Issued Patents All Time
Showing 1–25 of 38 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 10044463 | Optical transceiving apparatus, optical transmitting method, and optical transmitting device | Noriaki Mizuguchi | 2018-08-07 |
| 9537570 | Optical transceiving apparatus, optical transmitting method, and optical transmitting device | Noriaki Mizuguchi | 2017-01-03 |
| 9124382 | Transmission device, transmission system, and method for adjusting passband | Kenichi Kaburagi | 2015-09-01 |
| 7756416 | Optical communication node and optical network system | Takuji Maeda, Yuji Shimada | 2010-07-13 |
| 7650072 | Method of upgrading optical node, and an optical node apparatus | Miki Onaka, Yasushi Sugaya, Takahumi Terahara, Satoru Okano, Takehiro Fujita +1 more | 2010-01-19 |
| 7522839 | Method of upgrading optical node, and an optical node apparatus | Miki Onaka, Yasushi Sugaya, Takahumi Terahara, Satoru Okano, Takehiro Fujita +1 more | 2009-04-21 |
| 7509055 | Optical transmission system with automatic signal level adjustment and startup functions | Takuji Maeda, Taizo Maeda, Hideki Kobayashi, Tatsuo Nagayoshi, Tetsuo Wada | 2009-03-24 |
| 7466478 | Optical-level control method, optical-level control apparatus and wavelength-multiplexing optical network | Takuji Maeda, Haruki Tanaka, Hisayuki Ojima, Hideaki Sugiya, Koji Batou | 2008-12-16 |
| 7433600 | Optical node device and system including the device | Toru Katagiri, Hiroshi Onaka | 2008-10-07 |
| 7394951 | Optical signal level control apparatus | Takuji Maeda, Yuji Shimada | 2008-07-01 |
| 7343102 | Optical transmission system with automatic signal level adjustment and startup functions | Takuji Maeda, Taizo Maeda, Hideki Kobayashi, Tatsuo Nagayoshi, Tetsuo Wada | 2008-03-11 |
| 7286758 | Method for switching transmission route, and optical transmission device | Yuji Shimada, Takuji Maeda, Takeshi Sakamoto, Ichiro Nakajima | 2007-10-23 |
| 7254334 | Multiplex optical communication system | — | 2007-08-07 |
| 7200333 | Optical communication apparatus, system, and method that properly compensate for chromatic dispersion | Toru Katagiri, Hiroshi Onaka | 2007-04-03 |
| 7088922 | Wavelength division multiplexing optical communication system | Hiroshi Onaka, Terumi Chikama | 2006-08-08 |
| 7062173 | Optical device and wavelength division multiplexing communication system using same | Toru Katagiri | 2006-06-13 |
| 6987903 | Optical transmission network, optical transmission apparatus, dispersion compensator arrangement calculation apparatus and dispersion compensator arrangement calculation method | Ichiro Nakajima, Takeshi Sakamoto, Yuji Shimada | 2006-01-17 |
| 6903324 | Optical amplifier amplifying wavelength multiplexed light, and wavelength multiplexed light communications system | Takuji Maeda, Norifumi Shukunami, Tatsuya Tsuzuki, Yuichi Suzuki | 2005-06-07 |
| 6850581 | Timing circuit | Hiroshi Hamano | 2005-02-01 |
| 6839162 | Optical amplifying apparatus and optical communication system | Motoyoshi Sekiya | 2005-01-04 |
| 6662317 | Method and apparatus for chromatic dispersion equalization | — | 2003-12-09 |
| 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, Motoyoshi Sekiya, Makoto Murakami, Kazuo Yamane +1 more | 2003-11-25 |
| 6639716 | Wavelength division multiplexing optical communication system and optical amplifying device | — | 2003-10-28 |
| 6600584 | Multiplex optical communication system | — | 2003-07-29 |
| 6570703 | Optical amplifying apparatus, optical amplifying method, and optical communication system | Makoto Murakami, Motoyoshi Sekiya, Hideto Saito, Takeshi Sakamoto, Kazuo Yamane | 2003-05-27 |