Dynamic coherence measurements of index- and gain-guided VCSEL's

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

Research output: Contribution to journalArticlepeer-review

6 Scopus citations


Coherence properties of several different types of VCSEL's 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 VCSEL's 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 VCSEL's have similar coherence lengths when operated dc and modulated, and shorter than that of the single transverse-mode VCSEL's. Gain-guided multiple transverse-mode VCSEL's also have shorter coherence lengths than single transverse-mode VCSEL's and under modulation can have coherence lengths as low as 0.5 cm.

Original languageEnglish (US)
Pages (from-to)554-556
Number of pages3
JournalIEEE Photonics Technology Letters
Issue number5
StatePublished - May 1997


  • Coherence length
  • Modal noise
  • Multiple transverse mode VCSEL's
  • Optical interconnections
  • Optical spectra
  • Vertical-cavity surface-emitting lasers (VCSEL's)

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Atomic and Molecular Physics, and Optics
  • Electrical and Electronic Engineering


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