A straightforward electro-optic polymer covered titanium dioxide strip line modulator with a low driving voltage

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

doi:10.1063/1.4893925

A straightforward electro-optic polymer covered titanium dioxide strip line modulator with a low driving voltage

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

Department of Advanced Device Materials

Research output: Contribution to journal › Article › peer-review

18 Citations (Scopus)

Abstract

An electro-optic (EO) modulator composed of an EO polymer/titanium dioxide (TiO₂) hybrid waveguide has been designed and fabricated. By using a TiO₂ strip line (0.3×0.3μm² cross-section) as the core, the confinement factor in the EO polymer is optimized, thus achieving a high EO activity. The coplanar electrode spacing is tuned to enable an effective poling and a small propagation loss. The measured in-device EO coefficient is 100pm/V at 1550nm, with a driving voltage (V_π) 3.2V for the 12mm-electrode length. The results also predict a possible V_π of ∼1V in a push-pull MZI structure. The EO activity of the modulator exhibited an excellent temporal stability at 85°C for 500 h due to the high glass transition temperature of the EO polymer and the temperature-insensitive TiO₂ strip line.

Original language	English
Article number	073305
Journal	Applied Physics Letters
Volume	105
Issue number	7
DOIs	https://doi.org/10.1063/1.4893925
Publication status	Published - Aug 18 2014

All Science Journal Classification (ASJC) codes

Physics and Astronomy (miscellaneous)

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10.1063/1.4893925

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title = "A straightforward electro-optic polymer covered titanium dioxide strip line modulator with a low driving voltage",

abstract = "An electro-optic (EO) modulator composed of an EO polymer/titanium dioxide (TiO2) hybrid waveguide has been designed and fabricated. By using a TiO2 strip line (0.3×0.3μm2 cross-section) as the core, the confinement factor in the EO polymer is optimized, thus achieving a high EO activity. The coplanar electrode spacing is tuned to enable an effective poling and a small propagation loss. The measured in-device EO coefficient is 100pm/V at 1550nm, with a driving voltage (Vπ) 3.2V for the 12mm-electrode length. The results also predict a possible Vπ of ∼1V in a push-pull MZI structure. The EO activity of the modulator exhibited an excellent temporal stability at 85°C for 500 h due to the high glass transition temperature of the EO polymer and the temperature-insensitive TiO2 strip line.",

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AU - Qiu, Feng

AU - Spring, Andrew M.

AU - Maeda, Daisuke

AU - Ozawa, Masa Aki

AU - Odoi, Keisuke

AU - Aoki, Isao

AU - Otomo, Akira

AU - Yokoyama, Shiyoshi

PY - 2014/8/18

Y1 - 2014/8/18

N2 - An electro-optic (EO) modulator composed of an EO polymer/titanium dioxide (TiO2) hybrid waveguide has been designed and fabricated. By using a TiO2 strip line (0.3×0.3μm2 cross-section) as the core, the confinement factor in the EO polymer is optimized, thus achieving a high EO activity. The coplanar electrode spacing is tuned to enable an effective poling and a small propagation loss. The measured in-device EO coefficient is 100pm/V at 1550nm, with a driving voltage (Vπ) 3.2V for the 12mm-electrode length. The results also predict a possible Vπ of ∼1V in a push-pull MZI structure. The EO activity of the modulator exhibited an excellent temporal stability at 85°C for 500 h due to the high glass transition temperature of the EO polymer and the temperature-insensitive TiO2 strip line.

AB - An electro-optic (EO) modulator composed of an EO polymer/titanium dioxide (TiO2) hybrid waveguide has been designed and fabricated. By using a TiO2 strip line (0.3×0.3μm2 cross-section) as the core, the confinement factor in the EO polymer is optimized, thus achieving a high EO activity. The coplanar electrode spacing is tuned to enable an effective poling and a small propagation loss. The measured in-device EO coefficient is 100pm/V at 1550nm, with a driving voltage (Vπ) 3.2V for the 12mm-electrode length. The results also predict a possible Vπ of ∼1V in a push-pull MZI structure. The EO activity of the modulator exhibited an excellent temporal stability at 85°C for 500 h due to the high glass transition temperature of the EO polymer and the temperature-insensitive TiO2 strip line.

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A straightforward electro-optic polymer covered titanium dioxide strip line modulator with a low driving voltage

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All Science Journal Classification (ASJC) codes

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