Implementation of tapered multimode interference lightwave combiner on silicon-on-insulator substrate with negligible back-reflection

Zhigang Wu, Kazuhiko Nakamura, Soichiro Honda, Katsuyuki Utaka, Tomohiko Edura, Ken Tsutsui, Yasuo Wada

Research output: Contribution to journalArticle

4 Citations (Scopus)


We fabrieated and experimentally evaluated 2 × 1 tapered multimode interference (MMI) combiners on silicon-on-insulator (SOI) substrates. The tapered MMI combiner we previously proposed is expected to be free from the reflection problem usually existed in a conventional rectangular MMI coupler, and such a negligible back-reflection property was actually verified. As one of its applications, we implemented a Mach-Zehnder (MZ) modulator using the tapered MMI combiner, which is often equipped with semiconductor optical amplifiers (SOAs) for ultrahigh-speed photonic switching devices and those SOAs are quite sensitive to the back-reflection.

Original languageEnglish
Pages (from-to)L923-L925
JournalJapanese Journal of Applied Physics, Part 2: Letters
Issue number28-32
Publication statusPublished - 2005 Dec 1



  • Integrated optics
  • Lightwave combiner
  • MMI
  • MZ modulator
  • Si waveguide

ASJC Scopus subject areas

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

Cite this