Polarization-independent low-crosstalk operation of InAlGaAs-InAlAs mach-zehnder interferometer-type photonic switch with hybrid waveguide structure

Yuta Ueda, Shinya Nakamura, Shinji Fujimoto, Hiroto Yamada, Katsuyuki Utaka, Takashi Shiota, Takeshi Kitatani

Research output: Contribution to journalArticle

16 Citations (Scopus)


In this letter, we demonstrated a Mach-Zehnder interferometer-type photonic switch using multimode interference (MMI) couplers with InAlGaAs-InAlAs compound semiconductor materials. A hybrid-waveguide structure with different etching depths was adopted for MMI couplers and other parts of the waveguides for polarization-independent operation. As a result, low-crosstalk switching operation of less than -20 dB was confirmed regardless of polarizations of an input light. Switching currents were, respectively, 5.25 and 4.75 mA for TE and TM modes of the input light. High-speed switching operation with about 3-ns transition time was also confirmed.

Original languageEnglish
Pages (from-to)1118-1120
Number of pages3
JournalIEEE Photonics Technology Letters
Issue number16
Publication statusPublished - 2009 Aug 15



  • InAlGaAs-InAlAs compound semiconductor
  • Mach-Zehnder (MZ) interferometer photonic switch
  • Multimode interference (MMI) coupler
  • Polarization independence

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Atomic and Molecular Physics, and Optics
  • Electrical and Electronic Engineering

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