检索结果-南通市图书馆

Study of OFDM Technique on RoF Passive Optical Network

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Optics and Photonics Journal 2013年第2期3卷 217-224页

作者： Fahad Almasoudi Khaled alatawi Mohammad A. Matin Department Electrical and Computer Engineering University of Denver Denver USA

The combination of radio over fiber (RoF) and orthogonal frequency division multiplexing (OFDM) techniques has resulted in a high-data-rate at lower cost in the last mile of wireless networks. This paper investigates the use of the OFDM as a modulation technique for radio over fiber (RoF) in passive optical network (PON). A laser source of 1550 nm wavelength was used with 100 km, 140 km and 288 km single mode fiber. In the OFDM-PON a passive optical splitter of ratio 1:2 is used to connect two optical network units (ONUs). A 10 Gbits/sec transmission bit rate is used to simulate the RoF-OFDM-PON system. The proposed system can provide a flexible, cost effective and significant high data rate.

关键词： OFDM RoF PON ONU RoF-OFDM ISI ICI QAM

Performance Study of 1 Tbits/s WDM Coherent Optical OFDM System

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Optics and Photonics Journal 2013年第5期3卷 330-335页

作者： Khaled alatawi Fahad Almasoudi Mohammad A. Matin Department of Electrical and Computer Engineering University of Denver Denver USA

This paper investigates the architecture of Tbits/s Wavelength Division Multiplexing (WDM) system by using a Coherent Optical Orthogonal Frequency Division Multiplexing (CO-OFDM) with 4-QAM for long haul transmissions of 1800 Km SM. A simulation of 20 WDM channels spaced at 50 GHz, and 20 OFDM signals each with 50 Gbits/s bitrate to produce data rate of 1 Tbits/s is built. The system performance is studied by observing the constellation diagram of the signal and the relationship of BER and OSNR with regard to transmission distance. The results show that the BER increases as the transmission distance increases. Also, as the transmission distance increases, the OSNR needs to be increased to maintain BER in less than 10-3.

关键词： WDM QAM CO-OFDM BER OSNR

Design of Broadband RoF PON for the Last Mile

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Communications and Network 2012年第4期4卷 269-277页

作者： Ayoob Alateeq Khaled alatawi Fahad Almasoudi Mohammad A. Matin Department Electrical and Computer Engineering University of Denver Denver USA

An increase in the demand of broadband service has encouraged research and study to find a solution to offer an adequate amount of service. Living in this digital world with downloading video, voice or data leads us occasionally to have a shortage of bandwidth in the provided data. One of the solutions to cover the huge expected demand in the future is improving the communication systems by adding optical passive components to the Radio over Fiber (RoF) system. This work is mainly to increase the bandwidth that allows the small and single consumer at the last mile. We have shown that by adding the 40-GHz mm-wave to the system, Bit-Error-Rate (BER) has increased while Q-factor has decreased.

关键词： WDM-PON MM-Wave Radio RoF Q-Factor BER

Investigation of the Surface Brightness Model in the Milky Way via Homotopy Perturbation Method

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Applied Mathematics and Physics 2020年第3期8卷 434-442页

作者： Abdullah A. alatawi Mona Aljoufi Fahad M. Alharbi Abdelhalim Ebaid Department of Mathematics Faculty of Sciences University of Tabuk Tabuk KSA

In this paper, a linear delay model in astronomy, called as Ambartsumian equation, is investigated by two different approaches. The first is the approximate homotopy perturbation method (HPM), while the second is a new closed-form solution for this equation. The results are presented through a table and several plots and have been compared with the relevant literature. It is revealed that the present HPM is of higher accuracy than those approximate techniques used in previously published works, when compared with the obtained analytic solution. The convergence of the new analytic solution has been also discussed.

关键词： Delay Homotopy Perturbation Method Analytic Solution

Solving a Delay Differential Equation by Two Direct Approaches

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Mathematics and System Science 2019年第2期9卷 54-56页

作者： N. O. alatawi A. Ebaid Department of Mathematics Faculty of ScienceUniversity of TabukP.O.Box 741Tabuk 71491Saudi Arabia

The Ambartsumian equation is an application of the theory of surface brightness in the milky way. It is a linear differential equation involving a proportional delay term. In this paper, two different approaches have been used to obtain the power series solution of Ambartsumian equation. The obtained series solution by the suggested approaches agrees with the published solution in the literature. However, the current approaches are not only very simple but also straightforward.

关键词： Ambartsumian equation milky way series solution

Deep-ultraviolet integrated photonic and optoelectronic devices:A prospect of the hybridization of group Ⅲ–nitrides, Ⅲ–oxides,and two-dimensional materials

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Semiconductors 2019年第12期40卷 11-58页

作者： Nasir Alfaraj Jung-Wook Min Chun Hong Kang Abdullah A.alatawi Davide Priante Ram Chandra Subedi Malleswararao Tangi Tien Khee Ng Boon S.Ooi Photonics Laboratory Computer Electrical and Mathematical Sciences and Engineering Division (CEMSE) King Abdullah University of Science and Technology (KAUST)

Progress in the design and fabrication of ultraviolet and deep-ultraviolet groupⅢ–nitride optoelectronic devices,based on aluminum gallium nitride and boron nitride and their alloys,and the heterogeneous integration with two-dimensional and oxide-based materials is *** emphasize wide-bandgap nitride compound semiconductors(i.e.,(B,Al,Ga)N)as the deep-ultraviolet materials of interest,and two-dimensional materials,namely graphene,two-dimensional boron nitride,and two-dimensional transition metal dichalcogenides,along with gallium oxide,as the hybrid integrated *** examine their crystallographic properties and elaborate on the challenges that hinder the realization of efficient and reliable ultraviolet and deep-ultraviolet *** this article we provide an overview of aluminum nitride,sapphire,and gallium oxide as platforms for deep-ultraviolet optoelectronic devices,in which we criticize the status of sapphire as a platform for efficient deep-ultraviolet devices and detail advancements in device growth and fabrication on aluminum nitride and gallium oxide substrates.A critical review of the current status of deep-ultraviolet light emission and detection materials and devices is provided.

关键词： deep-ultraviolet ultraviolet photonics optoelectronics hybrid