DTA

Master di Primo Livello

MUKIT, MOHAMMAD

etd-08242020-160240

Modeling and Optimization of Photonic Integrated Devices Based on Novel Optical Material Titanium Dioxide for Telecom and Datacom Application

Istituto di Tecnologie della Comunicazione, dell'Informazione e della Percezione

Corsi Alta Formazione - PHOTONIC INTEGRATED CIRCUITS, SENSORS AND NETWORKS (PIXNET)

relatore Dott. CALABRETTA, NICOLA
Relatore Prof. CASTOLDI, PIERO

• directional coupler
• grating coupler
• integrated photonics
• inverse adiabatic taper coupler
• spot size converter
• TiO2
• waveguide

08/09/2020;

parziale

We present Titanium Dioxide (TiO2) as a promising material for a variety of integrated photonic applications. Using a combination of simulators, we modeled and proposed a single mode polarization independent waveguide, a single mode multi-band waveguide, directional couplers for both 100/0 and 50/50 power splitting ratio, two different structures of grating couplers, and an inverse adiabatic taper coupler. The study of the waveguide was carried out for optical wave propagation simulation results based on finite difference method. The directional coupler is designed with a combination of curved and straight coupled waveguide sections, where up to 98% coupling efficiency can be achieved with the proposed design. Grating coupler of two distinct structures is proposed; for the gratings without top cladding, up to 45% coupling efficiency and with the top cladding up to 50% coupling efficiency can be achieved. The study of grating coupler was carried out with numerical simulation based on finite difference time domain method. Finally, an of inverse adiabatic taper coupler consisting of spot size converter from TiO2 to BCB waveguide is proposed which allows more than 95% coupling efficiency. Calculations for inverse adiabatic taper coupler were performed with an eigenmode expansion method by Fimmwave/Fimmprop software.

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