Low-threshold 1.5 μm compressive-strained multiple- andsingle-quantum-well lasers |
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Authors: | Zah C.-E. Bhat R. Favire F.J. Jr. Menocal S.G. Andreadakis N.C. Cheung K.-W. Hwang D.-M.D. Koza M.A. Lee T.-P. |
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Affiliation: | Bellcore, Red Bank, NJ; |
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Abstract: | 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 |
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