Modal noise simulations due to high frequency VCSEL numerical aperture fluctuations

Shanalyn A. Kemme, Raymond K. Kostuk

Research output: Contribution to journalConference articlepeer-review


We have experimentally identified and characterized two dynamic components of a VCSEL/multimode optical fiber link: 1) a high temporal frequency fluctuation of the VCSEL's numerical aperture (NA) and, 2) source power spectrum shift in time (chirp) both upon ac modulation. We use these variables of the excitation irradiance distribution at a fiber input to simulate the resulting modal noise; without the typical assumptions that all fiber modes are equally filled and all relative fiber mode delays are equally probable. Results indicate that fluctuations in the NA can generate significant modal noise at the fiber output. On the other hand, source chirp, in the presence of mode selective loss, is only moderately effective in generating modal noise. Moreover, since chirping increases with the VCSEL's series resistance, it's significance will diminish as design efforts to decrease the potential drop across the VCSEL are successful.

Original languageEnglish (US)
Pages (from-to)45-52
Number of pages8
JournalProceedings of SPIE - The International Society for Optical Engineering
StatePublished - 1998
EventOptoelectronic Interconnects V - San Jose, CA, United States
Duration: Jan 28 1998Jan 29 1998


  • Fiber coupling
  • Fiber optics
  • Modal noise
  • Optical interconnects
  • VCSELs

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Computer Science Applications
  • Applied Mathematics
  • Electrical and Electronic Engineering


Dive into the research topics of 'Modal noise simulations due to high frequency VCSEL numerical aperture fluctuations'. Together they form a unique fingerprint.

Cite this