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Concept of linewidth enhancement factor in semiconductor lasers: its usefulness and limitations

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2 Author(s)
Agrawal, G.P. ; Inst. of Opt., Rochester Univ., NY, USA ; Bowden, C.M.

The usefulness and the limitations of the concept of the linewidth enhancement factor alpha in semiconductor lasers are examined by considering the laser dynamics without the rate-equation approximation. The rate equations with a constant value of alpha can be used for semiconductor lasers operating continuously or modulated directly such that the carrier density does not change significantly during each modulation cycle. A new set of generalized Bloch equations should be used whenever subpicosecond optical pulses are involved.<>

Published in:

Photonics Technology Letters, IEEE  (Volume:5 ,  Issue: 6 )