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Título

Diffusive turn-off transients in current modulated multitransverse mode VCSELs

AutorValle, Ángel ; Mulet, Josep; Pesquera, Luis ; Balle, Salvador
Palabras claveSemiconductor Lasers
Vertical cavity lasers
Transverse modes
Current modulation
Fecha de publicaciónjun-2002
EditorSociety of Photo-Optical Instrumentation Engineers
CitaciónProceedings Spie 4649(Vertical-Cavity Surface-Emitting Lasers VI): 50-61 (2002)
ResumenSecondary pulsations are an example of diffusive turn-off transients that can limit the performance of VCSELs in optical communication systems. Secondary pulsations are firstly analysed by using a model where a modal expansion of the electric field is performed. The maximum power of the secondary pulsations and the time at which they appear fluctuate when the spontaneous emission noise is present. A linear relation between the two previous quantities for each individual turn-off event is found. In the single-mode regime, the averaged maximum power during turn-off transients increases when increasing the injection current. However, in the multi-mode regime, the strength of secondary pulsations decreases when increasing the current. Secondary pulsations are also analysed by using a spatio-temporal description of the VCSEL dynamics, where the modal profiles are determined from the distribution of injected carriers and the thermal lens. This model also incorporates polarization effects and a frequency-dependent susceptibility. In this model, the carrier-induced refractive index changes increase the strength of secondary pulsations as compared to that obtained with the modal expansion. It is also shown that the use of ring-shaped electrical contact enhances the strength of secondary pulsations, while it decreases when multi-transverse mode operation is present.
Descripción12 pages, 8 figures, 1 table.
Versión del editorhttp://spiedigitallibrary.aip.org/dbt/dbt.jsp?KEY=PSISDG&Volume=4649&Issue=1&bproc=volrange&scode=4600+-+4699
URIhttp://hdl.handle.net/10261/18029
ISSN0277-786X
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