Issued Patents All Time
Showing 1–12 of 12 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 12199741 | Optical transmission system, optical transmission device, and optical transmission method | Akihiro Mukai, David Dal Farra | 2025-01-14 |
| 11990988 | Optical transmission system and optical transmission device | Naoki AINAKA, Tomohiro Yamauchi | 2024-05-21 |
| 11909515 | Optical transmission system and receiving device | Tomoaki Watanabe, Atsushi Kiyama, Makoto Hasegawa | 2024-02-20 |
| 11228375 | Transmission system, transmission device, and transmission method | Takashi Sato | 2022-01-18 |
| 9887778 | Optical amplifier, optical transmission apparatus, and optical repeating apparatus | Tomoaki Takeyama | 2018-02-06 |
| 9813183 | Optical transmission device and optical transmission system | Kentaro Nakamura, Satoru Okano, Yusaku Yamamoto | 2017-11-07 |
| 9742500 | Optical transmission apparatus and optical signal processing method | Norifumi Shukunami | 2017-08-22 |
| 9699531 | Switchable optical amplifier and optical transmission apparatus | Norifumi Shukunami | 2017-07-04 |
| 9520694 | Optical amplifier with loss adjustment unit based on gain | Tomoaki Takeyama, Norifumi Shukunami | 2016-12-13 |
| 9391421 | Optical amplification apparatus, optical transmission apparatus, and optical transmission system | Satoru Okano | 2016-07-12 |
| 8599693 | Packet transmission device and packet transmission method | Tsutomu Noguchi, Katsumi Imamura, Hideyo Fukunaga, Yoko Ohta, Naoya Matsusue | 2013-12-03 |
| 8068730 | Wavelength division multiplex signal monitoring system and wavelength division multiplex transmission device equipped with the same | Ichiro Nakajima, Yasushi Sugaya, Ryosuke Goto | 2011-11-29 |