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A note on the semiconductor laser equivalent circuit

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1 Author(s)
Flynn, E.J. ; Lucent Technologies, Murray Hill, New Jersey 07974

Your organization might have access to this article on the publisher's site. To check, click on this link:http://dx.doi.org/+10.1063/1.369499 

The small-signal rate equations for a semiconductor laser can be represented as a network of electrical components, as shown by Tucker and Kaminow [R. S. Tucker and I. P. Kaminow, J. Lightwave Technol. LT-2, 385 (1984)] for the case of finite gain compression Є≫0. However, a calculation of small-signal response curves δS/δI vs I derived from this equivalent circuit exhibit a linear decrease (“droop”) above threshold that is inconsistent with the dc solutions of the original rate equations. This problem flags a subtle flaw in the formulation of the circuit model. We observe, moreover, that the expression for the resonance damping parameter used throughout the laser literature follows exactly from this same RLC circuit model. The derivation of the circuit model from the rate equations is revisited. Consistency between the dc and ac solutions is achieved when the differential of the net gain δ{G/(1+ЄS)} is appropriately represented as a shunt element with zero admittance. The corrected circuit model resolves the “droop” problem in the small-signal δS/δI vs I relation. As expected, the new circuit model leads to a modified expression for the damping parameter. © 1999 American Institute of Physics.

Published in:

Journal of Applied Physics  (Volume:85 ,  Issue: 4 )

Date of Publication:

Feb 1999

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