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Título: | Diffusive turn-off transients in current modulated multitransverse mode VCSELs |
Autor: | Valle, Ángel CSIC ORCID ; Mulet, Josep CSIC; Pesquera, Luis CSIC ORCID ; Balle, Salvador CSIC ORCID | Palabras clave: | Semiconductor lasers Vertical cavity lasers Transverse modes Current modulation |
Fecha de publicación: | jun-2002 | Editor: | The International Society for Optics and Photonics | Citación: | Proceedings Spie 4649(Vertical-Cavity Surface-Emitting Lasers VI): 50-61 (2002) | Resumen: | Secondary 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. | Descripción: | 12 pages, 8 figures, 1 table. | Versión del editor: | http://spiedigitallibrary.aip.org/dbt/dbt.jsp?KEY=PSISDG&Volume=4649&Issue=1&bproc=volrange&scode=4600+-+4699 | URI: | http://hdl.handle.net/10261/18029 | ISSN: | 0277-786X |
Aparece en las colecciones: | (IMEDEA) Artículos (IFCA) Artículos (IFISC) Artículos |
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