Integrated optical beam splitters employing symmetric mode mixing in SiO2/SiON/SiO2 multimode interference waveguides

Ricky W. Chuang, Zhen Liang Liao, Chih Kai Chang

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7 Citations (Scopus)


A collection of SiON films with different chemical compositions (various O/N ratios) were deposited on silicon substrates using plasma-enhanced chemical vapor deposition (PECVD). These films were then optically characterized to delineate the impacts of relevant film growth parameters to the corresponding refractive indices and infrared absorption spectra. The refractive indices of SiON films with different O/N ratios spanned from 1.47 to 1.93 were realized by judiciously adjusting the pertinent PECVD gas flow rates. Next, the integrated 1-to-8 and 1-to-16 multimode interference (MMI) power beam splitters were designed and fabricated based on the numerical simulation using beam propagation method (BPM). The normalized light intensities varied from ∼0.92 to 1 and from ∼0.88 to 1 for symmetrical 1 × 8 and 1 × 16 devices, which correspond to the maximum power imbalances of 0.38 and 0.56 dB, respectively. Finally, the ramification of varying the width of multimode waveguide section was also investigated numerically using BPM tecnnique.

Original languageEnglish
Pages (from-to)2440-2444
Number of pages5
JournalJapanese Journal of Applied Physics, Part 1: Regular Papers and Short Notes and Review Papers
Issue number4 B
Publication statusPublished - 2007 Apr 24

All Science Journal Classification (ASJC) codes

  • Engineering(all)
  • Physics and Astronomy(all)

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