Issued Patents All Time
Showing 1–14 of 14 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 7433594 | Node apparatus, optical wavelength division multiplexing network, and system switching method | Katsumi Iwatsuki, Hitoshi Obara | 2008-10-07 |
| 7206510 | Ring network using multi-wavelength generator | Hiroo Suzuki, Masamichi Fujiwara, Mitsuhiro Teshima, Koji Akimoto, Shingo Kawai +2 more | 2007-04-17 |
| 7164861 | Node apparatus, optical wavelength division multiplexing network, and system switching method | Katsumi Iwatsuki, Hitoshi Obara | 2007-01-16 |
| 7127168 | Multi-wavelength optical modulation circuit and wavelength-division multiplexed optical signal transmitter | Jun-ichi Kani, Katsuhiro Araya, Koji Akimoto, Mitsuhiro Teshima, Masamichi Fujiwara +3 more | 2006-10-24 |
| 7106970 | Polarization scrambler and optical network using the same | Masamichi Fujiwara, Mitsuhiro Teshima, Katsumi Iwatsuki | 2006-09-12 |
| 7031614 | Polarization scrambler and optical network using the same | Masamichi Fujiwara, Mitsuhiro Teshima, Katsumi Iwatsuki | 2006-04-18 |
| 6959152 | Polarization scrambler and optical network using the same | Masamichi Fujiwara, Mitsuhiro Teshima, Katsumi Iwatsuki | 2005-10-25 |
| 6744546 | Multilevel light-intensity modulating circuit | Takuya Nakamura, Jun-ichi Kani, Mitsuhiro Teshima | 2004-06-01 |
| 6678087 | Optical amplifier and optical fiber communication system using the amplifier | Hiroji Masuda | 2004-01-13 |
| 6583924 | Optical amplifier | Hiroji Masuda, Junichi KANI | 2003-06-24 |
| 6545780 | Wavelength allocation method, a transmission equipment and receiving equipment using this method and a wavelength division multiplex transmission system | Masafumi Koga, Shoko Ohteru | 2003-04-08 |
| 6469826 | Optical amplifier | Hiroji Masuda, Junichi KANI | 2002-10-22 |
| 6359724 | Light generation method and light source | Yoshitada Katagiri, Shinji Nagaoka, Fumikazu Ohira, Ken Suzuki, Masamichi Fujiwara | 2002-03-19 |
| 5937117 | Optical cross-connect system | Osamu Ishida, Kenichi Sato | 1999-08-10 |