HYBRID EVENT: You can participate in person at Rome, Italy or Virtually from your home or work.

8th Edition of

International Conference on Materials Science and Engineering

March 10-12, 2025 | Rome, Italy

Materials 2023

Dror Malka

Speaker at Materials Science and Engineering 2023 - Dror Malka
Holon Institute of Technology, Israel
Title : Combining SiN MMI waveguides based on slot waveguide technology


Optical transceivers that function under a high-speed rate condition are demanded to have more optical power ability to overcome the power losses which is a cause of the need of using a larger RF line connected to the Mach-Zehnder modulator for fulfilling the high-speed condition. The classic solution to this problem is to use a better power laser with a high level of 120 milliwatts. However, this solution can be complicated for a photonic chip circuit due to the high cost and nonlinear effects, which can increase the system noise. Therefore, we propose a better solution to increase the power level using a 4x1 power combiner which is based on multimode interference (MMI) using a silicon nitride slot waveguide structure. The combiner was solved using the full-vectorial beam propagation method and the key parameters were analyzed using Matlab script codes. Results show that the combiner can function well over the O-band spectrum with high combiner efficiency of at least 98.1% and after a short light coupling propagation of 28.8 μm. This new study shows how it is possible to obtain a transverse electric mode solution for four Gaussian coherent sources using silicon nitride slot waveguides technology. Furthermore, the back reflection (BR) was solved using a finite difference time domain method and the result shows a low BR of 40.1 dB. This new technology can be utilized for combining multiple coherent sources that work with a photonic chip at the O-band range.

Audience take away:

  • It will help to understand how to combined waveguides using MMI technology
  • It will help them to design silicon photonic chips.
  • Yes, it can be used to improve the power losses which is a cause of the need of using a larger RF line
  • Yes, it will improve the accuracy of the slot-waveguide design.


Dror Malka received his BSc and MSc degrees in electrical engineering from the Holon Institute of Technology (HIT) in 2008 and 2010, respectively, Israel. He has also completed a BSc degree in Applied Mathematics at HIT in 2008 and received his Ph.D. degree in electrical engineering from Bar-Ilan University (BIU) in 2015, Israel. Currently, he is a Senior Lecturer in the Faculty of Engineering at HiT. His major fields of research are nanophotonics, super-resolution, silicon photonics and fiber optics. He has published around 50 refereed journal papers, and 50 conference proceedings papers.