Salam Al Zaidi

Aim of project:

To study the characteristic of Vertical Cavity Surface Emitting Lasers by optical feedback and optical injection and to improve the performance of VCSEL devices for optical communication applications.

Specific objectives: Investigating optical properties of VCSELs such as
polarization switching; dynamical instabilities; relative intensity noise;
chaotic dynamics and other behaviours by optical feed.

Motivations: There is a need to increase the security protection of data being transmitted in order to prevent hacking of information and systems intrusions. VCSELs exhibit unpredictable chaotic and dynamic properties especially when it is subject to an external optical feedback, thus making them a promising candidate for transmission sources in chaotic optical communication systems. Therefore, these reasons give justified to undertake VCSELs properties in-depth investigation to fulfil basic performance requirements for wireless communication system.

Research Supervisors

• Fary Z. Ghassemlooy (principal)
• Krishna  Busawon

Key Publications

1           Salam Nazhan Ahmed , Z. Ghassemlooy , Krishna Busawon and  Perez, J. “Hysteresis properties induced by variable polarization angle in the polarization switching of VCSELs,” 9th International Symposium on Communication Systems, Networks & Digital Signal Processing (CSNDSP), 2014, Manchester, UK, pp. 325 - 329

2           Salam Nazhan Ahmed , Z. Ghassemlooy , Krishna Busawon and Stanislav Zvanovec “ Relative Intensity Noise of Vertical-Cavity Surface-Emitting Lasers Subject to Variable Polarization-Optical Feedback”  IWOW 2014, 17-19 September - 7th Opticwise MC/WG Meeting & 3rd International Workshop on Optical Wireless - Funchal, Madeira Island, Portugal.

3           Salam Nazhan Ahmed, Z. Ghassemlooy and  Krishna Busawon. “Investigation of current modulation effects on threshold current of an 850nm single-mode VCSEL,” Proceeding of the Northumbria Research Conference, Newcastle, UK, 21-22 May 2014.

4           Salam Nazhan Ahmed, Z. Ghassemlooy, K. Busawon and A.Gholami “Variable-Polarization Optical Feedback Induced High-Quality Polarization-Resolved Chaos Synchronization in VCSEL” Science and Information Conference 2015, July 28-30, London, UK (paper in process)

5           Salam Nazhan Ahmed, Josep pericas, Zabih Ghassemlooy and Krishna Busawon “Chaotic regime modulation in VCSEL based on Rotated Polarisation-Preserved Optical Feedback” photonics global conference 2015, (PGC), 28 June to 03 July, Singapore. (Paper in process)

6           Salam Nazhan Ahmed, Z. Ghassemlooy and  Krishna Busawon “High-quality Chaos Synchronization in VCSEL polarization modes under  Optical Feedback” Proceeding of the Northumbria Research Conference, Newcastle, UK, 21-22 May 2015 (poster)