Noise Correlation, Regenerative Amplification, and the Linewidth Enhancement Factor of a Vertical-Cavity Surface-Emitting Laser

This letter reports on amplitude and frequency noise correlation measurements as well as on optical injection experiments related to the linewidth enhancement factor a of a vertical- cavity surface-emitting laser (VCSEL). It is shown that the correlation in VCSELs is not dominated by alpha; conseque...

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Bibliographic Details
Published in:IEEE photonics technology letters 2008-05, Vol.20 (9), p.667-669
Main Authors: Fordell, T., Lindberg, A.M.
Format: Article
Language:English
Subjects:
Amplification
Correlation
Damping
Frequency estimation
Frequency measurement
Laser noise
Noise
Noise level
Noise measurement
Optical noise
Quantum-well lasers
Regenerative
Semiconductor device noise
Semiconductor lasers
Stimulated emission
Surface emitting lasers
Vertical cavity surface emission lasers
Vertical cavity surface emitting lasers
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Summary:This letter reports on amplitude and frequency noise correlation measurements as well as on optical injection experiments related to the linewidth enhancement factor a of a vertical- cavity surface-emitting laser (VCSEL). It is shown that the correlation in VCSELs is not dominated by alpha; consequently, such experiments yield very little information on its value. Measuring the regenerative amplification of a weak injected optical probe turned out to be a robust approach that can not only give accurately the relaxation oscillation frequency and the damping rate but a good estimate of alpha as well. Finally, these experiments are combined with previously published data to increase the number of techniques applied to the measurement of alpha of a single semiconductor laser up to 11.
ISSN:1041-1135
1941-0174
DOI:10.1109/LPT.2008.918910