Issued Patents All Time
Showing 26–31 of 31 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 7515829 | Wavelength division multiplexing optical transmission system | — | 2009-04-07 |
| 7209661 | Wavelength multiplexing method and an apparatus thereof | Futoshi Izumi | 2007-04-24 |
| 7123404 | Optical amplifier and optical amplification method | Maki Hiraizumi | 2006-10-17 |
| 6864968 | Method of measuring wavelength dispersion amount and optical transmission system | Futoshi Izumi | 2005-03-08 |
| 6674567 | Raman excitation control method and optical transmission system using the same | Toshihiro Ohtani, Futoshi Izumi, Tsukasa Takahashi, Hideki Kobayashi | 2004-01-06 |
| 6532102 | Optical amplifier | Hideki Kobayashi, Tsukasa Takahashi, Toshihiro Ohtani, Futoshi Izumi | 2003-03-11 |