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Tanaka D.,Keio University | Ikuma Y.,Keio University | Tsuda H.,Keio University | Kawashima H.,Network Photonics Research Center | And 2 more authors.
2012 International Conference on Photonics in Switching, PS 2012 | Year: 2012

We reported an ultracompact 2×2 directional coupling optical switch with Si waveguides and phase-change material. Switching operation was successfully demonstrated by 3-D FDTD method. The loss of 0.5 dB and the crosstalk of -20.5 dB were achieved for the cross-state. The loss of 3.0 dB and the crosstalk of -7.8 dB were achieved for the bar-state. © 2012 SEE.


Ikuma Y.,Keio University | Saiki T.,Keio University | Tsuda H.,Keio University | Kawashima H.,Network Photonics Research Center | Kintaka K.,Network Photonics Research Center
Proceedings of 2011 1st International Symposium on Access Spaces, ISAS 2011 | Year: 2011

We investigated the feasibility of a 2x2 optical switch that uses a phase-change material and directional coupler made of silicon waveguides. The tolerances for fabrication errors and for the optical properties of the phase change material were reported. © 2011 IEEE.


Cong G.W.,Network Photonics Research Center | Matsukawa T.,Japan National Institute of Advanced Industrial Science and Technology | Chiba T.,Japan National Institute of Advanced Industrial Science and Technology | Tadokoro H.,Japan National Institute of Advanced Industrial Science and Technology | And 8 more authors.
2014 13th International Conference on Optical Communications and Networks, ICOCN 2014 | Year: 2014

This invited talk will review our work on the monolithic integration of the MOSFET and the thermo-optic (TO) based Mach-Zehnder switch (MZS) using the front-end process on the photonic SOI platform. This MOSFET was capable of driving the TO phase shifter because of its large current capability. By tuning the gate voltage of the MOSFET, the switching state of MZS was successfully controlled. We will also present our work on the robust switch design with the intention to minimize the negative influences on switching performance due to so many MOSFET process steps. For this purpose, we had proposed a new 3dB directional coupler which was more robust to the gap variation than the conventional one. Our monolithic MOSFET is promising in simplifying the driver circuits and in developing on-chip drivers for TO-based silicon photonics devices. © 2014 IEEE.

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