Dynamic properties of wavelength switching in a widely tunable semiconductor laser for optical coherence tomography

Rastko Pajković, Daniel Garbi, Kevin Williams, Erwin Bente

Research output: Chapter in Book/Report/Conference proceedingConference contributionAcademicpeer-review


We present results on the investigation of the dynamics of wavelength switching in a monolithically integrated widely tunable semiconductor ring laser for application in swept source optical coherence tomography. In this application wavelength switching within several tens of nanoseconds is desirable to reduce motion blur artefacts during imaging. The device under test is realized in an InGaAsP/InP platform, operates around 1530 nm wavelength and has been shown to have a tuning range over 50 nm. Both measurements and simulations of the wavelength switching behavior of the laser are presented. Tuning is achieved using voltage controlled electro-refractive phase modulators with a response faster than 1 GHz and negligible residual thermal tuning. The fastest switching strategy, of the three that we compare in our simulations, is shown to be the one that relies on rapid power-off of the origin wavelength. The longitudinal cavity mode position, that has an important impact on the switching time and switching stability, is shown to be hard to predict after switching due to gain-phase coupling in the amplifier.

Original languageEnglish
Title of host publicationSemiconductor Lasers and Laser Dynamics IX
EditorsMarc Sciamanna, Rainer Michalzik, Krassimir Panajotov, Sven Hofling
Number of pages8
ISBN (Electronic)9781510634848
Publication statusPublished - 1 Jan 2020
EventSemiconductor Lasers and Laser Dynamics IX 2020 - None, France
Duration: 6 Apr 202010 Apr 2020

Publication series

NameProceedings of SPIE - The International Society for Optical Engineering
ISSN (Print)0277-786X
ISSN (Electronic)1996-756X


ConferenceSemiconductor Lasers and Laser Dynamics IX 2020


FundersFunder number
European Union 's Horizon 2020 - Research and Innovation Framework Programme721766


    • Time domain simulation
    • Wavelength scan
    • Wavelength switching time


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