VCSELs emerge as low-cost alternatives to edge-emitters

Christian Lauer, Markus Maute, Werner Hofmann, Markus Christian Amann

Research output: Contribution to specialist publicationArticle

2 Scopus citations

Abstract

The use of vertical-cavity surface-emitting lasers (VCSEL) which are emerging as low-cost alternative for that application is discussed. VCSEL circular output beam which yields good fiber-coupling efficiency and inherent longitudinal single-mode operation because of its short-cavity compared to edge-emitters with hundreds of microns of gain path. VCSEL tend to oscillate in densely spaced higher-order transverse modes for high current densities and large active areas, limiting single-mode output power. VCSEL can be directly modulated at up-to 10 Gbit/s with wide open eye diagrams. Vertical cavity lasers also make ideal sources for trace-gas sensing using tunable laser diode absorption spectroscopy.

Original languageEnglish
Pages127-131
Number of pages5
Volume41
No6
Specialist publicationLaser Focus World
StatePublished - Jun 2005

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