Issued Patents All Time
Showing 1–20 of 20 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 11063684 | Optical transmission system, optical transmission apparatus and transmission method | Ryo KARUBE, Tomoaki Takeyama, Yoshio Shimano | 2021-07-13 |
| 9042005 | Raman fiber amplifier and its control via path switching | Tomoaki Takeyama | 2015-05-26 |
| 8379299 | Optical amplifier | Tomoaki Takeyama, Keiko Sasaki | 2013-02-19 |
| 8174758 | Optical amplifier | Yuji Tamura | 2012-05-08 |
| 8116626 | Optical transmission apparatus and optical attenuation amount control method | Tomoaki Takeyama, Ichiro Nakajima, Keiko Sasaki, Etsuko Hayashi | 2012-02-14 |
| 8077383 | Optical amplifier | Tomoaki Takeyama, Keiko Sasaki | 2011-12-13 |
| 8026538 | Photo-detecting apparatus and photo-detecting method | Tomoaki Takeyama, Keiko Sasaki | 2011-09-27 |
| 8027082 | Raman amplifier and excitation light source used thereof | Tomoaki Takeyama | 2011-09-27 |
| 7990608 | Optical transmission system | Tomoaki Takeyama, Keiko Sasaki | 2011-08-02 |
| 7813642 | Optical transmission apparatus and method of controlling the same | Hideaki Sugiya, Yasushi Sugaya, Etsuko Hayashi | 2010-10-12 |
| 7643206 | Optical amplifier | Tomoaki Takeyama, Keiko Sasaki | 2010-01-05 |
| 7616848 | Optical transmission apparatus | Tomoaki Takeyama, Keiko Sasaki, Etsuko Hayashi | 2009-11-10 |
| 7551347 | Optical amplification characteristics simulation apparatus and optical amplification characteristics simulation method | Etsuko Hayashi, Shunsuke Ono, Setsuhisa Tanabe, Masato Nishihara | 2009-06-23 |
| 7505197 | Optical amplifier provided with control function of pumping light, and optical transmission system using the same | Yasushi Sugaya, Etsuko Hayashi, Masato Nishihara | 2009-03-17 |
| 7400441 | Optical amplifier, optical amplification repeater and pump light supply control method | Yasushi Sugaya, Etsuko Hayashi | 2008-07-15 |
| 7359112 | Individual band gain equalizer for optical amplifiers | Masato Nishihara, Miki Onaka, Etsuko Hayashi | 2008-04-15 |
| 7180654 | Raman amplifier | Yasushi Sugaya, Etsuko Hayashi | 2007-02-20 |
| 7145718 | Control method of optical fiber amplifier and optical transmission system | Yasushi Sugaya, Etsuko Hayashi | 2006-12-05 |
| 6999177 | Method and apparatus for measuring multi-path interference noise in optical amplifier | Yasushi Sugaya | 2006-02-14 |
| 6823107 | Method and device for optical amplification | Etsuko Hayashi, Yasushi Sugaya | 2004-11-23 |