Issued Patents All Time
Showing 51–67 of 67 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6275314 | Optical wavelength multiplex transmission method and optical dispersion compensation method | George Ishikawa, Hiroshi Onaka, Motoyoshi Sekiya, Kazue Otsuka | 2001-08-14 |
| 6252687 | Optical wavelength multiplex transmission method and optical dispersion compensation method | George Ishikawa, Hiroshi Onaka, Motoyoshi Sekiya, Kazue Otsuka | 2001-06-26 |
| 6252688 | Optical wavelength multiplex transmission method and optical dispersion compensation method | George Ishikawa, Hiroshi Onaka, Motoyoshi Sekiya, Kazue Okazaki | 2001-06-26 |
| 6243176 | Optical wavelength multiplex transmission method and optical dispersion compensation method | George Ishikawa, Hiroshi Onaka, Motoyoshi Sekiya, Kazue Otsuka | 2001-06-05 |
| 6067187 | Optical amplifier and optical communication system employing the same | Hiroshi Onaka, Kazue Otsuka | 2000-05-23 |
| 5894362 | Optical communication system which determines the spectrum of a wavelength division multiplexed signal and performs various processes in accordance with the determined spectrum | Hiroshi Onaka, Kazue Otsuka | 1999-04-13 |
| 5886804 | Optical transmission system employing single mode optical transmission fiber | Hiroshi Onaka, Kazue Otsuka | 1999-03-23 |
| 5696859 | Optical-filter array, optical transmitter and optical transmission system | Hiroshi Onaka, Nobuhiro Fukushima | 1997-12-09 |
| 5696614 | Optical wavelength multiplex transmission method and optical dispersion compensation method | George Ishikawa, Hiroshi Onaka, Motoyoshi Sekiya, Kazue Otsuka | 1997-12-09 |
| 5636046 | Optical dispersion compensation method using transmissible band determined from synergetic effect of self phase modulation and group velocity dispersion | George Ishikawa, Hiroshi Onaka, Motoyoshi Sekiya, Kazue Otsuka | 1997-06-03 |
| 5612807 | Optical dispersion compensation method for shifting a zero dispersion wavelength of an optical fiber to compensate for dispersion in an optical system | George Ishikawa, Hiroshi Onaka, Motoyoshi Sekiya, Kazue Otsuka | 1997-03-18 |
| 5602666 | Optical dispersion compensation method for shifting a zero dispersion wavelength of an optical fiber to compensate for dispersion in an optical system | George Ishikawa, Hiroshi Onaka, Motoyoshi Sekiya, Kazue Otsuka | 1997-02-11 |
| 5471336 | Cold start control system and method for use in coherent lightwave communications system | Hiroshi Onaka, Takao Naito | 1995-11-28 |
| 5469288 | Optical filter, method of controlling transmission wavelength thereof, and optical receiver using the method | Hiroshi Onaka | 1995-11-21 |
| 5426502 | Optical fiber interference wavelength/frequency detection apparatus which eliminates a movable element | Hiroshi Onaka, Yoshihto Onoda | 1995-06-20 |
| 5200967 | Optical frequency deviation measure and control device for laser light | Hiroshi Onaka | 1993-04-06 |
| 4965858 | Polarization diversity optical receiver for coherent optical communication | Takao Naito, Terumi Chikama, Shigeki Watanabe, Tetsuya Kiyonaga, Yoshihito Onoda +2 more | 1990-10-23 |