Research Theme and Highlight 2016


    • Optical Sensing Device

    • This research is about gas sensing using waveguide, its purpose is to realize compact breath sensing system in the future. We already successfully measured Carbon dioxide (CO2) concentration by using a 4.5cm length silica high-mesa waveguide in 2016. To realize ppm order gas concentration measurement, we are now working on the design of low loss waveguide and high sensitivity sensing system
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      • Active MMI Laser

      • In future, extreme high transmission capacity technology is needed. In order to realize such technology based on spatial division multiplexing technology, our laboratory have been researching mode selective active-Multimode Interferometer Laser diode. In 2016, we successfully demonstrated mode selective light source, which has selective output mode between fundamental mode and first order mode. Currently, we are researching on realizing selecting lateral lasing modes higher than 2nd order mode as well as extremely high speed direct modulation laser more than 50 GHz.
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        • Optical Mode Switch

        • We proposed new optical mode switch device. Such proposal has 1 order higher integration level as well as lower power consumption compared to the previous one. We have confirmed the dynamic optical switch based on current injection, and at least 60 ns of mode switching speed has been confirmed. Currently, we are considering new optical mode switch that can work on more than 4 modes with higher speed.
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          • Ge Waveguide

          • Germanium (Ge) is the material that is compatible with Silicon (Si) and can be used for integrated active or passive optical waveguide. Our laboratory is currently researching on waveguide based on Ge material. In 2016, we have confirmed that Ge optical waveguide can be manipulated by CHF3 gas.
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