Comb-based Characterization of Photonic Devices
Licentiate thesis, 2022

Integrated photonics has been one of the fastest-growing fields in science. Measuring photonic devices in amplitude and phase (i.e. complex response) provides insight into their performance. Swept-wavelength interferometry is a prominent technique for the broadband characterization of the complex response. It leverages continuous advances in rapidly tunable laser sources, but is prone to systematic errors associated to the calibration of the frequency. This thesis focuses on the non-destructive characterization of ultralow-loss photonic devices using swept wavelength interferometric technique. We overcome issues associated to nonlinear tuning by calibrating the frequency of the laser with the aid of a frequency comb. We apply the concept to diverse components of relevance including microresonators and spiral waveguides. In addition, we provide an overview and comparative assessment of the state of the art in the field.

frequency combs

microcombs

waveguides

stepped-heterodyne technique

swept-wavelength interferometry

optical frequency domain spectroscopy

microresonators

Luftbryggan
Opponent: Timur Shegai (Chalmers)

Author

Krishna Sundar Twayana

Chalmers, Microtechnology and Nanoscience (MC2), Photonics

Spectral Interferometry with Frequency Combs

Micromachines,; Vol. 13(2022)

Review article

Frequency-Comb-Assisted Swept-Wavelength Interferometry

2021 Conference on Lasers and Electro-Optics Europe and European Quantum Electronics Conference, CLEO/Europe-EQEC 2021,; (2021)

Paper in proceeding

Dark-Soliton Engineering in Microresonator Frequency Combs (DarkComb)

European Commission (EC) (EC/H2020/771410), 2018-05-01 -- 2023-04-30.

Subject Categories

Accelerator Physics and Instrumentation

Atom and Molecular Physics and Optics

Other Electrical Engineering, Electronic Engineering, Information Engineering

Areas of Advance

Nanoscience and Nanotechnology

Infrastructure

Nanofabrication Laboratory

Publisher

Chalmers

Luftbryggan

Opponent: Timur Shegai (Chalmers)

More information

Latest update

6/1/2022 1