High-speed photonic functional circuits using electrically controllable PLZT waveguides

Jiro Ito, Mitsuhiro Yasumoto, Keiichi Nashimoto, Hiroyuki Tsuda

Research output: Contribution to journalArticle

11 Citations (Scopus)


We fabricated a high-speed wavelength tunable arrayed- waveguide grating (AWG) and an AWG integrated with optical switches using (Pb,La)(Zr,Ti)O 3 (PLZT). PLZT has a high electro-optic (EO) coefficient, which means these devices have considerable potential for use in reconfigurable optical add drop multiplexers (ROADMs). The PLZT waveguides in this work have a rib waveguide structure with an effective relative index difference (A) of 0.65%. Both AWGs have 8 channels with a frequency spacing of 500 GHz. The fabricated wavelength tunable AWGs allows us to freely shift the output at a particular wavelength to an arbitrary port by applying voltages to 3 mm long electrodes formed on each of the waveguides. We confirmed that the maximum tuning range with driving voltage of 22V was approximately 32nm at 1.55 μm. With the integrated 8-ch PLZT waveguide switch array, we could also select the output port by setting the drive voltage applied to the switch array. 2 × 2 directional coupler switches were used for the switch array. The two devices exhibited insertion losses of 17 dB and 19 dB, adjacent crosstalk of -18.5 dB and -19.7 dB, and a maximum extinction ratio of 19.6 dB and 12.6 dB, respectively. The tuning speed of both devices was 15 ns and their physical sizes were 9.0 × 23.0 mm and 8.0 × 29.5 mm, respectively.

Original languageEnglish
Pages (from-to)713-718
Number of pages6
JournalIEICE Transactions on Electronics
Issue number5
Publication statusPublished - 2009 Jan 1



  • Arrayed waveguide grating
  • Electro-optical devices
  • Integrated optics
  • Planar lightwave circuit

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Electrical and Electronic Engineering

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