Salwa Ahmed Fouad Ahmed El-Sabban

Verified @h-eng.helwan.edu.eg

Electronics and Communication Engineering Department/ Faculty of Engineering - Helwan University

Salwa Ahmed Fouad Ahmed El-Sabban


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https://researchid.co/selsabban
Salwa El-Sabban obtained her B.Sc., and M.Sc. from the Faculty of Eng., Ain Shams University. From 1987 to 1996, she worked in the software development and marketing at Kolaly Engineering. She received her Ph.D. degree in Integrated Optics, from the INPG (Institut National Polytechnique de Grenoble) France in 2001. She is an Associate Professor at the Dept. of Electronics, Communication Eng. in the Faculty of Eng., Helwan University since 2019. Her current interests include Integrated Optics, , and Optical Communication Systems. Dr. Salwa El-Sabban is a senior member in IEEE, and a member in OSA and SPIE. She is an author and co-author of one textbook and several international publications.

EDUCATION

Ph.D. degree in Integrated Optics, from the INPG (Institut National Polytechnique de Grenoble) France

RESEARCH, TEACHING, or OTHER INTERESTS

Electrical and Electronic Engineering, Computer Networks and Communications
22

Scopus Publications

123

Scholar Citations

6

Scholar h-index

5

Scholar i10-index

Scopus Publications

  • 3-Waveguide Mode Filter in Multilevel Si Photonics
    Salwa El-Sabban, Diaa Khalil
    Fiber and Integrated Optics, 2026
    In this study, we present the design and analysis of a mode filter based on the use of a 3-waveguide coupler. The coupler is assumed to have a multimode central guide surrounded by two similar single mode waveguides. A theoretical model is developed based on the coupled mode theory and using the coherent tunneling adiabatic passage approach. The model shows that the coupler can be characterized by an effective coupling length that accounts for the coupling of each of the outer guides with the central guide. The estimated coupling length is in good agreement with the numerically calculated one using the Semivectorial Beam Propagation Method SV-BPM. The filter function is also well explained by the supermode interference in the structure. Based on this model, the design of a 3-waveguide mode filter built on SiN multilevel technology is introduced. An optimized design of the filter showing a crosstalk better than −40 dB at a wavelength of 1550 nm is demonstrated. This opens the door for new 3D integrated optical circuits in which the transition from single-mode to multi-mode in the vertical direction can be handled.
  • Multilevel asymmetric coupler MAC polarization beam splitter for Si photonics technology
    Salwa El-Sabban, Diaa Khalil
    Results in Optics, 2024
    In this work, we present a new design of an integrated optical polarization beam splitter using the Multilevel Asymmetric Coupler MAC structure. The proposed structure is using CMOS compatible Si/SiO2 technology. The structure is tested using the Finite Difference Time Domain FDTD technique and showed a very good performance. The compromise between the structure footprint on Si and its performance is also investigated. The structure can offer an Extinction Ratio ER greater than 40 dB with a length of 5 µm. It can also be designed with a smaller length of only 2 µm but in this case its ER will be only 20 dB. It has a bandwidth of about 60 nm in which the insertion loss is less than 0.003 dB for the TE wave and less than 0.2 dB for the TM wave.
  • Optical coupling into deeply etched Si waveguide
    Salwa El-Sabban, Diaa A. M. Khalil
    Proceedings of SPIE the International Society for Optical Engineering, 2024
    Currently, grating couplers are widely used for the coupling from Single Mode Fiber SMF to Silicon Photonic waveguides. They have relatively good efficiency and they also allow surface testing of the components which is very important for the rapid testing and yield estimation of Si-Photonics circuits and their industrial wide spread. Recently, there has been an interest in Silicon waveguides with large cross section to reduce the maximum intensity in the guide and hence reduce the non-linear effects especially the two-photon absorption in Silicon ring resonators. Increasing the waveguide depth allows also lower diffraction for the output optical beam in chip-to-chip interconnection when using external mirror for beam routing and in optical sensing applications. When using the grating coupler with such deeply