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Low-threshold 1.5 μm compressive-strained multiple- and single-quantum-well lasers

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9 Author(s)
C. -E. Zah ; Bellcore, Red Bank, NJ, USA ; R. Bhat ; F. J. Favire ; S. G. Menocal
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Design considerations for low-threshold 1.5-μm lasers using compressive-strained quantum wells are discussed. Parameters include transparency current density, maximum modal gain, bandgap wavelength, and carrier confinement. The optical confinement for a thin quantum well in the separate-confinement heterostructure (SCH) and the step graded-index separate-confinement heterostructure (GRINSCH) are analyzed and compared. 1.5-μm compressive-strained multiple- and single-quantum-well lasers have been fabricated and characterized. As a result of the compressive strain, the threshold current density is loss limited instead of transparency limited. By the use of the step graded-index separate-confinement heterostructure to reduce the waveguide loss, a low threshold current density of 319 A/cm2 was measured on compressive-strained single-quantum-well broad-area lasers with a 27 μ oxide stripe width

Published in:

IEEE Journal of Quantum Electronics  (Volume:27 ,  Issue: 6 )