On-chip single-output InAs quantum dot DFB laser for photonic integration

Albeladi, F. T., Qiao, D., Gillgrass, S., Albittar, N., Power, S., Allford, C. P. ORCID: https://orcid.org/0000-0002-3798-9014 and Smowton, P. M. ORCID: https://orcid.org/0000-0002-9105-4842 2026. On-chip single-output InAs quantum dot DFB laser for photonic integration. Optics Express 34 (14) , pp. 25538-25548. 10.1364/OE.604147

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Abstract

We present monolithically integrated InAs-QD DFB lasers incorporating a high-reflectivity multi-mode interference reflector (MMIR) for single-facet emission. The fabricated devices achieve over 6 mW single-mode laser output at room temperature, with a side-mode suppression ratio (SMSR) over 50 dB. Furthermore, control of the lasing mode and power is demonstrated by carrier injection to the MMIR section. This includes deliberate switching from multi-mode to single mode operation and lasing-wavelength selection at either side of the DFB stopband. A power attenuation, with extinction ratio (ER) over 50 dB is achieved for single-mode lasing as the MMIR section current injection is increased by <3 mA.

Item Type:	Article
Date Type:	Publication
Status:	Published
Schools:	Schools > Physics and Astronomy
Publisher:	Optica Publishing Group
ISSN:	1094-4087
Funders:	EPSRC
Projects:	EP/Z532848/1
Date of First Compliant Deposit:	8 July 2026
Date of Acceptance:	8 June 2026
Last Modified:	06 Oct 2026 21:16
URI:	https://orca.cardiff.ac.uk/id/eprint/188076

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