etched waveguides, higher order modes are usually generated in the guide and these modes are sometimes not desirable in the optical circuit to guarantee a specific optical performance. In this work, we present a design of an optical circuit for coupling power from Single Mode Fiber to the fundamental mode of a deeply etched Si waveguide with a depth of 500 nm at 1310 nm wavelength. The silicon guide is covered by silicon dioxide layer. The excitation is achieved through a grating structure designed for this purpose. The waveguide is multimode in the vertical direction and the higher order modes in this direction are filtered using a mode filter. The mode filter is based on the structure of a symmetric 3-waveguides directional coupler in which the 2 outer guides are designed to match the propagation constant of the higher order mode to be filtered. The proposed structure (grating and mode filter) achieves a coupling efficiency of about 37% for the fundamental mode of the deeply etched guide and a higher order mode rejection ratio greater than 28 dB. The structure performance is analyzed using the Finite Difference Time Domain FDTD technique.
  • Multilevel asymmetric coupler MAC field rotator for LP11 mode in few mode fiber
    Salwa El-Sabban, Diaa Khalil
    Optical and Quantum Electronics, 2023
    In this work, we present a new design for an integrated optical field rotator for the mode LP11a to the mode LP11b and vice versa using planar Silica over silicon technology. The structure is designed using a Multilayer Asymmetric Coupler. The coupling efficiency of the coupler could be as high as 99% when its length is about 1 mm. For a shorter coupler of length 550 microns and a coupling efficiency of 91%, a complete structure is designed to couple 2 few mode fibers of diameters 15.4 microns through an inverted taper from one side and a Y junction with two inverted tapers from the other side. The fiber to fiber insertion loss of the proposed structure is less than 3 dB over about 190 nm spectral range around 1550 nm. The 3 dB bandwidth of the structure is greater than 360 nm as demonstrated by the Beam Propagation Method BPM simulation.
  • 2D coupling configurations in integrated optical structures
    Amr Wageeh, Salwa El-Sabban, Diaa Khalil
    Optik, 2023
  • 2D spot size converter using a multilevel asymmetric coupler MAC structure for Si photonics planar technology
    Salwa El-Sabban, Diaa Khalil
    Journal of the Optical Society of America B Optical Physics, 2023
    In this work, we present an architecture for the design of an integrated optical spot size converter using planar technology. The proposed architecture is based on the use of multilevel planar structures without using vertical tapers. The function of the vertical taper is replaced by a horizontal taper and a multilevel asymmetric coupler structure. The proposed technique, used to couple a single-mode fiber with a core diameter of 8.2 µm to a silica-over-silicon waveguide with a 2 µ m × 4 µ m cross section, has a coupling efficiency greater than 98% without the need for a vertical coupler. The coupling transformation of the spot of the standard 500 n m × 220 n m Si photonics waveguide to the fundamental mode of a 1 µ m × 1 µ m waveguide is also demonstrated with a coupling efficiency greater than 92%. This technique offers very high flexibility in the coupling between different waveguides with different cross sections.
  • Optical phase shifter design for single and multi-mode waveguide configurations
    Amr Wageeh, Salwa El-Sabban, Diaa Khalil
    Optical and Quantum Electronics, 2022
    In this paper, we introduce simple design equations for optical phase shifter configurations on both single mode and multimode platforms. The design equations are based on approximate analytical expressions describing the phase shift (difference) between two waveguides, one is considered as the reference guide and the second is considered as the phase shifter. Different layout geometrical configurations have been studied: the step width and the linear tapering waveguide. The validity of the design formula is tested using standard Beam Propagation Method BPM. The obtained results are in good agreement with numerical calculations and allow using these closed form expressions in the optical design of such phase shifters.
  • Design of a 2D fiber mode converter using a planar 2D multi-mode interference structure
    Amr Wageeh, Salwa El-Sabban, Diaa Khalil
    Optik, 2020
