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A comparison of amplitude-phase coupling and linewidth enhancement in semiconductor quantum-well and bulk lasers

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3 Author(s)
B. Zhao ; Thomas J. Watson Sr. Lab. of Appl. Phys., California Inst. of Technol., Pasadena, CA, USA ; T. R. Chen ; A. Yariv

The amplitude-phase coupling factor α (linewidth enhancement factor) is compared for typical semiconductor quantum-well and bulk double heterostructure lasers. As a direct consequence of the reduction of the differential gain, there is no reduction of α in single-quantum-well lasers compared to bulk lasers. The number of quantum wells strongly affects the amplitude-phase coupling in quantum-well lasers. It is shown that the interband transition induced amplitude-phase coupling dominates that induced by the plasma effect of carriers in typical quantum-well lasers. By considering the spontaneous emission factor in the spectral linewidth, the authors show that there is an optimal number of quantum wells for achieving the narrowest spectral linewidth

Published in:

IEEE Journal of Quantum Electronics  (Volume:29 ,  Issue: 4 )