DTA

Digital Theses Archive

 

Tesi etd-08192020-204920

Type of thesis
Master univ. I liv.
Author
FEYISA, DESALEGN WOLDE
URN
etd-08192020-204920
Title
Design and Characterization of InP SOA based 8×8 High-Speed WDM Space Switch
Structure
Istituto di Tecnologie della Comunicazione, dell'Informazione e della Percezione
Course
Corsi Alta Formazione - PHOTONIC INTEGRATED CIRCUITS, SENSORS AND NETWORKS (PIXNET)
Committee
relatore STABILE, PATTY
Relatore CASTOLDI, PIERO
Keywords
  • Optical space switch
  • Photonic integration
  • Semiconductor optical amplifier
Exam session start date
;
Availability
parziale
Abstract
Nowadays, broadband and fast optical space switch play a crucial role in optical networks. This project aimed to characterize and improve the design of the optical space switch. A wide bandwidth, compact, and fast monolithically integrated InP/InGaAsP strictly nonblocking optical space switch actuated by semiconductor optical amplifiers (SOA) gates was designed, fabricated via the generic InP technology and characterized. The SOA gain, component losses, and switching properties of the optical switch are analyzed. The gain of three SOAs on a path was measured to be 31 dB on average and is enough to compensate on-chip component losses whenever a reasonable number of waveguide crossings are encountered (< 25). The loss analysis shows that waveguide crossing dominates the path dependent loss. An optical signal to noise ratio (OSNR) and extinction ratio (ER) as large as 42.4 dB and 37.6 dB, respectively, are obtained in the best path. A new optimized chip layout design is proposed to reduce the on-chip loss with a significant reduction of the number of waveguide crossing. The performance can be further improved with a design of lower loss waveguide crossing. These results pave the way to scale the switch to higher port counts by using this switch as a building block on a modular basis. Additionally, the use of ultra-compact bends and the number of components integrated on this single chip also shows to be promising for achieving compact optical switches in generic technology.
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