  • Odd excitation of symmetric multimode interference structures
    Salwa El-Sabban, Diaa Khalil
    Applied Optics, 2019
    In this work, we study the odd excitation of symmetric multimode interference (MMI) integrated optical structures. We develop a simple formula for the imaging length in the guide under odd excitation in the MMI structures using the symmetry of the structure. The obtained analytical results are verified by numerical calculations using the beam propagation method. The developed model is applied for both 2D and 3D MMI structures successfully. It also allows building functional devices such as power splitters or mode converters for the odd/asymmetric modes of the waveguide.
  • Crosstalk analysis in asymmetric directional coupler for MDM application
    Amr Wageeh, Salwa El-Sabban, Gamal A. F. M. Khalaf, Diaa Khalil
    Proceedings of SPIE the International Society for Optical Engineering, 2019
    Mode Division Multiplexing and De-multiplexing (MDMux / MDDeMux) has been considered a promising technique for increasing link capacity in optical interconnection. One of the most promising structures currently proposed for this application is the Asymmetric Directional Coupler ADC designed to match the propagation constant of the fundamental mode in one guide to that of the higher order modes of the adjacent guides in the coupler. Such an ADC has been used extensively in the literature to demonstrate the mode Mux for up to 16 modes in planar optical circuits. One of the key parameters in the design of such Mux / DeMux is the crosstalk (CT) due to the leakage of an undesired mode in a specific waveguide / channel. The evaluation of this parameter is usually done using numerical techniques such as the BPM or the FDTD. In this work, we apply the Coupled Mode Theory (CMT) on the ADC for the evaluation of the cross talk between guides. The results of the CMT are compared with those obtained by the 2D Beam Propagation Method, and a very good agreement is obtained. The CT is also calculated as a function of the wavelength and the location of the minimum is determined with accuracy better than 2.5 nm at the wavelength of 1550 nm. The developed CMT formulation allows very rapid structure optimization due to the great reduction in the design cycle.
  • Mode converter using 2D MMI
    Amr Wageeh, Salwa El-Sabban, Diaa Khalil
    Proceedings of SPIE the International Society for Optical Engineering, 2018
  • Compact Si photonic multimode interference-based optical circuit for mode division multiplexing applications
    Salwa El-Sabban, Diaa Khalil
    Optical Engineering, 2016
  • Design and simulation of a vertical broadband seismometer
    E. Habbak, H. Nofal, E. Lotfy, S. El-Sabban, Z. Nossair
    Arabian Journal of Geosciences, 2016
  • Box-like filter response using multimode single-ring microresonators
    Salwa El-Sabban, Amr Wageeh, Diaa Khalil
    Applied Optics, 2016
  • Multimode waveguide spot size width converter for silicon photonics applications
    Salwa El-Sabban, Diaa Khalil
    Optical Engineering, 2015
  • Resonance wavelength of integrated optical ring resonator with small radius of curvature
    Amr Wageeh, Salwa El-Sabban, Diaa Khalil
    IEEE Photonics Technology Letters, 2014
  • Multi-granularity grooming using timing information in optical networks with waveband and TDM switching
    Tabarak allah Ali Mohamed, Salwa El-Sabban, Gamal Abdel Fadeel Mohamed Khalaf
    Ain Shams Engineering Journal, 2014
  • On the resonance frequency of an integrated optical ring resonator with low radius of curvature
    Diaa Khalil, Amr Wageeh, Salwa El-Sabban, G. A. F. M. Khalaf
    Proceedings of SPIE the International Society for Optical Engineering, 2014
  • On the modeling of an external cavity tunable laser ECTL source with finite mirror dimensions
    Progress in Electromagnetics Research Symposium, 2013
  • Fabrication and test of an integrated optical magic T on a glass substrate
    S. El-Sabban, I. Schanen, D. Khalil, P. Benech
    IEEE Photonics Technology Letters, 2001
  • Design of an integrated optical magic T for astronomy applications
    Salwa El-Sabban, Diaa Khalil, Isabelle Schanen, Pierre Benech
    Applied Optics, 2000
  • Design of an integrated optical magic T using the multimode interference phenomena
    Salwa El-Sabban, Diaa A. M. Khalil, Isabelle Schanen-Duport, Pierre Benech, TedJini Smail
    Proceedings of SPIE the International Society for Optical Engineering, 1999

