Issued Patents All Time
Showing 26–50 of 75 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 7321736 | Optical receiving station, optical communication system, and dispersion controlling method | Yuichi Akiyama, Hiroki Ooi | 2008-01-22 |
| 7218856 | System for compensating for chromatic dispersion and polarization mode dispersion | Tomoo Takahara, Jens Rasmussen, Hiroki Ooi | 2007-05-15 |
| 7035548 | Polarization-mode dispersion detecting method, and a dispersion compensation controlling apparatus and a dispersion compensation controlling method | Hiroki Ooi, Yuichi Akiyama | 2006-04-25 |
| 7030973 | Polarization mode dispersion compensator based on degree of polarization | Jens Rasmussen, Takafumi Terahara, Hiroki Ooi | 2006-04-18 |
| 7006770 | Optical receiving station, optical communication system, and dispersion controlling method | Yuichi Akiyama, Hiroki Ooi | 2006-02-28 |
| 6930824 | Optical amplifier which compensates for dispersion of a WDM optical signal | Hideyuki Miyata, Hiroshi Onaka, Motoyoshi Sekiya, Kazue Otsuka | 2005-08-16 |
| 6925262 | Method and system for compensating chromatic dispersion | Hiroki Ooi | 2005-08-02 |
| 6909851 | Dispersion compensation apparatus including a fixed dispersion compensator for coarse compensation and a variable dispersion compensator for fine compensation | — | 2005-06-21 |
| 6865305 | Adaptively controllable polarization mode dispersion compensator | Jens Rasmussen | 2005-03-08 |
| 6829440 | Method and apparatus for compensation of polarization-mode dispersion | Hiroki Ooi | 2004-12-07 |
| 6809849 | Control apparatus and control method for an optical method | Yuichi Akiyama | 2004-10-26 |
| 6728491 | Polarization-mode dispersion detecting method, and a dispersion compensation controlling apparatus and a dispersion compensation controlling method | Hiroki Ooi, Yuichi Akiyama | 2004-04-27 |
| 6661974 | Optical transmitter and optical transmission system | Yuichi Akiyama, Hiroki Ooi, Terumi Chikama | 2003-12-09 |
| 6606424 | Apparatus and method for optical modulation and demodulation | Hiroki Ooi, Minoru Seino | 2003-08-12 |
| 6573985 | Wavelength dispersion measuring device and a method thereof | Sadao Ibukuro | 2003-06-03 |
| 6501580 | Method and apparatus for optimizing dispersion in an optical fiber transmission line in accordance with an optical signal power level | Hiroki Ooi, Naoki Kuwata | 2002-12-31 |
| 6456411 | Method of setting signal wavelength in optical transmission system | Hiroki Ooi | 2002-09-24 |
| 6417945 | Optical wavelength multiplex transmission method and optical dispersion compensation method | Hideyuki Miyata, Hiroshi Onaka, Motoyoshi Sekiya, Kazue Okazaki | 2002-07-09 |
| 6411416 | Method and apparatus for minimizing the intensity of a specific frequency component of an optical signal travelling through an optical fiber transmission line to thereby minimize the total dispersion | Hiroki Ooi | 2002-06-25 |
| 6384943 | Optical wavelength multiplex transmission method and optical dispersion compensation method | Hideyuki Miyata, Hiroshi Onaka, Motoyoshi Sekiya, Kazue Okazaki | 2002-05-07 |
| 6362913 | Optical modulation apparatus and method of controlling optical modulator | Hiroki Ooi, Hiroshi Nakamoto, Takuji Yamamoto, Yoshinori Nishizawa | 2002-03-26 |
| 6320687 | Dispersion compensation apparatus including a fixed dispersion compensator for coarse compensation and a variable dispersion compensator for fine compensation | — | 2001-11-20 |
| 6278539 | Optical modulation apparatus and method of controlling | Hiroki Ooi, Hiroshi Nakamoto, Takuji Yamamoto, Yoshinori Nishizawa | 2001-08-21 |
| 6275314 | Optical wavelength multiplex transmission method and optical dispersion compensation method | Hideyuki Miyata, Hiroshi Onaka, Motoyoshi Sekiya, Kazue Otsuka | 2001-08-14 |
| 6262828 | Method and apparatus of driving an optical modulator to measure, and compensate for, dispersion in an optical transmission line | Yuichi Akiyama, Hiroki Ooi, Shigeki Watanabe | 2001-07-17 |