Dynamic coherence measurements of index- and gain-guided VCSELs

Author

Kemme, S.A. ; Kostuk, R.K. ; Chun, C.K.Y.

Author_Institution

Opt. Sci. Center, Arizona Univ., Tucson, AZ, USA

Volume

9

Issue

5

fYear

1997

fDate

5/1/1997 12:00:00 AM

Firstpage

554

Lastpage

556

Abstract

Coherence properties of several different types of VCSELs are examined with constant and modulated injection current with a bandwidth typical of that used in telecommunications. Large signal modulation of index-guided single transverse-mode VCSELs is found to reduce the coherence length by more than a factor of ten relative to the direct current configuration. Multiple transverse-mode index-guided VCSELs have similar coherence lengths when operated dc and modulated, and shorter than that of the single transverse-mode VCSELs. Gain-guided multiple transverse-mode VCSELs also have shorter coherence lengths than single transverse-mode VCSELs and under modulation can have coherence lengths as low as 0.5 cm.

Keywords

coherence length; electro-optical modulation; laser cavity resonators; laser modes; laser noise; light coherence; optical transmitters; quantum well lasers; refractive index; semiconductor device noise; surface emitting lasers; bandwidth; coherence length; coherence lengths; direct current configuration; dynamic coherence measurements; gain-guided VCSELs; gain-guided multiple transverse-mode VCSELs; index-guided VCSELs; index-guided single transverse-mode VCSELs; large signal modulation; modulated injection current; multiple transverse-mode index-guided VCSELs; shorter coherence lengths; similar coherence lengths; single transverse-mode VCSELs; telecommunications; Coherence; Gain measurement; Optical interconnections; Optical modulation; Optical noise; Optical sensors; Semiconductor device noise; Stimulated emission; Surface emitting lasers; Vertical cavity surface emitting lasers;

fLanguage

English

Journal_Title

Photonics Technology Letters, IEEE

Publisher

ieee

ISSN

1041-1135

Type

jour

DOI

10.1109/68.588092

Filename

588092