Dr. Jozef Chovan Profile

Dr. Jozef Chovan

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Proceedings Article | 13 December 2022 Paper

Comparison of optical properties of 1×8 Y-branch and MMI splitter based on silicon nitride material platform

S. Serecunova, D. Seyringer, F. Uherek, J. Chovan, H. Seyringer

Proceedings Volume 12502, 125020F (2022) https://doi.org/10.1117/12.2662002

KEYWORDS: Waveguides, Polarization, Silicon, Signal attenuation, Optical properties, Optical simulations, Geometrical optics, Photonics, Beam splitters

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This paper describes two different designs of 1×8 passive optical splitters. The first splitter consists of cascade arranged directional waveguide branches (Y-branch splitter) with (0.8×0.16) µm² waveguide cross-section. The second splitter is based on multimode interference occurring in a large MMI coupler, which uses a self-imaging effect for beam propagation, exhibiting the same waveguide core size as a Y-branch splitter. The waveguide channel profile, used in both approaches, is based on a silicon nitride material platform, with a refractive index of core being n_c = 1.925 and a refractive index of cladding n_cl = 1.4575. The splitters are designed as a planar structure for a medical operating wavelength 850 nm. Design, simulation, and optimization of passive optical components are performed by a commercial photonic software tool BeamPROP simulation engine by RSoft Photonics Suite tool, employing beam propagation method. This work aims to find the minimum physical dimensions of the designed splitters with the satisfactory optical performance. According to the minimum insertion loss and minimum non-uniformity, the optimum length of the splitters is determined. Finally, the optical properties of splitters for both approaches are discussed and compared with each other.

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