BER performance of OCDMA system based on optimised 2D PhC passive encoder

Morsy, Morsy Ahmed; Alsayyari, Abdulaziz

doi:10.1049/iet-com.2019.0567

Cited by 6 publications

(6 citation statements)

References 29 publications

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“…Fig. 2 2D-PhC structure has a square lattice for simplicity and consists of nanorod ITO in an air background [83]. This ITO is followed by a p-Al(0.85)GaAs window confinement layer.…”

Section: Methodology and Analysismentioning

confidence: 99%

Efficiency Enhancement of GaAs Nano Solar Cell Based on 2D Photonic Crystal Trapping Layer and 2D Index Modulation Layer

Morsy

Saleh

2022

IEEE Access

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In this paper, a nano solar cell structure based on a two-dimensional photonic crystal (2D-PhC) antireflection coating (ARC) trapping layer and a 2D-graded-index (2D-GI) GaAs active layer is presented. These components improve the solar absorption, in-coupling efficiency, quantum efficiency, and optical properties of the active layer. The proposed cell absorption and conversion efficiency were analyzed as a function of the cell layer thickness in comparison with the Lambertian absorption and cell efficiency limits. Additionally, each layer thickness was optimized to enhance the overall solar efficiency. All simulations were conducted in the 300 to 1100 nm range using finite difference time domain (FDTD) analysis, where the 2D-PhC structure was represented by indium tin oxide (ITO) nanorods in an air background. In addition, p-Al(0.85)GaAs/n-Al(0.35)GaAs two-window confinement layers are utilized in contact with the 907-nm GaAs active layer as a perfect match with the 1840-nm ITO-ARC layer to improve the confinement efficiency. Moreover, p-Al(0.85)GaAs/GaAs and GaAs/n-Al(0.35)GaAs 2D-GI active layer structures are used for index modulation to enhance the active layer properties and increase the cell short-circuit current. The main objective of this study is to determine the optimum design of a solar cell that can provide the highest power conversion efficiency using inexpensive semiconductor materials. One of the expected results from this research is the design of a 100-µm 2 nano solar cell with 39.2% conversion efficiency, a short circuit current density of 44.38 mA/cm 2 , and an open-circuit voltage of 1 V. INDEX TERMSTwo-dimensional photonic crystal (2D-PhC), light trapping, 2D-index modulation, absorption, conversion efficiency, short circuit current, open circuit voltage.

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“…Fig. 2 2D-PhC structure has a square lattice for simplicity and consists of nanorod ITO in an air background [83]. This ITO is followed by a p-Al(0.85)GaAs window confinement layer.…”

Section: Methodology and Analysismentioning

confidence: 99%

Efficiency Enhancement of GaAs Nano Solar Cell Based on 2D Photonic Crystal Trapping Layer and 2D Index Modulation Layer

Morsy

Saleh

2022

IEEE Access

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“…The user power of the OFDM signal after the photo-detector can be expressed as 8 – 10 Puser=R[SL](W−1)∑n=1NCnej2πfnt,where R is the photo-detector responsivity, S is the optical power received, fn is the subcarrier frequency of user number n, n∈{1,2,3,…,N}, and Cn is the complex bit when n=N. In addition, the subcarrier frequency and the photo-detector responsivity can be defined as fn=n−1N,R=ηehv,where η…”

Section: Proposed System Architecture and Modelingmentioning

confidence: 99%

“…Among the variety of 6G visions is ultrafast speed communication, which aims to increase the data rate from 100 to 1000 times faster than the rate typically provided by 5G. This can be achieved using a multi-band high-spread spectrum to produce data rates from hundred Gbps to several Tbps using optical integrated encoder/decoder 8 . Additionally, from the capacity point of view, the 6G network must be able to accommodate larger than trillion level objects instead of the currently billion level objects of 5G.…”

Section: Introductionmentioning

confidence: 99%

“…This can be achieved using a multi-band high-spread spectrum to produce data rates from hundred Gbps to several Tbps using optical integrated encoder/decoder. 8 Additionally, from the capacity point of view, the 6G network must be able to accommodate larger than trillion level objects instead of the currently billion level objects of 5G. Throughout the literature, some potential techniques have been suggested to meet the requirements of the 6G networks, for example: Common challenges that prevent the optimal utilization of 6G are specified in the following along with their suggested solutions.…”

Section: Introductionmentioning

confidence: 99%

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Multi-users different rates visible light communication system for sixth-generation multimedia applications

Alsayyari

2023

Opt. Eng.

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.The two most significant issues that communication engineers have been confronting since the development of fifth-generation wireless networks are bandwidth increase and energy-saving techniques in data transmission. We present an innovative solution for utilizing a multi-user different-rates visible light communication (VLC) system for sixth-generation applications. Such a solution takes advantage of orthogonal frequency division multiple access (OFDMA) with orthogonal codes as multiple access communication networks. For the achievement of energy-saving and wide beam width of the optical source, the light emitting diode is often used as a transmitter. Furthermore, one of the most popular orthogonal codes in use is the double length modified prime code, which has been utilized for enhancing communication network security and network capacity. Most importantly, the performance of the network is evaluated versus the number of users, taking into consideration the amount of noise resulting from the multiple access interference, shot noise, and thermal noise. The error vector magnitude has also been considered for performance analysis and results. Significantly, the obtained results show the possibility of accommodating 110 users at an error rate of no more than 10 − 9 and a data rate per user of 50 Gbps.

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“…The obtained results proved that the cross-correlation property of this code is limited to one and the auto-correlation property is higher than that of other MPC families. In [47], the design of 2D photonic crystal OCDMA encoder based on the WMPC was developed and presented.…”

Section: Literature Reviewmentioning

confidence: 99%

A New Hybrid Prime Code for OCDMA Network Multimedia Applications

Morsy

Aly

2021

Electronics

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This paper presents a new family of spreading code sequences called hybrid prime code (HPC), to be used as source code for the optical code division multiple access (OCDMA) network for large network capacity. The network capacity directly depends on the number of available code sequences provided and their correlation properties. Therefore, the proposed HPC is designed based on combining two or more different code words belonging to two or more different prime numbers. This increases the number of code sequences generated. The code construction method utilized allows the generation of different code sets, each with different code length and weight, according to the number of prime numbers used. In addition, the incoherent pulse position modulation (PPM) OCDMA system is proposed based on the HPC code. Furthermore, the bit error rate (BER) performance analysis is introduced versus the received optical power and the number of active users. Moreover, the error vector magnitude (EVM) is calculated versus the optical signal-to-noise ratio. This work proves that using two prime numbers simultaneously generates far more codes than using prime numbers separately. It also achieved an OCDMA system capacity higher than the system that uses the optical orthogonal codes (OOCs), modified prime codes (MPCs) families, and two code families with separate simultaneously prime numbers, at a BER below 10−9 which is the optimum level.

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BER performance of OCDMA system based on optimised 2D PhC passive encoder

Cited by 6 publications

References 29 publications

Efficiency Enhancement of GaAs Nano Solar Cell Based on 2D Photonic Crystal Trapping Layer and 2D Index Modulation Layer

Efficiency Enhancement of GaAs Nano Solar Cell Based on 2D Photonic Crystal Trapping Layer and 2D Index Modulation Layer

Multi-users different rates visible light communication system for sixth-generation multimedia applications

A New Hybrid Prime Code for OCDMA Network Multimedia Applications

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