Issued Patents All Time
Showing 1–10 of 10 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 8588609 | Wavelength division multiplexing transmission system and apparatus and optical signal noise ratio calculation method | — | 2013-11-19 |
| 8564876 | Raman amplifier and raman amplifier adjustment method | Yoshio Shimano, Masao Nakata | 2013-10-22 |
| 8339698 | Raman amplifier and raman amplifier adjustment method | Yoshio Shimano, Masao Nakata | 2012-12-25 |
| 8213078 | Raman amplifier and raman amplifier adjustment method | — | 2012-07-03 |
| 7554721 | Raman amplifier and Raman amplifier adjustment method | Yoshio Shimano, Masao Nakata | 2009-06-30 |
| 7123404 | Optical amplifier and optical amplification method | Shota Mori | 2006-10-17 |
| 7058298 | Optical transmission device and optical transmission system | Hideaki Koyano, Masato Kobayashi, Kazumaro Takaiwa, Akio Takayasu | 2006-06-06 |
| 5939920 | Method and apparatus which adds distortion to a signal to compensate for distortion added at a later stage by a nonlinear element | — | 1999-08-17 |
| 5793411 | Video-on-demand system | — | 1998-08-11 |
| 5550977 | Multi-media mailing method and apparatus | — | 1996-08-27 |