Issued Patents All Time
Showing 1–25 of 54 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 11870553 | Fiber-optic communication apparatus, fiber-optic communication system, and optical power control method | Makoto Hasegawa, Atsushi Kodama, Tomoaki Takeyama | 2024-01-09 |
| 11855703 | Optical coherent transceiver and filter adjustment method | Shoichi Murakami | 2023-12-26 |
| 11509394 | Controller and control method for Raman amplifier | Tomoaki Takeyama | 2022-11-22 |
| 11171768 | Transmission device, reception device, transmission method, and reception method | — | 2021-11-09 |
| 11018762 | Transmission device, transmission system, and transmission method | Makoto Hasegawa, Jun Okabe | 2021-05-25 |
| 10634974 | Wavelength converter, wavelength conversion method, and transmission device | Tomoaki Takeyama | 2020-04-28 |
| 10608775 | Optical transmission apparatus, optical transmission method, and optical transmission system | Shinji Komiya, Makoto Hasegawa, Tomohiro Yamauchi, Tomoyuki Kato | 2020-03-31 |
| 9742500 | Optical transmission apparatus and optical signal processing method | Yoshito Kachita | 2017-08-22 |
| 9699531 | Switchable optical amplifier and optical transmission apparatus | Yoshito Kachita | 2017-07-04 |
| 9531496 | Optical transmission device and optical transmission method | Masahiro Yuki, Kosuke Komaki | 2016-12-27 |
| 9520694 | Optical amplifier with loss adjustment unit based on gain | Yoshito Kachita, Tomoaki Takeyama | 2016-12-13 |
| 9444572 | Transmission device and transmission method | Tomohiro Kaneoka, Hiroki Oi | 2016-09-13 |
| 9438343 | Transmitting device, communication system, and method for transmission level control | Kosuke Komaki | 2016-09-06 |
| 9300426 | Transmission apparatus, transmission system, and method of controlling average optical input power | Yoshinobu Matsukawa, Kosuke Komaki | 2016-03-29 |
| 9166679 | Optical amplification apparatus, method for controlling same, optical receiver station, and optical transmission system | — | 2015-10-20 |
| 9093816 | Transmission apparatus and transmission system | Tatsuya Tsuzuki | 2015-07-28 |
| 9065570 | Optical amplifier with feedback to obtain set gain and gain tilt | Tatsuya Tsuzuki, Hiroki Ooi | 2015-06-23 |
| 9031418 | Communication system, measuring apparatus, transmitting apparatus, and measurement method | Masahiro Yuki, Takafumi Terahara | 2015-05-12 |
| 8983298 | Optical channel monitor | — | 2015-03-17 |
| 8971700 | Bidirectional monitor module, optical module, optical add-drop multiplexer, and optical system | Takeshi Sakamoto | 2015-03-03 |
| 8947767 | Excitation light source for raman amplification, raman amplifier, and optical transmission system | Shota Mori, Takeshi Hoshida | 2015-02-03 |
| 8861965 | Optical transmission apparatus | Kentaro Nakamura, Tatsuya Tsuzuki | 2014-10-14 |
| 8687982 | OSNR measuring device and optical communication system | Kentaro Nakamura | 2014-04-01 |
| 8655170 | OSNR monitor device and OSNR measurement device | Kentaro Nakamura, Noriaki Mizuguchi | 2014-02-18 |
| 8547629 | Gain and signal level adjustments of cascaded optical amplifiers | Shinya Inagaki, Susumu Kinoshita, Hiroyuki Itou, Taiki Kobayashi | 2013-10-01 |