Issued Patents All Time
Showing 1–14 of 14 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| RE44881 | Optical amplifier and an optical amplification method | Hideaki Sugiya | 2014-05-06 |
| 7236294 | Optical amplifier | Tomoaki Takeyama, Shinya Inagaki, Takashi Shimizu, Keiko Sasaki | 2007-06-26 |
| 6738184 | Optical amplifier for amplifying multi-wavelength light | Etsuko Hayashi, Yasushi Sugaya, Keiko Sasaki | 2004-05-18 |
| 6411429 | Optical amplifying apparatus, wide-band optical amplifying apparatus, and optical communication system | Hiroaki Tomofuji, Motoyoshi Sekiya, Takeshi Sakamoto, Makoto Murakami, Chihiro Ohshima | 2002-06-25 |
| 6373624 | Optical amplifier and an optical amplification method | Hideaki Sugiya | 2002-04-16 |
| 6304371 | Optical amplifier and an optical amplification method | Hideaki Sugiya | 2001-10-16 |
| 6118576 | Optical amplifier and an optical amplification method | Hideaki Sugiya | 2000-09-12 |
| 6111688 | Optical amplifier and system including the same | Taiki Kobayashi, Tadashi Okiyama | 2000-08-29 |
| 5875054 | Bidirectional optical amplifier circuit | Terumi Chikama | 1999-02-23 |
| 5822112 | Control apparatus for optical amplifier | Hiroyuki Itou, Michikazu Shima, Yuji Tamura | 1998-10-13 |
| 5115332 | Receiver for coherent optical communication | Takao Naito, Terumi Chikama, Shigeki Watanabe, Tetsuya Kiyonaga, Hideo Kuwahara | 1992-05-19 |
| 5052051 | Heterodyne receiver for coherent optical communication | Takao Naito, Terumi Chikama, Shigeki Watanabe, Tetsuya Kiyonaga | 1991-09-24 |
| 5050176 | Direct modulation phase-shift-keying system and method | Takao Naito, Terumi Chikama, Shigeki Watanabe, Tetsuya Kiyonaga, Hiroshi Onaka | 1991-09-17 |
| 4965858 | Polarization diversity optical receiver for coherent optical communication | Takao Naito, Terumi Chikama, Shigeki Watanabe, Tetsuya Kiyonaga, Hideo Kuwahara +2 more | 1990-10-23 |