A hybrid electro-optic polymer and TiO2 double-slot waveguide modulator

Feng Qiu, Andrew M. Spring, Daisuke Maeda, Masa Aki Ozawa, Keisuke Odoi, Akira Otomo, Isao Aoki, Shiyoshi Yokoyama

Research output: Contribution to journalArticlepeer-review

39 Citations (Scopus)


An electro-optic (EO) modulator using a TiO2 slot hybrid waveguide has been designed and fabricated. Optical mode calculations revealed that the mode was primarily confined within the slots when using a double-slot configuration, thus achieving a high EO activity experimentally. The TiO2 slots also acted as an important barrier to induce an enhanced DC field during the poling of the EO polymer and the driving of the EO modulator. The hybrid phase modulator exhibited a driving voltage (Vπ) of 1.6 V at 1550 nm, which can be further reduced to 0.8 V in a 1 cm-long push-pull Mach-Zehnder interferometer (MZI) structure. The modulator demonstrated a low propagation loss of 5 dB/cm and a relatively high end-fire coupling efficiency.

Original languageEnglish
Article number8561
JournalScientific reports
Publication statusPublished - Feb 24 2015

All Science Journal Classification (ASJC) codes

  • General


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