Supermode Dynamics in Coherent VCSEL Arrays

Nusrat Jahan, William North, Kent D. Choquette

Research output: Chapter in Book/Report/Conference proceedingConference contribution


We study the supermode dynamics of optically coupled but electrically isolated dual-element photonic crystal vertical cavity surface emitting laser (VCSEL) arrays. The optical coupling is characterized by experimentally extracting a complex coupling coefficient, where the real component is related to the frequency splitting between the two array non-Hermitian supermodes, whereas the imaginary coupling coefficient represents the gain difference between these two supermodes. The imaginary coefficient is derived from the coupling-induced excess output power. We compare three photonic crystal periods and find the largest value arising from the closest separation between two cavities. For the array with the highest imaginary component, the real part is determined which is related to the photon-photon modulation resonance, which has the potential to increase the VCSE digital modulation rate.

Original languageEnglish (US)
Title of host publicationVertical-Cavity Surface-Emitting Lasers XXVI
EditorsChun Lei, Kent D. Choquette, Luke A. Graham
ISBN (Electronic)9781510649118
StatePublished - 2022
EventVertical-Cavity Surface-Emitting Lasers XXVI 2022 - Virtual, Online
Duration: Feb 20 2022Feb 24 2022

Publication series

NameProceedings of SPIE - The International Society for Optical Engineering
ISSN (Print)0277-786X
ISSN (Electronic)1996-756X


ConferenceVertical-Cavity Surface-Emitting Lasers XXVI 2022
CityVirtual, Online


  • VCSEL array
  • coupling
  • coupling coefficient
  • modulation
  • photonic crystal

ASJC Scopus subject areas

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


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