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Linewidth and alpha-factor of detuned-loaded DBR lasers

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3 Author(s)
Verdiell, J.-M. ; AT&T Bell Lab., Holmdel, NJ, USA ; Koren, Uziel ; Koch, T.L.

The authors report measurements of the alpha -factor and linewidth of DBR (distributed Bragg reflector) lasers fabricated with weak grating constants. Such devices exhibit detuned-loading effects, and the measured values depend strongly on the tuning current of the Bragg section. alpha -factor behavior is found to agree with earlier theoretical predictions. Linewidth behavior is shown to be dominated by carrier shot noise in the tuning section. A theoretical analysis of the DBR laser is outlined including detuned loading and carrier shot noise effect.<>

Published in:

Photonics Technology Letters, IEEE  (Volume:4 ,  Issue: 4 )