Gain switching of monolithic 1.3 μm InAs/GaAs quantum dot lasers on silicon
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Authors
Liao, M
Publication Date
2018-09-15Journal Title
Journal of Lightwave Technology
ISSN
0733-8724
Publisher
Institute of Electrical and Electronics Engineers (IEEE)
Volume
36
Issue
18
Pages
3837-3842
Type
Article
Metadata
Show full item recordCitation
Hantschmann, C., Vasilyev, P., Chen, S., Liao, M., Seeds, A., Liu, H., Penty, R., & et al. (2018). Gain switching of monolithic 1.3 μm InAs/GaAs quantum dot lasers on silicon. Journal of Lightwave Technology, 36 (18), 3837-3842. https://doi.org/10.1109/JLT.2018.2851918
Abstract
© 1983-2012 IEEE. We report the first demonstration of gain-switched optical pulses generated by continuous-wave 1.3 μm InAs/GaAs quantum dot (QD) broad-area lasers directly grown on silicon. The shortest observed pulses have typical durations between 175 and 200 ps with peak output powers of up to 66 mW. By varying the drive current pulsewidth and amplitude systematically, we find that the peak optical power is maximized through sufficiently long high-amplitude drive pulses, whereas shorter drive pulses with high amplitudes yield the narrowest achievable pulses. A three-level rate equation travelling-wave model is used for the simulation of our results in order to gain a first insight into the underlying physics and the laser parameters responsible for the observed behavior. The simulations indicate that a limited gain from the InAs QDs and a very high gain compression factor are the main factors contributing to the increased pulsewidth. As the optical spectra of the tested broad-area QD laser give a clear evidence of multitransverse-mode operation, the laser's dynamic response could be additionally limited by transversal variations of the gain, carrier density, and photon density over the 50 μm wide laser waveguide.
Sponsorship
Engineering and Physical Sciences Research Council (EP/H022384/1)
Identifiers
External DOI: https://doi.org/10.1109/JLT.2018.2851918
This record's URL: https://www.repository.cam.ac.uk/handle/1810/285955
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