Issued Patents All Time
Showing 51–75 of 84 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6275314 | Optical wavelength multiplex transmission method and optical dispersion compensation method | George Ishikawa, Hideyuki Miyata, Motoyoshi Sekiya, Kazue Otsuka | 2001-08-14 |
| 6266180 | Optical fiber amplifier using optical fiber having a portion which suppresses nonlinear optical phenomena | Shinya Inagaki, Keiko Takeda, Kaoru Moriya | 2001-07-24 |
| 6252687 | Optical wavelength multiplex transmission method and optical dispersion compensation method | George Ishikawa, Hideyuki Miyata, Motoyoshi Sekiya, Kazue Otsuka | 2001-06-26 |
| 6252688 | Optical wavelength multiplex transmission method and optical dispersion compensation method | George Ishikawa, Hideyuki Miyata, Motoyoshi Sekiya, Kazue Okazaki | 2001-06-26 |
| 6243176 | Optical wavelength multiplex transmission method and optical dispersion compensation method | George Ishikawa, Hideyuki Miyata, Motoyoshi Sekiya, Kazue Otsuka | 2001-06-05 |
| 6178037 | Optical amplifying apparatus | Yasushi Sugaya, Susumu Kinoshita, Terumi Chikama | 2001-01-23 |
| 6151158 | Method and device for optical amplification and system having the device | Miki Takeda, Susumu Kinoshita | 2000-11-21 |
| 6067187 | Optical amplifier and optical communication system employing the same | Hideyuki Miyata, Kazue Otsuka | 2000-05-23 |
| 6018411 | Optical device utilizing magneto-optical effect | Nobuhiro Fukushima | 2000-01-25 |
| 5973821 | Variable optical attenuator which applies a magnetic field to a faraday element to rotate the polarization of light signal | Nobuhiro Fukushima | 1999-10-26 |
| 5894362 | Optical communication system which determines the spectrum of a wavelength division multiplexed signal and performs various processes in accordance with the determined spectrum | Kazue Otsuka, Hideyuki Miyata | 1999-04-13 |
| 5886804 | Optical transmission system employing single mode optical transmission fiber | Hideyuki Miyata, Kazue Otsuka | 1999-03-23 |
| 5867300 | Variable optical attenuator which applies a magnetic field to a faraday element to rotate the polarization of a light signal | Nobuhiro Fukushima | 1999-02-02 |
| 5856881 | Optical fiber transmission line | Kazue Otsuka | 1999-01-05 |
| 5841557 | Method and apparatus for scrambling the polarization of signal lights forming a wavelength division multiplexed signal light | Kazue Otsuka, Takafumi Terahara, Takao Naito | 1998-11-24 |
| 5790292 | Optical fiber transmission line | Kazue Otsuka | 1998-08-04 |
| 5737118 | Optical amplifying apparatus | Yasushi Sugaya, Susumu Kinoshita, Terumi Chikama | 1998-04-07 |
| 5696859 | Optical-filter array, optical transmitter and optical transmission system | Hideyuki Miyata, Nobuhiro Fukushima | 1997-12-09 |
| 5696614 | Optical wavelength multiplex transmission method and optical dispersion compensation method | George Ishikawa, Hideyuki Miyata, Motoyoshi Sekiya, Kazue Otsuka | 1997-12-09 |
| 5646399 | Tunable optical filter having beam splitter and movable film filter | Nobuhiro Fukushima | 1997-07-08 |
| 5636046 | Optical dispersion compensation method using transmissible band determined from synergetic effect of self phase modulation and group velocity dispersion | George Ishikawa, Hideyuki Miyata, 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, Hideyuki Miyata, 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, Hideyuki Miyata, Motoyoshi Sekiya, Kazue Otsuka | 1997-02-11 |
| 5596448 | Dispersion compensator and optical amplifier | Motoyoshi Sekiya | 1997-01-21 |
| 5568305 | Heterodyne receiver provided with a frequency discriminator for coherent lightwave communications | Takao Naito, Terumi Chikama | 1996-10-22 |