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Modulation Bandwidth and Linewidth Enhancement Factor of High-Speed 1.55- \mu m Quantum-Dash Lasers

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3 Author(s)
Hein, S. ; Tech. Phys., Univ. Wurzburg, Wurzburg ; Hofling, Sven ; Forchel, A.

InAs-InGaAlAs-InP quantum-dash lasers have been fabricated showing continuous-wave operation up to 100degC with a characteristic temperature of 88 K between 25degC and 85degC and output powers above 27 mW at room temperature (RT). The small-signal modulation bandwidth of 10 GHz at RT amounts still to 4 GHz at 85degC. The linewidth enhancement factor above threshold is evaluated by means of the frequency-modulation/amplitude-modulation method in dependence on modulation frequency and drive current, exhibiting a value of 2.5 slightly above threshold.

Published in:

Photonics Technology Letters, IEEE  (Volume:21 ,  Issue: 8 )