Free-space mid-infrared optical links using quantum cascade lasers

Rainer Martini, Clyde Bethea, Federico Capasso, Claire F. Gmachl, Roberto Paiella, Edward A. Whittaker, Harold Y. Hwang, Deborah L. Sivco, James N. Baillargeon, Alfred Y. Cho

Research output: Contribution to journalConference articlepeer-review


We present experimental results for an optical free-space high-speed link using direct modulated mid-infrared (λ = 8.1 μm) quantum cascade lasers. A stable link was realized over a distance of 200m and QPSK encoded multimedia data were transmitted and received error-free, incorporating several hundred digitally encoded multimedia channels. The reliability of the system against weather influence (fog) was experimentally compared to that of a near-infrared (λ = 0.85 μm) link. Under clear weather conditions comparable results were obtained in both links. However, a higher stability of the MIR link was clearly observed under a dense fog situation.

Original languageEnglish (US)
Pages (from-to)20-24
Number of pages5
JournalProceedings of SPIE - The International Society for Optical Engineering
StatePublished - 2003
EventPROCEEDINGS OF SPIE SPIE - The International Society for Optical Engineering: Free-Space Laser Communication Technologies XV - San Jose, CA, United States
Duration: Jan 28 2003Jan 28 2003

All Science Journal Classification (ASJC) codes

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


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