Issued Patents All Time
Showing 26–50 of 102 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 10219049 | Optical reception apparatus, optical transmission apparatus, optical communication system, and skew adjusting method | Yoshitaka Nomura, Tomofumi Oyama, Yuichi Akiyama, Takeshi Hoshida | 2019-02-26 |
| 10122489 | Polarization state detector, optical transmitter, and optical receiver | — | 2018-11-06 |
| 10090927 | Digital signal processing circuit and signal processing device that includes a plurality of digital signal processing circuits | Yoshitaka Nomura, Tomofumi Oyama, Yi Ge, Yuichi Akiyama, Yoshio Hirose +1 more | 2018-10-02 |
| 10063322 | Optical transmitter and control method of optical transmitter | Yuichi Akiyama | 2018-08-28 |
| 10057012 | Error correction circuit and optical transmission system | Yi Ge, Takeshi Hoshida | 2018-08-21 |
| 9906296 | Network controller and signal quality estimating method | Shoichiro Oda, Yasuhiko Aoki, Takeshi Hoshida, Hiroki Oi | 2018-02-27 |
| 9887798 | Transmission apparatus, reception apparatus and modulation method | Yoshitaka Nomura, Yuichi Akiyama, Takeshi Hoshida | 2018-02-06 |
| 9853739 | Optical transmitter and method for controlling bias of optical modulator | Takeshi Hoshida, Yuichi Akiyama | 2017-12-26 |
| 9787396 | Optical transmission device, transmission system, and transmission method | Kiichi Sugitani, Takahito Tanimura, Yuichi Akiyama | 2017-10-10 |
| 9667347 | Optical transmitter, optical receiver, method of compensating non-linear distortion, and communication apparatus | Tomofumi Oyama, Takeshi Hoshida | 2017-05-30 |
| 9654224 | Optical transmission device, nonlinear distortion compensation method, and nonlinear distortion pre-equalization method | Tomofumi Oyama, Takahito Tanimura, Takeshi Hoshida, Yuichi Akiyama | 2017-05-16 |
| 9654216 | Optical transmitter and waveform distortion correction method | Takahito Tanimura, Yuichi Akiyama | 2017-05-16 |
| 9634764 | Estimating device and method for estimating | Tomofumi Oyama | 2017-04-25 |
| 9559785 | Frequency error estimating apparatus and method, frequency error compensating apparatus, and optical receiver | — | 2017-01-31 |
| 9496966 | Optical communication receiving device and frequency offset compensation method | Kazuhiko Hatae, Nobukazu Koizumi, Koji Nakamuta, Manabu Yamazaki, Tomoki Katou +1 more | 2016-11-15 |
| 9467228 | Optical transmission system and optical transmission method | Takeshi Hoshida, Takahito Tanimura | 2016-10-11 |
| 9444554 | Digital coherent receiving apparatus | Nobukazu Koizumi, Takeshi Hoshida, Takahito Tanimura, Koji Nakamuta, Noriyasu Nakayama | 2016-09-13 |
| 9407471 | Adaptive equalizer tap coefficient correction method and optical receiver | Taku Saito, Nobukazu Koizumi, Osamu Takeuchi, Hirofumi Araki | 2016-08-02 |
| 9374170 | Optical receiving device | Masato Oota, Tomoki Katou, Kazuhiko Hatae, Manabu Yamazaki | 2016-06-21 |
| 9363014 | Non-linear distortion compensator, method of compensating non-linear distortion, and optical receiver | Tomofumi Oyama, Takahito Tanimura | 2016-06-07 |
| 9225459 | Optical transmission system, optical transmission apparatus, signal conditioning program, and signal conditioning method | Shoichiro Oda, Takeshi Hoshida, Takahito Tanimura, Yasuhiko Aoki | 2015-12-29 |
| 9143260 | Optical transmission system, method of adjusting optical transmission device, and non-transitory computer-readable medium | Tomofumi Oyama, Takeshi Hoshida | 2015-09-22 |
| 9094121 | Optical transmission apparatus | Tomofumi Oyama, Takeshi Hoshida | 2015-07-28 |
| 9048957 | Signal processing circuit, optical receiver, detector and method for compensating for waveform distortion | — | 2015-06-02 |
| 9031403 | Optical transmission system and method for monitoring polarization dependent characteristics of optical transmission line | Takeshi Hoshida | 2015-05-12 |