Issued Patents 2003
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6654561 | Method and apparatus for measuring optical signal-to-noise ratio, and pre-emphasis method and optical communication system each utilizing the method | Takafumi Terahara, Takeshi Sakamoto, Hiroaki Tomofuji, Motoyoshi Sekiya, Makoto Murakami +1 more | 2003-11-25 |
| 6570691 | Optical transmission system using in-line amplifiers | Akira Miyauchi, Yumiko Kawasaki, Satoru Okano | 2003-05-27 |
| 6570703 | Optical amplifying apparatus, optical amplifying method, and optical communication system | Makoto Murakami, Motoyoshi Sekiya, Hideto Saito, Hiroaki Tomofuji, Takeshi Sakamoto | 2003-05-27 |