Optics and Photonics Journal

Journal Information
ISSN / EISSN : 21608881 / 2160889X
Current Publisher: Scientific Research Publishing, Inc. (10.4236)
Total articles ≅ 499
Archived in
SHERPA/ROMEO
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Latest articles in this journal

Raoule J. O. Agoua, Aladji Kamagaté, Adama Konaté, Mourad Menif, Olivier Asseu
Optics and Photonics Journal, Volume 10, pp 29-40; doi:10.4236/opj.2020.103003

Abstract:
Larger wireless access networks are required to meet the growing demand for mobile traffic and multimedia services. The use of RoF (Radio over Fiber) technology in combination with millimeter waves is a potential response to the requirements of broadband applications and high capacity networks. In this paper, we proposed a RoF architecture able to provide very high-speed wireless access points up to Gbps considering an indoor and outdoor environment conform to IEEE 802.11ad and IEEE 802.15.3c standard. Optical transmission and radio coverage have been studied by considering the uplink and downlink. System performance has been evaluated in the relation to the Error Vector Magnitude (EVM) for various modulation formats (BPSK, QPSK and 16QAM). Results showed that millimeter wave signals are successfully delivered over a 50 km fiber link and a wireless channel up to 32 m. Data throughput up to 5.28 Gbps has been reached. The proposed architecture can extend the range of applications for wireless communications in association with the unlicensed 60 GHz band with the advantages of better capacity, a wider coverage area and a reduction in the investment cost.
Wei-Xing Xu
Optics and Photonics Journal, Volume 10, pp 41-48; doi:10.4236/opj.2020.104004

Abstract:
In this work, the spacetime distributions of the electric and magnetic fields of photon are revealed. It is first time found that the spacetime distributions of electric and magnetic fields of photon are source dependent. Based on this discovery, some potential applications are discussed.
Xizheng Ke, Xiaozhan Chen, Ke Xizheng, Chen Xiaozhan
Optics and Photonics Journal, Volume 10, pp 64-77; doi:10.4236/opj.2020.104006

Abstract:
In order to improve the correction effect of the adaptive optical system in coherent optical communication, we investigate the relative distortion between the wavefronts of different wavelengths of the beams transmitted on the near-ground horizontal atmospheric turbulent links emitted by coherent optical communication system. And the situation is analyzed when the wavelength corresponding to the wavefront detected by the wavefront detector and the wavelength corrected by the deformed mirror are different, the influence of the wavelength factor on the adaptive optical system correction. We use a series of trigonometric functions and the Hankel transformation to derive the corrected residual variance and the Strehl ratio between the wavefront distortions of the wavelengths of the dual-wavelength combined beam in atmospheric turbulence. In relation to the parameters of the turbulent environment, the ensemble average of the wavefront difference corresponding to different wavelengths the derived is proposed as the coefficient to correct the dual-wavelength adaptive optical system. The results show that the statistic of the turbulence internal scale has a major influence on the difference between the wavefronts. By adding the correction coefficient, the signal light’s wavefront of the coherent optical communication system can be corrected more effectively by the dual-wavelength adaptive optical closure.
Keliang Hou, Chunwei Wang, Xiang Liu
Optics and Photonics Journal, Volume 10, pp 79-87; doi:10.4236/opj.2020.105007

Abstract:
In production and scientific research, the research on the characteristics of submicron particles has attracted extensive attention, which is of great significance to the development of industrial production, medical and health inspection and other fields. In this paper, the characteristics of submicron particles are studied based on backlight scattering. By collecting the real-time waveform of the backscattering signal of particles with different particle sizes at different concentrations, the corresponding relationship between the particle concentration and the number of pulses was obtained. It is found that the peak value of the backscattered light energy has a good linear relationship with the particle size. The analysis of the signal distribution law of standard particle swarm with different particle size parameters found that it conformed to the lognormal distribution form.
Andrey L. Sokolov
Optics and Photonics Journal, Volume 10, pp 13-27; doi:10.4236/opj.2020.102002

Shaban Mustafa Samia, Samia Shaban Mustafa
Optics and Photonics Journal, Volume 10, pp 1-12; doi:10.4236/opj.2020.101001

Abstract:
The variation of the temperature of the solar cell subjected to the incident global solar radiation along the local daytime in relation to its efficiency is studied. The heat balance equation is solved. The solution revealed that the cell temperature is a function of the maximum value of the daily incident global solar radiation qmax, the convection heat transfer coefficient (h), the optical, physical and the geometrical parameters of the cell. The temperature dependence of the short circuit current Isc, the dark saturation current Io, the open circuit voltage Voc, and the energy band gap Eg characterizing a Silicon solar cell is considered in evaluating the cell efficiency. Computations of the efficiency concerning operating conditions and astronomical locations (Egypt) as illustrative examples are given.
Xizheng Ke, Shasha Wang
Optics and Photonics Journal, Volume 10, pp 49-63; doi:10.4236/opj.2020.104005

Abstract:
For the traditional photonic crystal fibers with circular air holes, rectangular air holes are added to the fiber cladding. The periodic arrangement of the inner rectangular air holes allows the fiber structure to better match the annular mode field distribution of the vortex beam. The fiber structure was analyzed and calculated by COMSOL Multiphysics 5.4 finite element software, and the characteristics of fiber were analyzed, such as the dispersion, confinement loss, effective mode area and nonlinear coefficient. The results reveal that the photonic crystal fiber structure capable of carrying 50 orbital angular momentum (OAM) modes at the wavelength of 1.15 to 2.0 μm (850 nm). The effective refractive index difference Δneff between vector modes can reach 1 × 10-3, and larger difference can effectively separate the vector modes and improve the transmission performance of OAM modes. Moreover, the fiber has good performance, such as flat dispersion distribution of the low-order modes, low confinement loss below 10-9 dB·m-1, large effective mode field area and small nonlinear coefficient in the 850 nm wavelength range. Therefore, this fiber structure can be applied to the high-capacity communication system of fiber multiplexing OAM. In addition, the good characteristics of this fiber structure are of great significance for the transmission of vortex beam in fiber.
Miao Dong, Yuanjie Yang
Optics and Photonics Journal, Volume 10, pp 159-166; doi:10.4236/opj.2020.106017

The publisher has not yet granted permission to display this abstract.
Xiaodong Yang, Ming Gao
Optics and Photonics Journal, Volume 10, pp 95-104; doi:10.4236/opj.2020.106009

The publisher has not yet granted permission to display this abstract.
Yong Zhou, Junqiang Sun
Optics and Photonics Journal, Volume 10, pp 117-124; doi:10.4236/opj.2020.106012

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