Numerical Study of the Single Mode Stability of Quantum Well and Quantum Dot DFB Laser Diodes Under External Optical Feedback

We numerically analysed the single mode stability of of multi quantum well and quantum dot DFB laser diodes in the presence of external optical feedback. Laser diodes which operate in a stable single mode in the absence of feedback were found to sometimes become multimode for external feedback level...

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Bibliographic Details
Published in:IEEE photonics journal 2023-06, Vol.15 (3), p.1-4
Main Author: Morthier, G.
Format: Article
Language:English
Subjects:
Coherence
DFB laser diode
Diodes
Distributed feedback lasers
feedback sensitivity
Laser feedback
Laser modes
Laser stability
Multi Quantum Wells
Optical feedback
quantum dot
Quantum dot lasers
Quantum dots
quantum well
Reflection
Semiconductor lasers
single mode stability
Stability analysis
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Summary:We numerically analysed the single mode stability of of multi quantum well and quantum dot DFB laser diodes in the presence of external optical feedback. Laser diodes which operate in a stable single mode in the absence of feedback were found to sometimes become multimode for external feedback levels below −30 dB. This is even the case for lasers with zero linewidth enhancement factor, even though such lasers are sometimes touted as feedback insensitive. The behavior depends strongly on the phase of the external reflection, as well as on the specific DFB laser structure.
ISSN:1943-0655
1943-0655
1943-0647
DOI:10.1109/JPHOT.2023.3281513