Tapered waveguide InGaAs/InGaAsP multiple-quantum-well lasers |
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| Authors: | Koch TL Koren U Eisenstein G Young MG Oron M Giles CR Miller BI |
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| Affiliation: | AT&T Bell Lab., Holmdel, NJ; |
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| Abstract: | The use of ultrathin etch-stop techniques to expand the vertical optical mode size adiabatically in 1.5-μm InGaAs/InGaAsP MQW lasers using a tapered-core passive intracavity waveguide structure is discussed. 30% differential quantum efficiency out the tapered facet, far-field FWHM of ~12° and a butt-coupling efficiency into a cleaved fiber of -4.2 dB, with -1-dB alignment tolerances of ~±3 μm, were achieved |
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