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Altagamoa Al Khames, Main centre of town, end of 90th Street
New Cairo
Egypt
Faculty of Engineering & Technology

KAMEL MOHAMED MAHMOUD HASSAN

Basic information

Name : KAMEL MOHAMED MAHMOUD HASSAN
Title: Associate Professor
Personal Info: Kamel HASSAN was born in 1946 (IEEE: M'84', SM' 98' ). He received the B.Sc degree in electrical engineering from the Military Technical College [MTC], Cairo, Egypt in 1967 {Grade: Very Good } ,Diploma degree in communication in 1968 from the same college, then he is granted the M.Sc. degree from Cairo University, Egypt in 1979. He got the Ph.D. degree from Paris XI University-France, 1983. Since 2007 he joined the Faculty of Engineering &Technology-Future University. Since this date he is acting as a head of Electrical engineering Dept. From 1991 to 2006, he was working as an associate professor in Electrical Engineering and Computers Dept, Higher Technological Institute [HTI], 10th of Ramadan city, Egypt. He was heading this department from August 2002 to February.2004.He was appointed as Professor Emirate in HTI from 2006 to 2007. He served as a Student Branch Counselor [HTI] from 1998 to 2007.He served as a jury member of Student Paper Contests, IEEE, Region 8 from 2002 to 2008. Dr. Kamel was appointed as an assistant professor in communication department, Military Technical College, Cairo Egypt, from 1984:1990.He was working as a staff member in Military Technical Institute [MTI] from 1969:1980.He has over 30 published research papers in periodicals, scientific bulletins and proceedings. His interests include optical transmission technology and digital communication. View More...

Education

Certificate Major University Year
PhD Treatements de signaux Paris-Sud University 1983
Masters Electronics & Communications Cairo - Egypt 1979
Diploma Communication Military Technical College 1968
Bachelor Electrical Engineering,Communications Branch Military Technical College 1967

Researches /Publications

Generation of High Quality Microwave Signal Using Different Optoelectronic Techniques - 01/1

KAMEL MOHAMED MAHMOUD HASSAN

Abdelrahman Afifi, M. Abouelatta-Ebrahim

01/11/2019

Generation of a high quality microwave signal based on optical electronic components using oscillation or using filtration have been investigated and implemented experimentally. The experimental results of signal generation using optoelectronic oscillator (OEO) are taken for three different long delay optical fiber lengths. The generated signal has a narrow bandwidth (less than 200 Hz) at carrier frequency of 2.31 GHz with phase noise less than −80 dBc/Hz at 1 kHz offset. Second proposed scheme to improve the quality of an RF signal is presented (optoelectronic Brillouin filter). The 6 dB linewidth of the filter output is reduced to sub hertz and the low frequency noise below 1 kHz is reduced about 10 dB. The scheme consists of a Brillouin-semiconductor optical amplifier (SOA), ring laser fitted with an RF intensity modulator and an APD detector. The optical loop acts as a cavity filter to the RF signal. A jitter in the cavity resonances due to temperature variations is completely eliminated from the output beat signal. There is a 10 dB increase in the phase noise at the FSR frequency and its harmonics. The setup is tested with signals generated by two different microwave sources and at frequencies up to 10 GHz, the limit of the used APD. Sources with RF linewidth less than the optical FSR produces one output mode with sub-hertz line width. For larger line width signals more than one RF frequency is produced, separated by the FSR, each showing the Brillouin linewidth proposed models for both systems are given.

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A comprehensive simulation study of hybrid halide perovskite solar cell with copper oxide as HTM - 01/1

KAMEL MOHAMED MAHMOUD HASSAN

Mohamed Abouelatta, Ahmed Shaker

01/10/2019

Perovskite solar cells (PSCs) have attracted considerable attention as a competitor technology in solar cells due to the rapid enhancement in their power conversion efficiency (PCE) in recent years. PSCs have several advantages such as their bandgap tunability, lower cost, tolerance of high impurities, protracted diffusion length and wide optical absorption. In this paper, simulation of PSCs with copper oxide as a hole transport material (HTM) and different electron transport materials (ETMs) has been presented. The proposed materials are a replacement to the ordinary hole and ETMs; such as the titanium dioxide and the expensive spiro-OMeTAD. In addition, a comprehensive study for optimizing the features and parameters of the PSCs, such as the thickness and defect density of the perovskite layer, the doping concentrations, and the bandgap energy, has been introduced. The simulation and the performance evaluation of the designed PSCs have been carried out using SCAPS-1D. The results show that mixed halide PSC with zinc oxysulfide as ETM and copper oxide as HTM has an enhanced performance with a PCE of up to 30.82%.

