Title :
Bistability in bipolar cascade VCSELs
Author :
Knodl, T. ; Golling, M. ; Michalzik, Rainer ; Ebeling, K.J.
Author_Institution :
Dept. of Optoelectron., Ulm Univ.
fDate :
4/11/2002 12:00:00 AM
Abstract :
Measurement results on the formation of bistability loops in light versus current and current versus voltage characteristics of two-stage bipolar cascade vertical-cavity surface-emitting lasers (VCSELs) are presented. It is observed that the bistable behaviour is the more pronounced the more the cavity resonance is blueshifted with respect to the gain maximum of the quantum wells. In addition, the slope efficiency increases by more than a factor of 1.5 compared to conventional VCSELs owing to carrier recycling
Keywords :
optical bistability; optical saturable absorption; quantum well lasers; spectral line shift; surface emitting lasers; In0.2Ga0.8As-GaAs; bipolar cascade VCSEL; bistability loops; blueshift; carrier recycling; cavity resonance; current versus voltage characteristics; gain maximum; light versus current characteristics; quantum wells; saturable absorption; slope efficiency; two-stage bipolar cascade vertical-cavity surface-emitting lasers;
Journal_Title :
Electronics Letters
DOI :
10.1049/el:20020238
