Issued Patents All Time
Showing 1–7 of 7 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 8351790 | Optical OADM transmission system with loopback | Yuhiro Midorikawa | 2013-01-08 |
| 7657176 | Method, apparatus, and system for evaluating faulty point in multi-stage optical amplifying and repeating transmission line | Katsuji Yamaguchi | 2010-02-02 |
| 7146071 | Optical transmission system | — | 2006-12-05 |
| 6980745 | Optical transmission system | Hiroyuki Deguchi, Shin-ichirou Harasawa | 2005-12-27 |
| 6424459 | Gain-flattening of an optical amplifier with split-band architecture | — | 2002-07-23 |
| 5875045 | Wavelength-multiplexing optical communication method employing RZ signals, wavelength-multiplexing optical sending apparatus employing RZ signals, and wavelength-multiplexing optical communication system employing RZ signals | Akira Sugiyama | 1999-02-23 |
| 5074631 | Optical modulator | Hiroshi Hamano, Izumi Amemiya, Hiroshi Nishimoto, Takefumi Namiki, Tadashi Okiyama +1 more | 1991-12-24 |