Polarization management : an efficient polarization rotator splitter on silicon-on-insulator platform

Authors: Sherafati, Bahareh
Advisor: Rusch, LeslieShi, Wei
Abstract: This thesis aims to study polarization management, and focuses on design, simulation and fabrication layout of a polarization splitter rotator (PSR) on silicon platforms by utilizing a structure combining an adiabatic bi-level taper and an adiabatic coupler. Following an introduction about optical communication systems and specifically integrated photonic systems, we introduce silicon-on-isolator (SOI) as the most attractive platform for our integrated photonic circuit. Although the intrinsic high-index contrast property of SOI leads to a very small footprint, this property also results in high polarization dependence for silicon photonic (SiP) devices. To solve the problem and remove this dependency, polarization diversity circuits have been proposed and it is important to deal with on-chip polarization management. In this thesis, the general operating principle of polarization management is thoroughly studied. As polarization rotation is the most important function of polarization management, we concentrate on the basic principles of polarization rotation in a single section device. We also discuss different types of polarization rotators and give an introduction to the historic evolution of polarization rotators. Finally, polarization beam splitters are introduced as the second important element in polarization management, and different types of polarization splitters are presented. To efficiently manage polarization, it is critical to develop a high performance PSR. Therefore, we introduce an efficient structure that is based on TM0-TE1 mode conversion in a bi-level taper on SOI. We explain and motivate that choice. Afterwards, we describe the modeling in Finite Difference Time Domain (FDTD) Lumerical software; simulation results provide the evolution of mode intensity profiles along the device. Subsequently, we present the layout details for fabrication and eventual characterization for designs using edge couplers, as well as designs using grating couplers. To evaluate the performance of the designed PSR for two different applications, we propose a mathematical model and the transfer matrices. Finally, the performance of the proposed PSR is analyzed in an optical communication system.
Document Type: Mémoire de maîtrise
Issue Date: 2018
Open Access Date: 3 August 2018
Permalink: http://hdl.handle.net/20.500.11794/30518
Grantor: Université Laval
Collection:Thèses et mémoires

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