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A Comparative Study of different ETMs in perovskite solar cell with inorganic copper as HTM - 01/0

KAMEL MOHAMED MAHMOUD HASSAN

Mostafa M. Sala, Mohamed Abouelatta ; AhmedShaker.

01/02/2019

Perovskite solar cells (PSCs) research is substantially increasing because of the fast improvement in their power conversion efficiency (PCE), cheapness, possibility to tune the bandgap, low recombination rate, high open circuit voltage, excellent ambipolar charge carrier transport and strong and broad optical absorption. In this paper, different electron transport materials (ETMs) have been analyzed with a new Copper Iodide (CuI) Hole Transport Material (HTM) to replace the conventional hole and electron transport materials for PSCs, such as TiO2 and Spiro-OMeTAD which have been known to be susceptible to light induced degradation. Moreover, the influence of the ETL, HTL and the perovskite layer thicknesses on the overall cell performance, is studied. The design of the proposed PSC is performed utilizing SCAPS-1D simulator (Solar Cell Capacitance Simulator-one dimension). Because of its high electron affinity and tunable bandgap, ZnOS is found to be the best replacement for TiO2. The results show that lead-based PSC with CuI as HTM is an efficient arrangement and better than the easily degradable and expensive Spiro-OMeTAD. According to the presented simulation and optimization of various layers thicknesses, the highest designed efficiency is 26.11%.

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Simulation of time-spreading wavelength-hopping OCDMA systems - 01/0

KAMEL MOHAMED MAHMOUD HASSAN

Bazan, Taher M. Hemdan, M.S.

01/02/2019

This paper analyzes the performance of the traditional and balanced time-spreading wavelengthhopping (TW) optical code division multiple access (OCDMA) receivers associated with their appropriate codes. Several 2-D TW codes with different properties are simulated in this work. The experimental simulations are implemented by Optisystem software to demonstrate the performance of a three-user OCDMA system operating at 10 Gb/s. The simulation results reveal that the traditional receiver employing zero cross-correlation (ZCC) codes has better performance if compared to the balanced scheme. In addition, for ZCC codes, the assigned wavelengths to each user highly affect the system performance.

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Undetectable Tapping Methods for Gigabit Passive Optical Network (GPON) - 01/1

KAMEL MOHAMED MAHMOUD HASSAN

shalaby, M. Mokhtar, Ayman. M. Mohamed, A. A. Diaa, M.

01/12/2018

For a certain specified Gigabit passive optical network (GPON), the recommended splitting ratio (SR), used by an eavesdropper, which guarantees the ability to intercept optical signal without being suspected by the end users has been found. As well as the minimum bending radius (BR) which achieves the safe interception has been given also. We showed that (SR) and (BR)

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Generation of High Stability Microwave Signal using Optoelectronic Oscillator based on Long Fiber Delay Line - 01/0

KAMEL MOHAMED MAHMOUD HASSAN

Mohamed, Afifi, Abdelrahman, Abouelatta-Ebrahim, M

01/07/2018

An optoelectronic oscillator based on long fibre delay line to generate high stable microwave signal has been investigated and implemented experimentally. Mathematical model for this oscillator has been proposed. The experimental results are taken for different delay line lengths (2.1 Km, 4.2 Km and 6.6 Km respectively). The generated signal has a narrow bandwidth (less than 200 Hz) at carrier frequency 2.31 GHz and its phase noise is less than -80 dBc/Hz at 1 KHz offset. Comparison of the experimental results and analytical ones has been done. A critical length (Lc) concept of the used fibre delay line has been introduced as a design parameter for the proposed optoelectronic oscillator.

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Tunable Brillouin Opto-Electronic Oscillator based on double fiber loop mirror - 01/0

KAMEL MOHAMED MAHMOUD HASSAN

Abouelatta, Mohamed. Afifi, Abdelrahman E.

01/05/2018

Brillouin beam generation from a tuned pump laser source with large spectral width using double fiber loop mirror is proposed. Synthesize of a microwave signal using this simple technique is presented. This technique has been verified experimentally using a tunable laser source. The results show the generation of Brillouin beam using pump laser of output Power 15mW, and fiber loop mirror length 6.6 Km. Then the generated Brillouin beam is injected to the second loop to make a tunable Brillouin opto-electronic oscillator. The second loop consists of signal laser source, electro-optic modulator, 2 Km single mode fiber, optical detector and microwave amplifier (the microwave amplifier is introduced to achieve the required gain to start oscillation, as a result of the low allowed input power to thedetector used, which is 1 mw in this case). The output oscillation frequency is determined by the difference between the signal frequencies of the generated Brillouin beam and the signal laser source in the second loop.

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The Effect of FWM and SRS on the Performance of WDM Systems with Optical Amplifiers - 01/0

KAMEL MOHAMED MAHMOUD HASSAN

Bazan, Taher M. Shafie, Amr H.

