Issued Patents All Time
Showing 1–5 of 5 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 11165501 | Excitation light source apparatus and optical transmission system | Katsunori Imanishi, Toshiyuki Tokura, Kengo Takata | 2021-11-02 |
| 11128380 | Signal light interruption detection device, optical amplifier, optical wavelength multiplex transmission device, and optical wavelength multiplex transmission system | Kanehiro Matsumoto, Toshiyuki Tokura, Kengo Takata | 2021-09-21 |
| 10708676 | Optical transmission line switching apparatus, optical transmission system, and transmission line switching method | Katsunori Imanishi, Toshiyuki Tokura, Kengo Takata | 2020-07-07 |
| 9628173 | Optical transmission line switching apparatus and optical transmission system | Toshiyuki Tokura | 2017-04-18 |
| 9077286 | Optical amplifier that controls level of optical output signal | — | 2015-07-07 |