Issued Patents All Time
Showing 51–75 of 83 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 7079311 | Optical amplifier and optical communication system including the same | Masakazu Shigehara | 2006-07-18 |
| 7064890 | Optical amplifier and optical communication system including the same | — | 2006-06-20 |
| 7027215 | Optical component, optical amplification module, and optical transmission system | Hitoshi Hatayama, Tatsuhiko Shitomi, Masayuki Shigematsu | 2006-04-11 |
| 6958856 | Raman amplifier, raman amplifier control method, and optical communication system | Masayuki Inoue | 2005-10-25 |
| 6954305 | Optical amplifier and optical transmission system using it | — | 2005-10-11 |
| 6867907 | Pumping light source unit, raman amplifier, and optical transmission system | Masayuki Inoue, Masakazu Shigehara | 2005-03-15 |
| 6865019 | Amplification optical fiber and fiber optic amplifier including the same | Soichi Endo, Kazuhiro Okamoto, Masahiro Takagi | 2005-03-08 |
| 6819482 | Optical amplifier and optical communication system including the same | Masakazu Shigehara | 2004-11-16 |
| 6813065 | Raman amplifier and optical communication system | Tetsufumi Tsuzaki, Shinji Ishikawa, Masashi Onishi | 2004-11-02 |
| 6806999 | Raman amplification pumping module, Raman amplifier, and optical communication system | Tetsufumi Tsuzaki, Masayuki Nishimura | 2004-10-19 |
| 6804046 | Optical amplification fiber, fiber optic amplifier, and optical communication system | Masahiro Takagi | 2004-10-12 |
| 6791744 | Raman amplification optical fiber, optical fiber coil, raman amplifier, and optical communication system | Eisuke Sasaoka, Masashi Onishi, Toshiki Tanaka, Takao Naito | 2004-09-14 |
| 6778322 | Four-wave mixing suppression in Raman amplifiers | Masaaki Hirano | 2004-08-17 |
| 6771415 | Optical fiber for optical amplifier and fiber optic amplifier | Shinji Endo, Shinji Ishikawa | 2004-08-03 |
| 6724527 | Optical amplifier and optical transmission system using same | Shinji Endo | 2004-04-20 |
| 6687433 | WDM optical communication system | Toshiaki Okuno | 2004-02-03 |
| 6687439 | Light-amplifying optical fiber and method of making the same | Shinji Endo, Shinji Ishikawa, Toshimi Suzuki | 2004-02-03 |
| 6577440 | Optical fiber for optical amplifier and fiber optic amplifier | Shinji Endo, Shinji Ishikawa | 2003-06-10 |
| 6549315 | Optical transmission system and optical amplifying apparatus, optical amplifying unit, and optical coupler for the same | — | 2003-04-15 |
| 6538806 | Optical fiber for optical amplifier and fiber optic amplifier | Shinji Endo, Shinji Ishikawa | 2003-03-25 |
| 6538807 | Amplification optical fiber, fiber optic amplifier, optical transmitter, and optical communication system | Masahiro Takagi | 2003-03-25 |
| 6490078 | Optical fiber for optical amplifier, optical fiber amplifier and optical fiber laser | Tadashi Enomoto, Masahiro Takagi, Yuichi Ohga, Shinji Ishikawa, Masakazu Shigehara +1 more | 2002-12-03 |
| 6456428 | Optical amplifier | Haruo Nakaji | 2002-09-24 |
| 6453103 | Optical communication system | Toshiaki Okuno | 2002-09-17 |
| 6327412 | Optical fiber, light-emitting module, and optical fiber amplifier | Shinji Ishikawa, Takashi Sasaki | 2001-12-04 |