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| Author(s): |
Guilherme Fórnias Machado de Rezende
Total Authors: 1
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| Document type: | Doctoral Thesis |
| Press: | Campinas, SP. |
| Institution: | Universidade Estadual de Campinas (UNICAMP). Instituto de Física Gleb Wataghin |
| Defense date: | 2023-05-29 |
| Examining board members: |
Newton Cesário Frateschi;
Pierre Louis de Assis;
Christiano José Santiago de Matos;
Ben Hur Viana Borges;
Gustavo Silva Wiederhecker
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| Advisor: | Newton Cesário Frateschi |
| Abstract | |
In this work, we report on the design, fabrication, and characterization of heterogeneously integrated III-V-on-Si lasers with resonant mirrors due to photonic molecules, that is, coupled cavities. Three SOI microrings coupled together form an effective reflection in the waveguide that feeds them and serve as mirrors for an active, Fabry-Perot-like cavity. On one hand, the cross section of the silicon photonics components is formed by rib waveguides, with a 180nm cap on top of 220nm Si slab layer, with width of 600nm. On the other hand, the 3-µm wide III-V waveguides are composed of six InGaAsP quantum wells on an InP platform, epitaxially grown in inverted way, that is, from p to n-InP side, starting from the substrate. The coupling between III-V and SOI, bonded through a process of controlled thickness (80nm) of Benzocyclobutene (BCB) diluted in Mesitylene, is obtained by an inverted double tapering structure, in which the optical mode in SOI rises to the III-V waveguide. The manufactured lasers have a threshold current of 40mA, with peak power at 1571nm (in the L-band of optical telecommunications), up to -10dBm of output power measured in fiber, series resistance of 10 ? and side mode suppression ratio (SMSR) of 40dB. Possibilities of wide tuning, latching and linewidth reduction are speculated for future work, although not proven here. As an additional work, in the appendices, we address a generalized description of Coupled Mode Theory (CMT) deduced directly from the Transfer Matrix Method (TMM), through Graph Theory, in which the coupling topology of three or more optical cavities is analyzed, leading to the description of a new category of supermodes called "pseudo-dark", which may or may not be measured in the optical transmission spectrum depending on the topology (AU) | |
| FAPESP's process: | 16/03714-2 - Coupled Active Microresonators on hybrid Si/III-V platform |
| Grantee: | Guilherme Fornias Machado de Rezende |
| Support Opportunities: | Scholarships in Brazil - Doctorate |