Future University In Egypt (FUE)
Future University is one of most promising private universities in Egypt. Through excellence in teaching, research and service, Future University strives to provide a comprehensive, high-quality education that prepares our graduates to be future leaders.
mainLogo
90th Street
New Cairo
Egypt
Faculty of Engineering & Technology
Apply Now

MOHAMED MOUSA SAYED EMAM AHMED

Basic information

Name : MOHAMED MOUSA SAYED EMAM AHMED
Title: Assistant Lecturer
Personal Info: Eng. Mohamed Moussa joined Faculty of Engineering and Technology since September 2006. He has been graduated from Electronics and Communications Engineering Dept., Faculty of Engineering and Technology – Future University in Egypt. He achieved an excellent score {CGPA = 4. 0}. September 2011, Eng. Mohamed Moussa joined the EED as a Teaching Assistant. January 2012, Eng. Mohamed Moussa joined Electronics and Communications Engineering Dept., Faculty of Engineering, Ain- Shams University to follow up his postgraduate studies. He achieved excellent results where he terminated successfully 10 courses with CGPA equals to 3.90. View More...

Education

Certificate Major University Year
Masters Electerical Department Ain Shams Univeristy - Faculty of Engineering 2017
Bachelor Electerical Department Future University - Faculty of Engineering 2011

Researches /Publications

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

MOHAMED MOUSA SAYED EMAM AHMED

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.

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

MOHAMED MOUSA SAYED EMAM AHMED

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.

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

MOHAMED MOUSA SAYED EMAM AHMED

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.

Download PDF
High Quality tunable Brillouin optoelectronic oscillator - 01/0

MOHAMED MOUSA SAYED EMAM AHMED

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.

Download PDF

Follow us on

Visit the Faculty

ADS