Issued Patents All Time
Showing 26–50 of 82 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5790289 | WDM optical communication method with pre-emphasis technique and an apparatus therefor | Hidenori Taga, Noriyuki Takeda, Shu Yamamoto | 1998-08-04 |
| 5790294 | Line monitoring method and line monitoring apparatus | Yukio Horiuchi, Shu Yamamoto | 1998-08-04 |
| 5786918 | Optical communication system and optical transmitting device | Masatoshi Suzuki, Hidenori Taga, Noboru Edagawa, Hideaki Tanaka, Shu Yamamoto | 1998-07-28 |
| 5771255 | Laser light generator | Yukio Horiuchi, Shu Yamamoto | 1998-06-23 |
| 5737110 | Optical communication system using dark soliton lightwave | Masatoshi Suzuki, Noboru Edagawa, Hidenori Taga, Shu Yamamoto | 1998-04-07 |
| 5710660 | Gain-controllable optical amplifier and optical gain-control method | Shu Yamamoto, Hidenori Taga, Noboru Edagawa, Kuniaki Motoshima, Katsumi Takano +1 more | 1998-01-20 |
| 5642215 | Optical transmission system | Masatoshi Suzuki, Itsuro Morita, Noboru Edagawa, Hidenori Taga, Shu Yamamoto | 1997-06-24 |
| 5629795 | Optical amplifying-repeating transmission system | Masatoshi Suzuki, Itsuro Morita, Shu Yamamoto, Noboru Edagawa, Hidenori Taga | 1997-05-13 |
| 5625479 | Soliton optical communication system and optical transmitter and optical receiver therefor | Masatoshi Suzuki, Noboru Edagawa, Hidenori Taga, Shu Yamamoto | 1997-04-29 |
| 5589969 | Wavelength division multiplexed optical fiber transmission equipment | Hidenori Taga, Noboru Edagawa, Noriyuki Takeda, Shu Yamamoto | 1996-12-31 |
| 5585954 | Apparatus for measuring optical transmission characteristic | Hidenori Taga, Shu Yamamoto | 1996-12-17 |
| 5574590 | Optical amplifying transmitting system | Noboru Edagawa, Masatoshi Suzuki, Hidenori Taga, Itsuro Morita, Shu Yamamoto | 1996-11-12 |
| 5559910 | Wavelength division multiplexed optical fiber transmission equiptment | Hidenori Taga, Noboru Edagawa, Shu Yamamoto, Noriyuki Takeda | 1996-09-24 |
| 5539557 | Supervisory signal receiving method and apparatus | Yukio Horiuchi, Hiroharu Wakabayashi, Shu Yamamoto | 1996-07-23 |
| 5510930 | Light amplifying apparatus | Kuniaki Motoshima, Tadayoshi Kitayama, Junichiro Yamashita, Eiichi Nakagawa, Masatoshi Suzuki +3 more | 1996-04-23 |
| 5430795 | Optical transmitter with the signal light of reduced degree of polarization and optical depolarizing circuit | Hidenori Taga, Noboru Edagawa, Shu Yamamoto, Hiroharu Wakabayashi | 1995-07-04 |
| 5132747 | Avalanche photo diode | Yuichi Matsushima, Kazuo Sakai | 1992-07-21 |
| 5122844 | Quantum well structure and semiconductor device using the same | Masashi Usami, Yuichi Matsushima, Kazuo Sakai, Katsuyuki Utaka | 1992-06-16 |
| 5019519 | Method for the manufacture of optical semiconductor device | Hideaki Tanaka, Masatoshi Suzuki, Katsuyuki Utaka | 1991-05-28 |
| 4991921 | Pn junction optical modulating device having a buffer layer with small energy gap | Masatoshi Suzuki, Hideaki Tanaka, Yuichi Matsushima | 1991-02-12 |
| 4946243 | Optical modulation element | Masatoshi Suzuki, Hideaki Tanaka, Katsuyuki Utaka | 1990-08-07 |
| 4932034 | Distributed feedback semiconductor laser device and current injection | Masashi Usami, Yuichi Matsushima | 1990-06-05 |
| 4918496 | Infrared emitting device with dislocation free layer | Yuichi Matsushima, Kazuo Sakai, Katsuyuki Utaka | 1990-04-17 |
| 4913506 | Optical modulation device | Masatoshi Suzuki, Hideaki Tanaka, Katsuyuki Utaka | 1990-04-03 |
| 4897845 | Semiconductor optical amplifying element | Katsuyuki Utaka, Yuichi Matsushima, Kazuo Sakai | 1990-01-30 |