Title : Combining SiN MMI waveguides based on slot waveguide technology
Abstract:
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.
