Dissipative Kerr solitons in normal dispersion waveguides
Licentiatavhandling, 2020

The microresonator comb (microcomb) is a laser source which generatesequally spaced coherent lines in the spectral domain. Having a miniaturefootprint and the potential of being low cost, it has attracted attention inmultiple applications. Demonstrations have included high-speed opticalcommunications, light detection and ranging, calibrating spectrographsfor exoplanet detection and optical clocks. These experiments relied onthe generation of dissipative Kerr solitons (DKS) which circulate in themicroresonator. The development of such waveforms is paramount forfurther advancement of the micrcomb.This thesis studies the dynamics of DKS in microresonators aim-ing at developing a low-cost, reliable and high-performing microcombsource. The investigation will cover both dark and bright DKS’s, whichare found respectively in normal and anomalous dispersion microres-onators. The dark DKS will be in center focus since it can providea relatively high comb power compared to other waveforms. The per-formance of microcombs in terms of line power is numerically exploredfor telecommunication purposes. The initiation of dark DKS from lin-early coupled microcavities is investigated, showing efficient, low-powergeneration from silicon nitride microresonators that are reproducible infabrication. These studies could facilitate reliable, low-powered, energy-efficient microcombs.


dissipative solitons

optical frequency combs

nonlinear optics

four-wave mixing

Kollektorn, Kemivägen 9 (MC2 building), Chalmers Password: 838498
Opponent: Senior Lecturer Cord Arnold, Atomic Physics, Lund University


Òskar Bjarki Helgason

Chalmers, Mikroteknologi och nanovetenskap (MC2), Fotonik

Superchannel engineering of microcombs for optical communications

Journal of the Optical Society of America B: Optical Physics,; Vol. 36(2019)p. 2013-2022

Artikel i vetenskaplig tidskrift

E. Nazemosadat, A. Fülöp, Ó. B. Helgason, P.-H. Wang, Y. Xuan, D. E. Leaird, M. Qi, E. Silvestre, A. M. Weiner and V. Torres-Company, "Switching dynamics of dark-pulse Kerr comb states in optical microresonators"

Ó. B. Helgason, F. R. Arteaga-Sierra, Z. Ye, K. Twayana, P. A. Andrekson, M. Karlsson, J. Schröder and V. Torres-Company, "Dissipative Kerr solitons in photonic molecules"

Mikroresonatorbaserade frekvenskamsgeneratorer för koherent kommunikatio

Vetenskapsrådet (VR), 2017-01-01 -- 2020-12-31.

Dark-Soliton Engineering in Microresonator Frequency Combs (DarkComb)

Europeiska kommissionen (EU), 2018-05-01 -- 2023-04-30.


Nanovetenskap och nanoteknik (SO 2010-2017, EI 2018-)


C3SE (Chalmers Centre for Computational Science and Engineering)


Atom- och molekylfysik och optik

Annan fysik

Annan elektroteknik och elektronik


Chalmers tekniska högskola

Kollektorn, Kemivägen 9 (MC2 building), Chalmers Password: 838498


Opponent: Senior Lecturer Cord Arnold, Atomic Physics, Lund University

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