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Electrically pumped continuous-wave O-band quantum-dot superluminescent diode on silicon

Lu, Y; Cao, V; Liao, M; Li, W; Tang, M; Li, A; Smowton, P; ... Chen, S; + view all (2020) Electrically pumped continuous-wave O-band quantum-dot superluminescent diode on silicon. Optics Letters , 45 (19) p. 5468. 10.1364/ol.401042. Green open access

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Abstract

High-power, broadband quantum-dot (QD) superluminescent diodes (SLDs) are ideal light sources for optical coherence tomography (OCT) imaging systems but have previously mainly been fabricated on native GaAs- or InP-based substrates. Recently, significant progress has been made to emigrate QD SLDs from native substrates to silicon substrates. Here, we demonstrate electrically pumped continuous-wave InAs QD SLDs monolithically grown on silicon substrates with significantly improved performance thanks to the achievement of a low density of defects in the III-V epilayers. The fabricated narrow-ridge-waveguide device exhibits a maximum 3 dB bandwidth of 103 nm emission spectrum centered at the O-band together with a maximum single facet output power of 3.8 mW at room temperature. The silicon-based SLD has been assessed for application in an OCT system. Under optimized conditions, a predicted axial resolution of ∼5.3µm is achieved with a corresponding output power of 0.66 mW/facet.

Type: Article
Title: Electrically pumped continuous-wave O-band quantum-dot superluminescent diode on silicon
Open access status: An open access version is available from UCL Discovery
DOI: 10.1364/ol.401042
Publisher version: https://doi.org/10.1364/OL.401042
Language: English
Additional information: This version is the author accepted manuscript. For information on re-use, please refer to the publisher's terms and conditions.
UCL classification: UCL
UCL > Provost and Vice Provost Offices
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science > Dept of Electronic and Electrical Eng
URI: https://discovery.ucl.ac.uk/id/eprint/10110081
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