RECENT SCHOLAR PUBLICATIONS

  • Multi-ring resonator shared bus structures for optical communications
    DAM Khalil, SAFA El-Sabban, SA Ibrahim
    US Patent App. 19/259,355 , 2026
    2026
  • 3-Waveguide Mode Filter in Multilevel Si Photonics
    S El-Sabban, D Khalil
    Fiber and Integrated Optics 45 (1), 1-18 , 2026
    2026
  • Double ring resonator shared bus structure
    S EL-SABBAN, S IBRAHIM, D KHALIL
    2024
  • Multilevel asymmetric coupler MAC polarization beam splitter for Si photonics technology
    S El-Sabban, D Khalil
    Results in Optics 15, 100637 , 2024
    2024
    Citations: 2
  • Optical coupling into deeply etched Si waveguide
    S El-Sabban, D Khalil
    Integrated Optics: Devices, Materials, and Technologies XXVIII 12889, 154-163 , 2024
    2024
  • Multilevel asymmetric coupler MAC field rotator for LP 11 mode in few mode fiber
    S El-Sabban, D Khalil
    Optical and Quantum Electronics 55 (12), 1118 , 2023
    2023
    Citations: 3
  • 2D coupling configurations in integrated optical structures
    A Wageeh, S El-Sabban, D Khalil
    Optik 276, 170649 , 2023
    2023
    Citations: 5
  • 2D spot size converter using a multilevel asymmetric coupler MAC structure for Si photonics planar technology
    S El-Sabban, D Khalil
    Journal of the Optical Society of America B 40 (1), 79-86 , 2022
    2022
    Citations: 5
  • Optical phase shifter design for single and multi-mode waveguide configurations
    A Wageeh, S El-Sabban, D Khalil
    Optical and Quantum Electronics 54 (8), 499 , 2022
    2022
    Citations: 6
  • Design of a 2D fiber mode converter using a planar 2D multi-mode interference structure
    A Wageeh, S El-Sabban, D Khalil
    Optik 210, 164500 , 2020
    2020
    Citations: 10
  • Odd excitation of symmetric multimode interference structures
    S El-Sabban, D Khalil
    Applied Optics 58 (14), 3836-3843 , 2019
    2019
    Citations: 1
  • Crosstalk analysis in asymmetric directional coupler for MDM application
    A Wageeh, S El-Sabban, G Khalaf, D Khalil
    Integrated Optics: Devices, Materials, and Technologies XXIII 10921, 261-269 , 2019
    2019
  • Mode converter using 2D MMI
    A Wageeh, S El-Sabban, D Khalil
    Integrated Optics: Devices, Materials, and Technologies XXII 10535, 301-309 , 2018
    2018
    Citations: 5
  • Compact Si photonic multimode interference-based optical circuit for mode division multiplexing applications
    S El-Sabban, D Khalil
    Optical Engineering 55 (7), 076102-076102 , 2016
    2016
    Citations: 11
  • Design and simulation of a vertical broadband seismometer
    SESZN E. Habbak, H. Nofal, E. Lotfy
    Arabian Journal of Geosciences , 2016
    2016
    Citations: 6
  • Box-like filter response using multimode single-ring microresonators
    S El-Sabban, A Wageeh, D Khalil
    Applied Optics 55 (2), 408-414 , 2016
    2016
    Citations: 3
  • Multimode waveguide spot size width converter for silicon photonics applications
    S El-Sabban, D Khalil
    Optical Engineering 54 (3), 037103-037103 , 2015
    2015
    Citations: 6
  • Multi-granularity grooming using timing information in optical networks with waveband and TDM switching
    S El-Sabban, GAFM Khalaf
    Ain Shams Engineering Journal 5 (2), 433-448 , 2014
    2014
    Citations: 1
  • Resonance wavelength of integrated optical ring resonator with small radius of curvature
    A Wageeh, S El-Sabban, D Khalil
    Photonics Technology letters, IEEE , 2014
    2014
    Citations: 10
  • On the resonance frequency of an integrated optical ring resonator with low radius of curvature
    D khalil, A Wageeh, S El-Sabban, GAFM Khalaf
    Photonics West 2014 , 2014
    2014

