Issued Patents All Time
Showing 26–50 of 66 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 8139285 | Raman amplifying device and control method | Kiyotoshi Noheji, Togo Fukushi, Masanori Kondoh | 2012-03-20 |
| 8054538 | Raman amplification apparatus and distributed raman amplification system as well as starting up method for distributed raman amplification system | Kiyotoshi Noheji, Masanori Kondoh, Togo Fukushi | 2011-11-08 |
| 8049955 | Optical amplification apparatus, optical communication apparatus, and optical communication method | Yasushi Sugaya, Togo Fukushi, Masanori Kondoh, Kiyotoshi Noheji, Takashi Hayasaka | 2011-11-01 |
| 8050574 | Optical receiving apparatus and optical level adjusted quantity setting method therefor | — | 2011-11-01 |
| 8004751 | Wavelength division multiplexing optical transmission system utilizing distributed raman amplification | Kiyotoshi Noheji, Togo Fukushi, Masanori Kondoh | 2011-08-23 |
| 7933063 | Monitoring method and apparatus of noise light due to Raman amplification and optical communication system using the same | — | 2011-04-26 |
| 7843631 | Gain control apparatus, optical transmission apparatus, gain control method for optical amplifier, and wavelength multiplex optical transmission system | Hideaki Sugiya, Yasushi Sugaya, Etsuko Hayashi | 2010-11-30 |
| 7751119 | Optical surge suppressive type optical amplifier | Etsuko Hayashi | 2010-07-06 |
| 7725032 | Optical transmission apparatus | Yasushi Sugaya, Hiroki Ooi | 2010-05-25 |
| 7715093 | Individual band gain equalizer for optical amplifiers | Masato Nishihara, Etsuko Hayashi | 2010-05-11 |
| 7688498 | Optical amplifier and optical monitor circuit | Etsuko Hayashi, Hiroshi Onaka | 2010-03-30 |
| 7650072 | Method of upgrading optical node, and an optical node apparatus | Yasushi Sugaya, Takahumi Terahara, Satoru Okano, Takehiro Fujita, Hiroaki Tomofuji +1 more | 2010-01-19 |
| 7599110 | Raman pump power control for gain flattening | Susumu Kinoshita | 2009-10-06 |
| 7529022 | Raman amplifier and wavelength division multiplexing optical communication system, and method of controlling raman amplification | Yasushi Sugaya, Etsuko Hayashi | 2009-05-05 |
| 7522839 | Method of upgrading optical node, and an optical node apparatus | Yasushi Sugaya, Takahumi Terahara, Satoru Okano, Takehiro Fujita, Hiroaki Tomofuji +1 more | 2009-04-21 |
| 7453628 | Optical amplifier having wide dynamic range | Yasushi Sugaya | 2008-11-18 |
| 7446934 | Raman, pump power control for gain flattening | Susumu Kinoshita | 2008-11-04 |
| 7417791 | Optical amplifier for amplifying multi-wavelength light | Yasushi Sugaya, Etsuko Hayashi, Norifumi Shukunami, Manabu Watanabe | 2008-08-26 |
| 7394589 | Optical amplifier for wide band Raman amplification of wavelength division multiplexed (WDM) signal lights | Tomoto Tanaka, Etsuko Hayashi, Yasushi Sugaya, Susumu Kinoshita | 2008-07-01 |
| 7362499 | Optical amplifier with pump light source control for Raman amplification | Etsuko Hayashi, Tomoto Tanaka, Yasushi Sugaya | 2008-04-22 |
| 7359112 | Individual band gain equalizer for optical amplifiers | Masato Nishihara, Etsuko Hayashi, Shinichirou Muro | 2008-04-15 |
| 7268936 | Optical amplifier having polarization mode dispersion compensation function | Etsuko Hayashi, Yasushi Sugaya | 2007-09-11 |
| 7127139 | Optical multiplexing method and optical multiplexer, and optical amplifier using same | Etsuko Hayashi, Hiroshi Onaka | 2006-10-24 |
| 7110166 | Raman pump power control for gain flattening | Susumu Kinoshita | 2006-09-19 |
| 7061669 | Optical apparatus with loss compensation capability and optical amplifier for loss compensation | Hisao Nakashima, Masato Nishihara, Etsuko Hayashi, Hideyuki Miyata | 2006-06-13 |