Dynamic coherence measurements of index- and gain-guided VCSELs

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...

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Bibliographic Details
Published inIEEE photonics technology letters Vol. 9; no. 5; pp. 554 - 556
Main Authors Kemme, S.A., Kostuk, R.K., Chun, C.K.Y.
Format Journal Article
LanguageEnglish
Published IEEE 01.05.1997
Subjects
Coherence
Gain measurement
Optical interconnections
Optical modulation
Optical noise
Optical sensors
Semiconductor device noise
Stimulated emission
Surface emitting lasers
Vertical cavity surface emitting lasers
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Summary: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.
Bibliography:ObjectType-Article-2
SourceType-Scholarly Journals-1
ObjectType-Feature-1
content type line 23
ISSN:1041-1135
1941-0174
DOI:10.1109/68.588092