Issued Patents All Time
Showing 76–100 of 113 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 7274878 | Dispersion compensation method in optical communication system having optical add drop multiplexing capability | Kazuo Yamane, Ryosuke Goto, Satoru Okano, Takehito Okeno | 2007-09-25 |
| 7248804 | Optical transmission device using a wide input dynamic range optical amplifier | Taizo Maeda, Takehiro Fujita | 2007-07-24 |
| 7212285 | Optical measurement device | Ryosuke Goto | 2007-05-01 |
| 7208722 | Measuring method and measuring apparatus for coherent crosstalk light | Ryosuke Goto | 2007-04-24 |
| 7133610 | Optical sender, terminal device, and optical communication system each having the optical sender | Yoshitaka Shimura, Keisuke Imai | 2006-11-07 |
| 7039325 | Communication system | Takashi Toyomaki | 2006-05-02 |
| 7031049 | Loss point detecting method and distributed raman amplifier applying the same | Takashi Kamada, Ryosuke Goto | 2006-04-18 |
| 6930824 | Optical amplifier which compensates for dispersion of a WDM optical signal | George Ishikawa, Hideyuki Miyata, Hiroshi Onaka, Kazue Otsuka | 2005-08-16 |
| 6844961 | Method and apparatus for controlling Raman amplification using excitation light pulses of different wavelengths | Kaori Odate, Ryosuke Goto | 2005-01-18 |
| 6839162 | Optical amplifying apparatus and optical communication system | Hiroaki Tomofuji | 2005-01-04 |
| 6654561 | Method and apparatus for measuring optical signal-to-noise ratio, and pre-emphasis method and optical communication system each utilizing the method | Takafumi Terahara, Takeshi Sakamoto, Hiroaki Tomofuji, Makoto Murakami, Kazuo Yamane +1 more | 2003-11-25 |
| 6590686 | Optical transmitter | Tetsuya Kiyonaga, Yoshitaka Shimura | 2003-07-08 |
| 6570703 | Optical amplifying apparatus, optical amplifying method, and optical communication system | Makoto Murakami, Hideto Saito, Hiroaki Tomofuji, Takeshi Sakamoto, Kazuo Yamane | 2003-05-27 |
| 6501774 | Optical transmission apparatus for multiple wavelengths and optical transmission wavelength control method | Hiroshi Kuwahara, Norio Nagase, Setsuo Misaizu, Tetsuya Kiyonaga, Tomoyuki Otsuka | 2002-12-31 |
| 6483625 | WDM optical transmission apparatus | Yoshitaka Shimura, Tetsuya Kiyonaga | 2002-11-19 |
| 6417945 | Optical wavelength multiplex transmission method and optical dispersion compensation method | George Ishikawa, Hideyuki Miyata, Hiroshi Onaka, Kazue Okazaki | 2002-07-09 |
| 6411429 | Optical amplifying apparatus, wide-band optical amplifying apparatus, and optical communication system | Hiroaki Tomofuji, Takeshi Sakamoto, Makoto Murakami, Chihiro Ohshima, Yoshihito Onoda | 2002-06-25 |
| 6384943 | Optical wavelength multiplex transmission method and optical dispersion compensation method | George Ishikawa, Hideyuki Miyata, Hiroshi Onaka, Kazue Okazaki | 2002-05-07 |
| 6334004 | Optical modulator, bias control circuit therefor, and optical transmitter including the optical modulator | Yoshinori Ohkuma | 2001-12-25 |
| 6275314 | Optical wavelength multiplex transmission method and optical dispersion compensation method | George Ishikawa, Hideyuki Miyata, Hiroshi Onaka, Kazue Otsuka | 2001-08-14 |
| 6252687 | Optical wavelength multiplex transmission method and optical dispersion compensation method | George Ishikawa, Hideyuki Miyata, Hiroshi Onaka, Kazue Otsuka | 2001-06-26 |
| 6252688 | Optical wavelength multiplex transmission method and optical dispersion compensation method | George Ishikawa, Hideyuki Miyata, Hiroshi Onaka, Kazue Okazaki | 2001-06-26 |
| 6243176 | Optical wavelength multiplex transmission method and optical dispersion compensation method | George Ishikawa, Hideyuki Miyata, Hiroshi Onaka, Kazue Otsuka | 2001-06-05 |
| 6229833 | Laser diode protecting circuit and laser driving current control circuit | Mitsuharu Noda, Setsuo Misaizu, Tetsuya Kiyonaga, Nobuaki Sato, Yasunori Nagakubo | 2001-05-08 |
| 6097746 | Laser diode protecting circuit | Mitsuharu Noda, Setsuo Misaizu, Tetsuya Kiyonaga | 2000-08-01 |