MOST CITED SCHOLAR PUBLICATIONS

  • Fabrication and test of an integrated optical magic T on a glass substrate
    S El-Sabban, I Schanen, D Khalil, P Benech
    IEEE Photonics Technology Letters 13 (7), 684-686 , 2001
    2001
    Citations: 20
  • Design of an integrated optical magic T for astronomy applications
    S El-Sabban, D Khalil, I Schanen, P Benech
    Applied optics 39 (36), 6781-6786 , 2000
    2000
    Citations: 18
  • Compact Si photonic multimode interference-based optical circuit for mode division multiplexing applications
    S El-Sabban, D Khalil
    Optical Engineering 55 (7), 076102-076102 , 2016
    2016
    Citations: 11
  • Design of a 2D fiber mode converter using a planar 2D multi-mode interference structure
    A Wageeh, S El-Sabban, D Khalil
    Optik 210, 164500 , 2020
    2020
    Citations: 10
  • Resonance wavelength of integrated optical ring resonator with small radius of curvature
    A Wageeh, S El-Sabban, D Khalil
    Photonics Technology letters, IEEE , 2014
    2014
    Citations: 10
  • Design of an integrated optical magic T using the multimode interference phenomena
    S El-Sabban, DAMM Khalil, I Schanen-Duport, P Benech, TJ Smail
    Integrated Optics Devices III 3620, 298-302 , 1999
    1999
    Citations: 7
  • Optical phase shifter design for single and multi-mode waveguide configurations
    A Wageeh, S El-Sabban, D Khalil
    Optical and Quantum Electronics 54 (8), 499 , 2022
    2022
    Citations: 6
  • Design and simulation of a vertical broadband seismometer
    SESZN E. Habbak, H. Nofal, E. Lotfy
    Arabian Journal of Geosciences , 2016
    2016
    Citations: 6
  • Multimode waveguide spot size width converter for silicon photonics applications
    S El-Sabban, D Khalil
    Optical Engineering 54 (3), 037103-037103 , 2015
    2015
    Citations: 6
  • 2D coupling configurations in integrated optical structures
    A Wageeh, S El-Sabban, D Khalil
    Optik 276, 170649 , 2023
    2023
    Citations: 5
  • 2D spot size converter using a multilevel asymmetric coupler MAC structure for Si photonics planar technology
    S El-Sabban, D Khalil
    Journal of the Optical Society of America B 40 (1), 79-86 , 2022
    2022
    Citations: 5
  • Mode converter using 2D MMI
    A Wageeh, S El-Sabban, D Khalil
    Integrated Optics: Devices, Materials, and Technologies XXII 10535, 301-309 , 2018
    2018
    Citations: 5
  • Multilevel asymmetric coupler MAC field rotator for LP 11 mode in few mode fiber
    S El-Sabban, D Khalil
    Optical and Quantum Electronics 55 (12), 1118 , 2023
    2023
    Citations: 3
  • Box-like filter response using multimode single-ring microresonators
    S El-Sabban, A Wageeh, D Khalil
    Applied Optics 55 (2), 408-414 , 2016
    2016
    Citations: 3
  • Multilevel asymmetric coupler MAC polarization beam splitter for Si photonics technology
    S El-Sabban, D Khalil
    Results in Optics 15, 100637 , 2024
    2024
    Citations: 2
  • On the modeling of an external cavity tunable laser ECTL source with finite mirror dimensions
    A Fawzy, S El-Sabban, I Ismail, D Khalil
    PIERS Proceedings, 691-694 , 2013
    2013
    Citations: 2
  • Planar Integrated Optics Beam Combiners for Astronomical Aperture Synthesis
    JP Berger, I Schanen-Duport, S El-Sabban, P Benech, M Severi, ...
    Working on the Fringe: Optical and IR Interferometry from Ground and Space … , 1999
    1999
    Citations: 2
  • Odd excitation of symmetric multimode interference structures
    S El-Sabban, D Khalil
    Applied Optics 58 (14), 3836-3843 , 2019
    2019
    Citations: 1
  • Multi-granularity grooming using timing information in optical networks with waveband and TDM switching
    S El-Sabban, GAFM Khalaf
    Ain Shams Engineering Journal 5 (2), 433-448 , 2014
    2014
    Citations: 1
  • Multi-ring resonator shared bus structures for optical communications
    DAM Khalil, SAFA El-Sabban, SA Ibrahim
    US Patent App. 19/259,355 , 2026
    2026