The effect of barrier composition on the vertical carrier transport and lasing properties of 1.55-mu m multiple quantum-well structures
2006 (English)In: IEEE Journal of Quantum Electronics, ISSN 0018-9197, Vol. 42, no 7, 713-714 p.Article in journal (Refereed) Published
In this paper, the effect of barrier bandgap and composition on the optical performance of 1.55-mu m InGaAsP/In-GaAsP and InGaAsP/InGaAlAs multiple quantum-well structures and Fabry-Perot lasers is evaluated experimentally. Direct vertical carrier transport measurements were performed through strain-compensated multiple quantum-well (MQW) test structures using femto-second laser pulse excitation and time-resolved photoluminescence up-conversion method. MQW test structures were grown with different barrier composition (InGaAsP and InGaAlAs) and barrier bandgap (varied from lambda(g) = 1440 to 1260 nm) having different conduction band Delta E-c and valence band discontinuity Delta E-v, while keeping the same InGaAsP well composition for all the structures. The ambipolar carrier transport was found to be faster in the structures with lower valence band discontinuity Delta E-v. Regrown semi-insulating buried heterostructure Fabry-Perot (SIBH-FP) lasers were fabricated from similar QWs and their static light-current-voltage characteristics (including optical gain and chirp spectra below threshold) and thermal characteristics were measured. Lasers with InGaAlAs barrier showed improved high-temperature operation, higher optical gain, higher differential gain, and lower chirp, making them suitable candidates for high-bandwidth directly modulated uncooled laser applications.
Place, publisher, year, edition, pages
2006. Vol. 42, no 7, 713-714 p.
Carrier transport; Fabry-Perot laser; InGaAIAs; InGaAsP; Quantum well (QW); Time-resolved photo luminescence
IdentifiersURN: urn:nbn:se:kth:diva-24236DOI: 10.1109/JQE.2006.87670ISI: 000239404700013ScopusID: 2-s2.0-51849096527OAI: oai:DiVA.org:kth-24236DiVA: diva2:345851
QC 201008272010-08-272010-08-272010-08-27Bibliographically approved