Issued Patents All Time
Showing 26–47 of 47 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6137603 | Optical network, optical division and insertion node and recovery system from network failure | — | 2000-10-24 |
| 6125104 | Network node for switching quality detector to incoming signal specified by request message from adjacent node | Tatsuya Shiragaki | 2000-09-26 |
| 6115517 | Optical communication network apparatus and optical switching network | Tatsuya Shiragaki | 2000-09-05 |
| 6081557 | Datalink system and communication network | Yoshihiko Suemura | 2000-06-27 |
| 6061156 | Optical transmission system | Hitoshi Takeshita | 2000-05-09 |
| 5905587 | Optical network device | Yoshiharu Maeno | 1999-05-18 |
| 5887039 | Data transmission system using specific pattern for synchronization | Yoshihiko Suemura, Akio Tajima | 1999-03-23 |
| 5812290 | Optical switching unit and control method for same | Yoshiharu Maeno, Yoshihiko Suemura | 1998-09-22 |
| 5812302 | High-speed frequency modulation signal source and high-speed variable optical wavelength filter | Masatoshi Misono | 1998-09-22 |
| 5757526 | Optical communication network and method for optically detecting a fault | Tatsuya Shiragaki | 1998-05-26 |
| 5687013 | Optical communication system having loop-back function for informing congestion state of receiving node | — | 1997-11-11 |
| 5687181 | Parallel data transmission unit using byte error correcting code | Yoshihiko Suemura | 1997-11-11 |
| 5675429 | Optical communication transmission system | Shogo Nakaya, Tomoki Saito | 1997-10-07 |
| 5675428 | Optical communication apparatus | — | 1997-10-07 |
| 5506920 | Optical wavelength tunable filter | Yoshihiko Suemura, Akio Tajima, Haruo Takahashi, Hiroyuki Morimura | 1996-04-09 |
| 5457559 | Apparatus for extracting an optical clock and apparatus for demultiplexing a time-division multiplexed signal | Tomoki Saito | 1995-10-10 |
| 5392303 | Frequency stabilization method of semiconductor laser, frequency-stabilized light source and laser module | Takahiro Shiozawa, Masayuki Yamaguchi | 1995-02-21 |
| 5325225 | Method of optical transmission and optical transmitter used in the same | Tetsuyuki Suzaki | 1994-06-28 |
| 5227908 | Optical communication apparatus using intensity modulation | — | 1993-07-13 |
| 5184243 | Optical transmitting apparatus for minimal dispersion along an optical fiber | Tetsuyuki Suzaki, Tomoki Saito | 1993-02-02 |
| 4805235 | Optical transmitter comprising an optical frequency discriminator | — | 1989-02-14 |
| 4765738 | Method and apparatus of measuring frequency response in an optical receiving system | — | 1988-08-23 |