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Analysis of the regimes of feedback effects in quantum dot laser

Lu, Ying; Hu, Xiao; Tang, Mingchu; Cao, Victoria; Yan, Jie; Wu, Dingyi; Park, Jae-seong; ... Chen, Siming; + view all (2022) Analysis of the regimes of feedback effects in quantum dot laser. Journal of Physics D: Applied Physics , 55 (48) , Article 484003. 10.1088/1361-6463/ac9689. Green open access

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Abstract

We investigated the optical feedback effects on the static and dynamic characteristics of 1.3 μm quantum-dot (QD) Fabry-Pérot (FP) laser under reflection from -40 dB up to -8 dB. The onset of coherence collapse is determined as -14 dB from the optical and electrical spectra. Although the degradation in small signal modulation is reported above this critical feedback level, transmission operation with available eye diagram under higher feedback is demonstrated. Under 10 Gb/s modulation, there is no obvious degradation in eye diagram regarding the eye shape and extinction ratio up to feedback ratio of -8 dB. The higher feedback tolerance of QD laser under large signal modulation is attributed to the impact of gain compression. This high-speed feedback-resistant operation also indicates that QD laser is a promising light source for isolator-free photonic integrated circuits.

Type: Article
Title: Analysis of the regimes of feedback effects in quantum dot laser
Open access status: An open access version is available from UCL Discovery
DOI: 10.1088/1361-6463/ac9689
Publisher version: https://doi.org/10.1088/1361-6463/ac9689
Language: English
Additional information: Original content from this work may be used under the terms of the Creative Commons Attribution 4.0 licence. Any further distribution of this work must maintain attribution to the author(s) and the title of the work, journal citation and DOI.
UCL classification: 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
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL
URI: https://discovery.ucl.ac.uk/id/eprint/10156836
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