DTA

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Tesi etd-08192020-131648

Type of thesis
Master univ. I liv.
Author
AREAYA, BRHANU KAHSAY
URN
etd-08192020-131648
Title
Modeling and characterization of InP based Spot Size Converters
Structure
Istituto di Tecnologie della Comunicazione, dell'Informazione e della Percezione
Course
Corsi Alta Formazione - PHOTONIC INTEGRATED CIRCUITS, SENSORS AND NETWORKS (PIXNET)
Committee
relatore Dott. CALABRETTA, NICOLA
Relatore Prof. CASTOLDI, PIERO
Relatore Avv. PRIFTI, KRISTIF
Keywords
  • Adiabatic coupling
  • coupling loss
  • spot size converter
Exam session start date
;
Availability
completa
Abstract
Spot size converters have a crucial role in integrated optics. This project is aimed to characterize and propose a new design of the spot size converters. An experimental assessment of a set of spot-size converters, where the coupling loss, polarization-dependent loss, and the transmission characteristics were analyzed, is performed, and a coupling loss as low as 1 dB was obtained. Motivated by the experimental results as an initial guess, two modeling approaches are proposed: (a) when the fiber matched waveguide is defined by thick lightly doped InP layer and highly doped InP substrate, (b) when the fiber matched waveguide is defined by diluted InGaAsP/InP interleaved layers. The study and optimization of respective parameters were performed, and the second approach relatively gives better coupling with a coupling loss of 0.4 dB with a taper length of 2.2 μm.
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