Issued Patents All Time
Showing 26–44 of 44 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 10211923 | Optical network system, optical node device, and optical path setting method | Tomoyuki Hino, Shinsuke Fujisawa, Akio Tajima | 2019-02-19 |
| 10193651 | Optical network controller and optical network control method | Shinsuke Fujisawa, Ryuichi Ikematsu, Akio Tajima, Tomoyuki Hino | 2019-01-29 |
| 9979468 | Optical communication system, optical node device, and optical path setting method | Shinsuke Fujisawa, Tomoyuki Hino, Akio Tajima | 2018-05-22 |
| 9609401 | Optical switch, optical transmission device, and optical switching method | Ryuichi Ikematsu, Akio Tajima | 2017-03-28 |
| 9590725 | Multi-failure resolution optical node, optical communication system using same, and wavelength path switching method | — | 2017-03-07 |
| 8639114 | DPSK modulation-demodulation method, and optical communication device and optical communication system using the same | Satomi Shioiri, Toshiharu Itou, Kiyoshi Fukuchi | 2014-01-28 |
| 8405511 | Optical signal quality monitoring | — | 2013-03-26 |
| 8175455 | Optical transmission system and optical transmission control method | Toshiharu Ito | 2012-05-08 |
| 8165477 | Light receiving apparatus using DQPSK demodulation method, and DQPSK demodulation method | Satomi Shioiri, Kiyoshi Fukuchi, Toshiharu Ito | 2012-04-24 |
| 7340187 | Optical signal monitoring method and apparatus | — | 2008-03-04 |
| 7280756 | Optical signal transmission system, optical signal transmitter, optical signal receiver, method of transmitting optical signal and method of receiving optical signal | — | 2007-10-09 |
| 7280470 | Ring network for sharing protection resource by working communication paths | Tatsuya Shiragaki, Naoya Henmi, Makoto Nishio, Hirofumi Shimomura | 2007-10-09 |
| 6895183 | Optical add-drop multiplexer | Hirofumi Shimomura, Naoya Henmi | 2005-05-17 |
| 6771907 | Optical ring system | Yuuki Yoshifuji, Shuichi Iida, Takashi Yamazaki, Youko Nakabayashi, Shinya Nakamura +9 more | 2004-08-03 |
| 6657952 | Ring network for sharing protection resource by working communication paths | Tatsuya Shiragaki, Naoya Henmi, Makoto Nishio, Hirofumi Shimomura | 2003-12-02 |
| 6538779 | Optical signal monitoring method and apparatus | Hirofumi Shimomura, Tatsuya Shiragaki, Naoya Henmi | 2003-03-25 |
| 6407834 | Optical wave network system and method of monitoring a network trouble | Naoya Henmi | 2002-06-18 |
| 6404525 | Optical add-drop multiplexer | Hirofumi Shimomura, Naoya Henmi | 2002-06-11 |
| 6061156 | Optical transmission system | Naoya Henmi | 2000-05-09 |