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dc.contributor.authorValle, Ángelen_US
dc.contributor.authorMulet, Josepen_US
dc.contributor.authorPesquera, Luisen_US
dc.contributor.authorBalle, Salvadoren_US
dc.identifier.citationProceedings Spie 4649(Vertical-Cavity Surface-Emitting Lasers VI): 50-61 (2002)en_US
dc.description12 pages, 8 figures, 1 table.-
dc.description.abstractSecondary 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.en_US
dc.description.sponsorshipFinancial support has been provided by CICYT (Spain) Project T1C99-0645 and by EC Human Potential Research Training Network VISTA (HPRN CT-2000-00034).-
dc.format.extent2373 bytes-
dc.format.extent330622 bytes-
dc.format.extent43785 bytes-
dc.publisherSociety of Photo-Optical Instrumentation Engineers-
dc.subjectSemiconductor Lasers-
dc.subjectVertical cavity lasers-
dc.subjectTransverse modes-
dc.subjectCurrent modulation-
dc.titleDiffusive turn-off transients in current modulated multitransverse mode VCSELsen_US
dc.description.peerreviewedPeer revieweden_US
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