetate was used as starting solution with a molarity of 0.1 M. The structural and optical properties of the ZnO thin films were studied as a function of the substrate temperatures in the range of 100 to 400°C. Structural properties have been studied by X-ray diffraction (XRD) technique. The preferred orientation for ZnO thin films lies along (002) direction. From XRD data, the average crystallite size is determined from scherrer formula. The grain size is in the range of 10~27. The transmittance of the films is enhanced from 60 to 85% in the visible region in the range from 400 to 1100 nm by increasing the substrate temperature. The optical band gap energy attenuates from 3.67 to 3.25eV and whereas the Urbach energies of the films increase from 226 to 91.2 meV with increasing the substrate temperature from 100°C to 400°C.
Abstract: During the last decades, thin films of ZnO have given rise to a great interest, as transparent conducting oxides. This is due the optical and electrical properties of zinc oxide; it’s very high thermal and chemical stability, its non-toxicity as well as his abandonment in nature. The transparent conducting ZnO thin films were deposited on glass sub...
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Aberration of Light from a Terrestrial Source
Issue:
Volume 7, Issue 2, December 2018
Pages:
74-79
Received:
26 November 2018
Accepted:
19 December 2018
Published:
10 January 2019
DOI:
10.11648/j.optics.20180702.13
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Abstract: The possibility of observing the aberration of light from terrestrial sources is investigated. The effect of the curvature of the wave fronts of the light flux of a terrestrial source on the observability of its light aberration is analyzed. The influence of the curvature of its wave fronts on the compensation of the light aberration of the ground motionless source relative to the observer source is studied. An analysis of the light aberration of the source in the Jung’s interferometer specifies
Abstract: The possibility of observing the aberration of light from terrestrial sources is investigated. The effect of the curvature of the wave fronts of the light flux of a terrestrial source on the observability of its light aberration is analyzed. The influence of the curvature of its wave fronts on the compensation of the light aberration of the ground ...
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