Issued Patents All Time
Showing 1–21 of 21 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 12224889 | Adaptive equalization filter and method for updating filter coefficients | Etsushi Yamazaki, Seiji Okamoto, Masanori Nakamura, Takeo SASAI, Yoshiaki Kisaka | 2025-02-11 |
| 11799547 | Signal processing apparatus, signal processing method, and program | Masanori Nakamura, Seiji Okamoto, Hideki Nishizawa, Etsushi Yamazaki | 2023-10-24 |
| 11711151 | Optical transmission system and compensation method | Asuka Matsushita, Masanori Nakamura, Shoichiro Kuwahara, Yoshiaki Kisaka | 2023-07-25 |
| 11683093 | Wavelength dispersion compensation apparatus, optical receiving apparatus, wavelength dispersion compensation method and computer program | Masanori Nakamura, Seiji Okamoto, Shuto Yamamoto, Takayuki Kobayashi, Yoshiaki Kisaka +1 more | 2023-06-20 |
| 11575443 | Optical transmission system and output adjustment apparatus | Takashi Mitsui, Toshiaki SHITABA, Akihiro Tanabe, Hisao YOSHINAGA | 2023-02-07 |
| 11463169 | Wavelength dispersion amount estimation apparatus | Masanori Nakamura, Yoshiaki Kisaka, Seiji Okamoto, Fukutaro HAMAOKA | 2022-10-04 |
| 11444699 | Optical transmission system, optical receiving apparatus and optical transmission method | Akira Masuda, Fukutaro HAMAOKA, Shuto Yamamoto, Seiji Okamoto, Masanori Nakamura +2 more | 2022-09-13 |
| 11367997 | Semiconductor integrated optics element and production method therefor | Takahiko Shindo, Naoki Fujiwara, Kimikazu Sano, Hiroyuki Ishii, Hideaki Matsuzaki +1 more | 2022-06-21 |
| 11258512 | Receiving apparatus and receiving method | Seiji Okamoto, Masanori Nakamura | 2022-02-22 |
| 11237334 | Fiber module | Takashi Yamada, Hisao YOSHINAGA, Shunsuke KANAI, Manabu Kubota | 2022-02-01 |
| 10841006 | Signal-to-noise ratio estimation method, optical transmission apparatus, and optical transmission system | Seiji Okamoto, Yoshiaki Kisaka, Mitsuteru YOSHIDA, Masahiro Suzuki | 2020-11-17 |
| 10826620 | Optical receiver, optical reception method, and optical communication system | Fukutaro HAMAOKA, Seiji Okamoto, Masanori Nakamura, Yoshiaki Kisaka | 2020-11-03 |
| 10651944 | Optical transmitter, optical receiver, optical data transmission system, optical transmission method, and optical reception method | Seiji Okamoto, Asuka Matsushita, Mitsuteru YOSHIDA, Fukutaro HAMAOKA, Yoshiaki Yamada +1 more | 2020-05-12 |
| 10422719 | Chromatic dispersion estimating circuit, optical reception device and chromatic dispersion amount estimating method | Etsushi Yamazaki, Tomohiro Takamuku, Yuki Yoshida, Mitsuteru YOSHIDA, Koki Shibahara +1 more | 2019-09-24 |
| 10389452 | Coherent optical reception device | Mitsuteru YOSHIDA, Seiji Okamoto, Eiichi Hosoya, Etsushi Yamazaki, Yasuharu Onuma +3 more | 2019-08-20 |
| 10243664 | Optical modulator driver circuit and optical transmitter | Munehiko Nagatani, Hideyuki Nosaka, Toshihiro Itoh, Koichi Murata, Hiroyuki Fukuyama +15 more | 2019-03-26 |
| 10128818 | Data processor, data processing method and communication device | Yasuharu Onuma, Etsushi Yamazaki, Kazuhito Takei, Osamu Ishida, Mitsuteru YOSHIDA +2 more | 2018-11-13 |
| 10038507 | Optical transmission system, phase compensation method, and optical reception apparatus | Mitsuteru YOSHIDA, Etsushi Yamazaki, Seiji Okamoto, Hiroyuki Uzawa, Koichi Ishihara +6 more | 2018-07-31 |
| 9667350 | Optical receiving device and phase cycle reduction method | Kohki Shibahara, Etsushi Yamazaki, Mitsuteru YOSHIDA, Koichi Ishihara, Takayuki Kobayashi +4 more | 2017-05-30 |
| 9621299 | Coherent communication system, communication method, and transmission method | Koichi Ishihara, Masato Mizoguchi, Tomoki Murakami, Tomoyoshi Kataoka, Yoshiaki Kisaka +5 more | 2017-04-11 |
| 8977141 | Digital signal processing apparatus | Etsushi Yamazaki, Takayuki Kobayashi, Eiji Yoshida, Yutaka Miyamoto | 2015-03-10 |