Issued Patents All Time
Showing 1–19 of 19 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 7142785 | Light branching/inserting apparatus and light branching apparatus using wavelength selection filter | Hiroshi Onaka, Terumi Chikama | 2006-11-28 |
| 6930824 | Optical amplifier which compensates for dispersion of a WDM optical signal | George Ishikawa, Hideyuki Miyata, Hiroshi Onaka, Motoyoshi Sekiya | 2005-08-16 |
| 6583900 | Optical transmission apparatus, optical transmission system, and optical terminal station | Hiroshi Onaka, Hideyuki Miyata, Yutaka Kai, Tadao Nakazawa, Terumi Chikama | 2003-06-24 |
| 6538782 | Light branching/inserting apparatus and light branching apparatus using wavelength selection filter | Hiroshi Onaka, Terumi Chikama | 2003-03-25 |
| 6351323 | Optical transmission apparatus, optical transmission system, and optical terminal station | Hiroshi Onaka, Hideyuki Miyata, Yutaka Kai, Tadao Nakazawa, Terumi Chikama | 2002-02-26 |
| 6275314 | Optical wavelength multiplex transmission method and optical dispersion compensation method | George Ishikawa, Hideyuki Miyata, Hiroshi Onaka, Motoyoshi Sekiya | 2001-08-14 |
| 6252687 | Optical wavelength multiplex transmission method and optical dispersion compensation method | George Ishikawa, Hideyuki Miyata, Hiroshi Onaka, Motoyoshi Sekiya | 2001-06-26 |
| 6243176 | Optical wavelength multiplex transmission method and optical dispersion compensation method | George Ishikawa, Hideyuki Miyata, Hiroshi Onaka, Motoyoshi Sekiya | 2001-06-05 |
| 6067187 | Optical amplifier and optical communication system employing the same | Hiroshi Onaka, Hideyuki Miyata | 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, Hideyuki Miyata | 1999-04-13 |
| 5886804 | Optical transmission system employing single mode optical transmission fiber | Hiroshi Onaka, Hideyuki Miyata | 1999-03-23 |
| 5856881 | Optical fiber transmission line | Hiroshi Onaka | 1999-01-05 |
| 5841557 | Method and apparatus for scrambling the polarization of signal lights forming a wavelength division multiplexed signal light | Hiroshi Onaka, Takafumi Terahara, Takao Naito | 1998-11-24 |
| 5790292 | Optical fiber transmission line | Hiroshi Onaka | 1998-08-04 |
| 5696614 | Optical wavelength multiplex transmission method and optical dispersion compensation method | George Ishikawa, Hideyuki Miyata, Hiroshi Onaka, Motoyoshi Sekiya | 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, Hideyuki Miyata, Hiroshi Onaka, Motoyoshi Sekiya | 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, Hiroshi Onaka, Motoyoshi Sekiya | 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, Hiroshi Onaka, Motoyoshi Sekiya | 1997-02-11 |
| 5440207 | Reference light source device using laser | — | 1995-08-08 |