Issued Patents All Time
Showing 1–25 of 42 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 11245468 | Measurement apparatus of optical communication system | Takehiro Tsuritani, Hidenori Takahashi | 2022-02-08 |
| 7177540 | Method for upgrading an optical transmission system and an optical transmitter | Takanori Inoue, Koji Goto | 2007-02-13 |
| 7088927 | Optical receiving apparatus and method | Koji Goto | 2006-08-08 |
| 6868514 | FEC frame structuring method and FEC multiplexer | Kazuo Kubo, Hideo Yoshida, Hiroshi Ichibangase, Eiichi Shibano, Tadami Yasuda | 2005-03-15 |
| 6856771 | Optical receiving apparatus and method | Koji Goto | 2005-02-15 |
| 6744990 | WDM optical transmission system and an optical transmission line thereof | Masatoshi Suzuki, Noriyuki Takeda, Noboru Edagawa, Hideaki Tanaka, Shinichi Nakagawa +1 more | 2004-06-01 |
| 6584255 | Method for manufacturing optical fiber cable with optical fibers whose chromatic dispersion value are uniformed | Koji Goto | 2003-06-24 |
| 6504638 | Optical amplifying transmission system and optical amplifier | Keiji Tanaka, Noboru Edagawa, Shu Yamamoto | 2003-01-07 |
| 6459518 | Optical transmitting apparatus | Masatoshi Suzuki, Noboru Edagawa, Shu Yamamoto | 2002-10-01 |
| 6445478 | Optical pulse position detecting circuit and an optical pulse generating apparatus and their methods | Katsuhiro Shimizu, Takashi Mizuochi, Takeshi Komiya, Kiwami Matsushita, Tadayoshi Kitayama +4 more | 2002-09-03 |
| 6377375 | Optical wavelength division multiplexed signal amplifying repeater and optical communication transmission line with very large capacity | Shu Yamamoto | 2002-04-23 |
| 6236488 | Optical pulse position detecting circuit and an optical pulse generating apparatus and their methods | Katsuhiro Shimizu, Takashi Mizuochi, Takeshi Komiya, Kiwami Matsushita, Tadayoshi Kitayama +4 more | 2001-05-22 |
| 6181449 | Wavelength division multiplexed optical processing device and optical communication transmission path | Kaoru Imai, Masatoshi Suzuki, Shu Yamamoto, Shigeyuki Akiba | 2001-01-30 |
| 6091538 | Gain equalizing apparatus | Noriyuki Takeda, Shigeyuki Akiba, Noboru Edagawa | 2000-07-18 |
| 6028695 | Optical modulating apparatus | Aritomo Uemura, Takashi Mizuochi, Katsuhiro Shimizu, Kiwami Matsushita, Tadayoshi Kitayama +2 more | 2000-02-22 |
| 6021235 | Wavelength-division multiplexing optical transmission system | Shu Yamamoto, Masatoshi Suzuki, Noboru Edagawa, Shigeyuki Akiba | 2000-02-01 |
| 5978529 | Gain equalizer and optical amplifying transmission line | Noriyuki Takeda, Masatoshi Suzuki, Shu Yamamoto, Shigeyuki Akiba | 1999-11-02 |
| 5966228 | Optical transmission system and optical repeater | Shigeyuki Akiba, Shu Yamamoto, Masatoshi Suzuki, Noboru Edagawa | 1999-10-12 |
| 5937126 | Optically amplifying/repeating transmission system and optical amplifier | Shu Yamamoto, Noboru Edagawa, Shigeyuki Akiba | 1999-08-10 |
| 5926300 | Optical add-drop multiplexer | Takayuki Miyakawa, Shu Yamamoto, Shigeyuki Akiba | 1999-07-20 |
| 5920413 | Method and device for optical add/drop multiplexing using high speed polarization scrambler | Takayuki Miyakawa, Shu Yamamoto, Shigeyuki Akiba | 1999-07-06 |
| 5912750 | Optical transmission line | Noriyuki Takeda, Takayuki Miyakawa, Shigeyuki Akiba, Shu Yamamoto | 1999-06-15 |
| 5892608 | Optical receiver device for dark soliton lightwave | Masatoshi Suzuki, Noboru Edagawa, Shu Yamamoto, Shigeyuki Akiba | 1999-04-06 |
| 5872647 | Optical transmitting terminal | Shu Yamamoto, Noboru Edagawa, Shigeyuki Akiba | 1999-02-16 |
| 5838477 | Optical submarine branching device | Shu Yamamoto, Noboru Edagawa, Tetsuyuki Miyakawa | 1998-11-17 |