Issued Patents All Time
Showing 1–19 of 19 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 8208812 | Optical relay device and optical relay transmission system | Toshiyuki Tokura, Katsuhiro Shimizu, Kazuyuki Ishida | 2012-06-26 |
| 7598479 | Circuit for varying gain of preamplifier | Masamichi Nogami, Masaki Noda, Hitoyuki Tagami | 2009-10-06 |
| 7218441 | Non-polarization light source device and raman amplifier | Toshiyuki Tokura, Taichi Kogure, Takashi Sugihara | 2007-05-15 |
| 7218861 | Optical transceiver, a multiplexing integrated circuit, a demultiplexing integrated circuit, an integral multiplexing/demultiplexing integrated circuit, and method for evaluating and testing the optical transceiver | Hirofumi Totsuka, Kazuo Kubo | 2007-05-15 |
| 7170673 | Optical amplifying repeater apparatus and optical amplifying/repeating transmission system | Katsuhiro Shimizu, Junichi Nakagawa, Naoki Suzuki | 2007-01-30 |
| 6989717 | Circuit and method for switching gains of preamplifier | Masamichi Nogami | 2006-01-24 |
| 6873456 | Optical amplifying repeater apparatus and optical amplifying/repeating transmission system | Katsuhiro Shimizu, Junichi Nakagawa, Naoki Suzuki | 2005-03-29 |
| 6674328 | Amplifier circuit | Ken-ichi Uto | 2004-01-06 |
| 6657778 | Optical amplification repeater and optical amplification repeating and transmitting system | Katsuhiro Shimizu, Junichi Nakagawa, Naoki Suzuki | 2003-12-02 |
| 6249160 | Clock reproduction and identification apparatus | Hitoyuki Tagami | 2001-06-19 |
| 6215368 | Voltage controlled oscillating device | Hitoyuki Tagami | 2001-04-10 |
| 5978124 | Light emitting control apparatus and optical transmitter | Eiji Maekawa, Susumu Satoh, Tadayoshi Kitayama | 1999-11-02 |
| 5821814 | Negative feedback amplifier | Masatoshi Katayama, Masamichi Nogami | 1998-10-13 |
| 5760949 | Light amplifier | Takashi Mizuochi, Katsumi Takano, Tadayoshi Kitayama | 1998-06-02 |
| 5710660 | Gain-controllable optical amplifier and optical gain-control method | Shu Yamamoto, Hidenori Taga, Noboru Edagawa, Shigeyuki Akiba, Katsumi Takano +1 more | 1998-01-20 |
| 5510930 | Light amplifying apparatus | Tadayoshi Kitayama, Junichiro Yamashita, Eiichi Nakagawa, Shigeyuki Akiba, Masatoshi Suzuki +3 more | 1996-04-23 |
| 5506724 | Gain controllable optical amplifier and applications thereof | Katsuhiro Shimizu, Takashi Mizuochi, Tadayoshi Kitayama | 1996-04-09 |
| 5107362 | Optical transmission apparatus | Miyuki Shuji, Tadayoshi Kitayama, Tomohiko Nambara | 1992-04-21 |
| 4940306 | Star network optical transmission system | Tadayoshi Kitayama, Kiwami Matsushita | 1990-07-10 |