Issued Patents All Time
Showing 1–25 of 42 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 12334979 | Optical wavelength multiplexing transmission device and optical wavelength multiplexing transmission method | Shigeru Ishii, Tatsuya Tsuzuki, Takehiro Fujita | 2025-06-17 |
| 11870553 | Fiber-optic communication apparatus, fiber-optic communication system, and optical power control method | Makoto Hasegawa, Atsushi Kodama, Norifumi Shukunami | 2024-01-09 |
| 11509394 | Controller and control method for Raman amplifier | Norifumi Shukunami | 2022-11-22 |
| 11294258 | Transmission device and transmission system | — | 2022-04-05 |
| 11153014 | Transmitting apparatus and transmitting method | Masamichi Sugamoto, Ryo Murakami, Yuichiro Tanaka, Junichi Sugiyama, Kenichi Miyama | 2021-10-19 |
| 11063684 | Optical transmission system, optical transmission apparatus and transmission method | Ryo KARUBE, Shinichirou Muro, Yoshio Shimano | 2021-07-13 |
| 11018763 | Network system, management device, and management method | Tatsuya Tsuzuki, Shinji Komiya | 2021-05-25 |
| 10972188 | Transmission apparatus and transmission method | Tomoyuki Kato, Shota Mori | 2021-04-06 |
| 10782589 | Wavelength conversion apparatus, optical parametric amplifier, transmission apparatus, and optical transmission system | Ichiro Nakajima, Yoshitaka Yamanaka | 2020-09-22 |
| 10754224 | Wavelength conversion device, transmission device, and transmission system | — | 2020-08-25 |
| 10644823 | Optical transfer system, control device, optical transfer method, and transfer device | Masahiro Yuki, Kazuo Takatsu | 2020-05-05 |
| 10634974 | Wavelength converter, wavelength conversion method, and transmission device | Norifumi Shukunami | 2020-04-28 |
| 9991985 | Optical transmission control device and optical signal wavelength determination method | Tatsuya Tsuzuki | 2018-06-05 |
| 9887778 | Optical amplifier, optical transmission apparatus, and optical repeating apparatus | Yoshito Kachita | 2018-02-06 |
| 9520694 | Optical amplifier with loss adjustment unit based on gain | Yoshito Kachita, Norifumi Shukunami | 2016-12-13 |
| 9509370 | Optical transmission system and optical transmission device | — | 2016-11-29 |
| 9042005 | Raman fiber amplifier and its control via path switching | Shinichirou Muro | 2015-05-26 |
| 9001413 | Control circuit, control method, and transmission system | — | 2015-04-07 |
| 8922876 | Optical amplifying device and optical transmission system | — | 2014-12-30 |
| 8879145 | Raman amplifier | Shingo Hara, Kosuke Komaki, Shota Mori | 2014-11-04 |
| 8854727 | Optical amplifier and transmission system | Kosuke Komaki | 2014-10-07 |
| 8553318 | Optical amplifying device, gain control method, optical transmission device, and gain control device | — | 2013-10-08 |
| 8498045 | Optical amplifier | — | 2013-07-30 |
| 8390923 | Optical amplifier and optical amplification method | — | 2013-03-05 |
| 8379299 | Optical amplifier | Keiko Sasaki, Shinichirou Muro | 2013-02-19 |