Issued Patents All Time
Showing 1–23 of 23 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6115156 | Demultiplexer device for wavelength-division multiplexed optical fiber communication | Tomohiro Otani, Toshio Kawazawa, Koji Goto | 2000-09-05 |
| 5539557 | Supervisory signal receiving method and apparatus | Yukio Horiuchi, Shigeyuki Akiba, Shu Yamamoto | 1996-07-23 |
| 5471333 | Optical communication system | Hidenori Taga, Masatoshi Suzuki, Noboru Edagawa, Shu Yamamoto | 1995-11-28 |
| 5430795 | Optical transmitter with the signal light of reduced degree of polarization and optical depolarizing circuit | Hidenori Taga, Noboru Edagawa, Shu Yamamoto, Shigeyuki Akiba | 1995-07-04 |
| 5406368 | Method and apparatus for chromatic dispersion measurements | Yukio Horiuchi, Yoshinori Namihira | 1995-04-11 |
| 5162936 | Apparatus for monitoring the operation of an optical repeater | Hidenori Taga, Shu Yamamoto, Noboru Edagawa | 1992-11-10 |
| 5140452 | Long-distance high-speed optical communication scheme | Shu Yamamoto, Hidenori Taga, Noboru Edagawa, Yoshihiro Yoshida, Shiro Ryu | 1992-08-18 |
| 5138621 | Pumping light source drive system for an optical amplifier | Koji Goto, Shu Yamamoto, Yukio Horiuchi | 1992-08-11 |
| 5042039 | Er-doped optical fiber laser device | Noboru Edagawa, Kiyofumi Mochizuki | 1991-08-20 |
| 4933990 | Optical privacy communication system in two-way optical transmission system | Kiyofumi Mochizuki, Yoshinao Iwamoto | 1990-06-12 |
| 4720162 | Device for switching from one light source to another | Kiyofumi Mochizuki, Yoshihori Namihira, Hideharu Tokiwa | 1988-01-19 |
| 4710976 | Optical repeater monitoring system | Yasuhiko Niiro | 1987-12-01 |
| 4411520 | Light dispersion measuring apparatus | Kiyofumi Mochizuki, Yasuhiko Niiro | 1983-10-25 |
| 4408831 | Optical switch | Haruo Sakaguchi, Norio Seki, Shu Yamamoto | 1983-10-11 |
| 4320968 | Fault location system in an optical fiber transmission system | Hideharu Tokiwa | 1982-03-23 |
| 4313224 | Monitoring system of an optical power in an optical repeater | Yasuhiko Niiro | 1982-01-26 |
| 4304489 | System for measuring an optical loss in a single mode optical fiber | Yasuhiko Niiro | 1981-12-08 |
| 4300239 | Optical repeater monitoring system | Yasuhiko Niiro | 1981-11-10 |
| 4278850 | Monitoring system for optical transmission line repeaters | Masanori Sato, Yasuhiko Niiro | 1981-07-14 |
| 4270029 | Selection system for digital signal repeaters | Masanori Sato, Yoshihiro Ejiri, Hitoshi Yamamoto | 1981-05-26 |
| 4257675 | Optical-fiber submarine cable and manufacturing method thereof | Yukio Nakagome, Yasuhiko Niiro, Makoto Nunokawa | 1981-03-24 |
| 4211920 | Fault location system for optical repeating paths | — | 1980-07-08 |
| 4201959 | Automatic equalization system | Yasuhiko Niiro | 1980-05-06 |