Issued Patents All Time
Showing 1–9 of 9 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6930823 | Optical transmission method and optical transmission system utilizing Raman amplification | Hiroshi Nakamoto, Takao Naito, Toshiki Tanaka | 2005-08-16 |
| 6882466 | Optical amplifier | Takao Naito | 2005-04-19 |
| 6807376 | Gain equalizer which includes a plurality of optical filters for equalizing the gain of an optical amplifier | Takafumi Terahara, Terumi Chikama | 2004-10-19 |
| 6606188 | Optical repeater using raman amplification, wavelength division multiplexed light transmission system, excitation light supply method and excitation light control method for raman amplification | — | 2003-08-12 |
| 6480328 | Optical amplifier and optical amplification method for amplifying wavelength division multiplexed signal light | — | 2002-11-12 |
| 6417960 | Method of equalizing gain utilizing asymmetrical loss-wavelength characteristics and optical amplifying apparatus using same | — | 2002-07-09 |
| 6344914 | Gain equalizer which includes a plurality of optical filters for equalizing the gain of an optical amplifier | Takafumi Terahara, Terumi Chikama | 2002-02-05 |
| 6268955 | Optical amplifier and wave length division multiplexed light transmission system | Takao Naito | 2001-07-31 |
| 6061172 | Active optical fiber and optical fiber amplifier | Takao Naito, Takafumi Terahara | 2000-05-09 |