Transverse modes under external feedback and fiber coupling efficiencies of VCSEL's

descriptionPublicationkeyboard_double_arrow_right Article 01 Oct 1998Publisher:Institute of Electrical and Electronics Engineers (IEEE)Journal:IEEE Photonics Technology Letters, volume 10, pages 1,365-1,367 (issn: 1041-1135, eissn: 1941-0174,

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Authors: J. Heinrich; H. Zeeb; K.J. Ebeling;

doi: 10.1109/68.720262

Transverse modes under external feedback and fiber coupling efficiencies of VCSEL's

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Abstract

We report a detailed study on the transverse mode behavior of vertical-cavity surface-emitting lasers (VCSEL's) under strong external feedback. Backreflections from a glass facet result, periodically depending on the feedback phase, in variations of the transverse mode pattern of strongly index guided multitransverse-mode-emitting lasers. As a result, butt-coupling efficiencies of these lasers strongly depend on laser-fiber distance. For typical active VCSEL diameters around 15-/spl mu/m fiber-coupled powers into standard 50 /spl mu/m-core diameter graded-index (GI) silica fibers vary by nearly 10 dB. Even for high-numerical aperture 100-/spl mu/m-core diameter fibers, power variations of up to 2 dB are observed.

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