01/03/2018

The performance analysis of wavelength division multiplexing (WDM) systems under the influence of nonlinear fiber effects is evaluated. A mathematical model of WDM system with optical amplifiers is derived taking into consideration the combined effect of four-wave mixing (FWM) and stimulated Raman scattering (SRS) with the amplified spontaneous emission (ASE) noise. The impact of transmitted power, frequency separation and fiber type is also investigated. In addition, the channel allocation technique to enhance the system performance is examined. The results show the detrimental effect of the FWM in conjunction with SRS at high power levels. In addition, the analysis reveals that the wavelength separation achieving the best performance in the presence of SRS and FWM is found to be 0.3 nm.

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High Quality tunable Brillouin optoelectronic oscillator - 01/0

KAMEL MOHAMED MAHMOUD HASSAN

Mahmoud H. Ahmed, Mohamed Abouelatta, and Abdelrahman E. Afifi

01/09/2016

An optical scheme to improve the quality of an RF signal is proposed. The 6 dB linewidth is reduced to sub hertz and the low frequency noise below 1 KHz is reduced about 10 dB. The scheme utilizes a Brillouin-semiconductor optical amplifier (SOA) ring laser fitted with an RF intensity modulator and an APD detector. The experimental results show cavity modes with FSR of 30.57 KHz due to Brillouin fiber length of 6.6 km and 6 dB bandwidth of 780 mHz typical of Brillouin lasers. The gain of the SOA balances out most of the losses in the ring mainly that due to the RF modulator. The modulated optical signal beats at the APD. The optical loop acts as a cavity filter to the RF signal. A jitter in the cavity resonances due to temperature variations is completely eliminated from the output beat signal. There is a 10 dB increase in the phase noise at the FSR frequency and its harmonics. The setup is tested with signals generated by different sources and to frequencies up to 10 GHz, the limit of the APD. Sources with RF linewidth less than the optical FSR produces one output mode with sub-hertz line width. For larger line width signals more than one RF frequency is produced, separated by the FSR, each showing the Brillouin linewidth.

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One Chip Coherent Fiber Optic CDMA Receiver - 01/0

KAMEL MOHAMED MAHMOUD HASSAN

Ahmed H. Elghandour

01/09/2007

A new structure of a fiber optic CDMA receiver is presented. This structure is based on using a passive correlator and active multiplication process with one chip generated locally at last chip position of the received bit duration; we call it "one chip coherent receiver". The performance analysis of this structure showed its superiority over the conventional active and passive correlator receiver structures. Our proposal to use a single optical hard limiter (OHL) after the correlator achieved a considerable improvement of the receiver performance compared to the conventional receiver structure which uses a single OHL in the front of the correlator.

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Performance Comparison of Different OCDMA Encoding and Decoding Techniques - 01/0

KAMEL MOHAMED MAHMOUD HASSAN

Ahmed Hisham Morshed; M. A. Morsy.

01/01/2006

Optical code-division multiple access (OCDMA) is a promising network access technique that can accommodate ultra high transmission capacity and all optical processing to avoid the speed bottleneck of electronics. As one of the most important core technologies in the development of OCDMA local area networks is the optical encoder-decoder technology, different schemes using time domain or frequency domain encoding approaches have been proposed. This paper compares the performance of different encodingdecoding techniques used in OCDMA systems. Three basic implementations of the encoding scheme of an OCDMA local area network are investigated and their bit-error-rate (BER) performance calculated using a photoncounting statistical model: time domain encoding using optical delay lines, spectral intensity encoding, and optical fast frequency hopping (FFHCDMA). A comparison of these three techniques is carried out based on their performance in OCDMA networks of the same bit rate and number of active users. It is found that the spectral intensity encodingdecoding technique has a better BER performance than the time domain and FFH-CDMA techniques. This is because the multiple access interference (MAI) in this technique is very low compared to the other considered techniques.

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Optical Communications - 01/0

KAMEL MOHAMED MAHMOUD HASSAN

01/01/2006

Dispresion Effect On The Performance Of FO-CDMA Passive Correlator Receiver

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Secure Communications - 01/0

KAMEL MOHAMED MAHMOUD HASSAN

01/01/2006

Design of Piplined ASE Encryption Algorithm Using FPGA

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Optical Communications - 01/0

KAMEL MOHAMED MAHMOUD HASSAN

01/01/2006

"Performance Comparison of Different OCDMA Encoding and Decoding Techniques

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Optical Communications - 01/0

KAMEL MOHAMED MAHMOUD HASSAN

01/01/2006

Analysis of optical code division multiple access passive networks for different encoder delay elements

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