Issued Patents All Time
Showing 26–49 of 49 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6603596 | Gain and signal level adjustments of cascaded optical amplifiers | Norifumi Shukunami, Susumu Kinoshita, Hiroyuki Itou, Taiki Kobayashi | 2003-08-05 |
| 6266180 | Optical fiber amplifier using optical fiber having a portion which suppresses nonlinear optical phenomena | Keiko Takeda, Kaoru Moriya, Hiroshi Onaka | 2001-07-24 |
| 6163398 | Dispersion compensating fiber and optical amplifier using same | Keiko Takeda | 2000-12-19 |
| 6134046 | Optical amplifying fiber and forming method for fiber grating | Norifumi Shukunami, Miki Takeda | 2000-10-17 |
| 6061173 | Wavelength-division-multiplexing optical amplifier | Kazuo Yamane, Michikazu Shima, Yumiko Kawasaki, Kenji Tagawa, Norifumi Shukunami | 2000-05-09 |
| 6043930 | Optical amplifier and optical fiber applicable to optical amplifier | — | 2000-03-28 |
| 6014248 | Wavelength division multiplexed optical signal amplifier | Taiki Kobayashi, Tadashi Okiyama | 2000-01-11 |
| 5970198 | Optically amplifying fiber and optical fiber amplifier | Norifumi Shukunami, Keiko Takeda, Koji Okamura | 1999-10-19 |
| 5861973 | Optical amplifier for collectively amplifying optical signals having a plurality of multiplexed wavelengths | Norifumi Shukunami | 1999-01-19 |
| 5799125 | Rare earth doped optical fiber | Takeshi Sumiya | 1998-08-25 |
| 5778129 | Doped optical fiber having core and clad structure for increasing the amplification band of an optical amplifier using the optical fiber | Norifumi Shukunami | 1998-07-07 |
| 5764404 | Wavelength-division-multiplexing optical amplifier | Kazuo Yamane, Michikazu Shima, Yumiko Kawasaki, Kenji Tagawa, Norifumi Shukunami | 1998-06-09 |
| 5745283 | Method and apparatus for controlling optical amplifier used for optically amplifying wavelength-division multiplexed signal | Kenji Tagawa, Norifumi Shukunami, Nobuhiro Fukushima | 1998-04-28 |
| 5467218 | Optical fiber amplifier | Keiko Takeda, Kenji Tagawa, Kazuya Sasaki | 1995-11-14 |
| 5327282 | Optical amplifier for 1.3 .mu.m band | Keiko Takeda, Kenji Tagawa | 1994-07-05 |
| 5276549 | Optical transmitter including rare earth-doped fiber | Kenji Tagawa, Keiko Takeda, Osamu Oyama | 1994-01-04 |
| 5189483 | Apparatus for measurement of chromatic dispersion in a single mode optical fiber | — | 1993-02-23 |
| 5155621 | Optical fiber amplifier | Keiko Takeda, Kenji Tagawa, Osamu Oyama | 1992-10-13 |
| 5140598 | Fiber optic amplifier | Kenji Tagawa, Keiko Takeda | 1992-08-18 |
| 5136420 | Optical fiber amplifier | Masayoshi Shigihara, Sakae Yoshizawa, Kazuya Sasaki, Keiko Takeda | 1992-08-04 |
| 5087110 | Optical fiber cable and manufacture of optical fiber cable | Sakae Yoshizawa, Kazuya Sasaki | 1992-02-11 |
| 5077815 | Apparatus for optically connecting a single-mode optical fiber to a multi-mode optical fiber | Sakae Yoshizawa, Akihiko Ichikawa, Etsugo Yoneda, Kazuya Sasaki, Keiko Takeda | 1991-12-31 |
| 5071212 | Optical fiber polarizer and process of production thereof | Akitoshi Mesaki, Norio Suzuki, Tadao Arima, Kouji Okamura | 1991-12-10 |
| 5007698 | Optical fiber amplifier/multiplexer | Kazuya Sasaki, Sakae Yoshizawa, Keiko Takeda | 1991-04-16 |