Sol-gel-derived 4 × 4 multimode interference coupler: Optimization and fabrication

Oleg V. Mishechkin, Mahmoud Fallahi

Research output: Contribution to journalArticlepeer-review

4 Scopus citations


The design and fabrication of a 4 × 4 multimode interference (MMI) coupler is reported. A photopatternable organic-inorganic sol-gel on silica-on-silicon is adopted for the device fabrication. Optimization of waveguide parameters led to the coupler excess loss below 1 dB and power imbalance below 0.2 dB. An optical 90-deg hybrid based on the coupler is realized and tested. The experimental data are in very good agreement with predicted simulation results, demonstrating the simplicity and exactness of the sol-gel method as an advantageous fabrication route in integrated optics.

Original languageEnglish (US)
Pages (from-to)662-666
Number of pages5
JournalOptical Engineering
Issue number3
StatePublished - Mar 2004


  • Multimode interference coupler
  • Optical 90-deg hybrid
  • Organic-inorganic
  • Sol-gel processing

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics
  • General Engineering


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