Issued Patents All Time
Showing 1–25 of 75 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 11968033 | Optical transmission device, optical transmission system, and optical transmitting power control method | Tomohiro Yamauchi, Goji Nakagawa | 2024-04-23 |
| 11876559 | Optical transmission system and fiber type determination method | Goji Nakagawa, Hiroki Oi | 2024-01-16 |
| 11683117 | Receiving apparatus and decoding method | Kazumasa Mikami, Junichi Sugiyama | 2023-06-20 |
| 11309968 | Optical transmission device and optical transmission method | Anh Ha Ngo, Naoki AINAKA, Hisao Nakashima | 2022-04-19 |
| 9071379 | Optical branching and insertion device, network management device, and wavelength selective switch | Hiroki Oi | 2015-06-30 |
| 9031418 | Communication system, measuring apparatus, transmitting apparatus, and measurement method | Masahiro Yuki, Norifumi Shukunami | 2015-05-12 |
| 8958695 | Optical adding and dropping device and optical transmission apparatus | Hiroki Ooi, Kentaro Nakamura, Chihiro Ohshima, Tsuyoshi Yamamoto | 2015-02-17 |
| 8295703 | Optical transmission apparatus | Akira Miura, Hiroki Ooi | 2012-10-23 |
| 8131152 | Optical add/drop multiplexer | Yuichi Akiyama, Hiroki Ooi, Jens Rasmussen, Akira Miura, Akihiko Isomura | 2012-03-06 |
| 7936993 | Chromatic dispersion compensating apparatus | Hiroki Ooi, Takashi Iwabuchi, Junichi Kumasako, George Ishikawa, Tomoo Takahara | 2011-05-03 |
| 7933519 | Optical cross-connect using wavelength selective switches | Yuichi Akiyama, Hiroki Ooi | 2011-04-26 |
| 7873283 | Method of monitoring optical signal to noise ratio and optical transmission system using the same | Yuichi Akiyama | 2011-01-18 |
| 7860408 | Interferometer for demodulating differential M-phase shift keying signal | Akihiko Isomura, Jens Rasmussen, Kentaro Nakamura, Takeshi Hoshida, George Ishikawa +7 more | 2010-12-28 |
| 7853148 | Optical add/drop multiplexer | Yuichi Akiyama, Hiroki Ooi, Jens Rasmussen, Akira Miura, Akihiko Isomura | 2010-12-14 |
| 7796887 | Wavelength division multiplexing optical transmission system, and wavelength division multiplexing optical transmission method | Kentaro Nakamura | 2010-09-14 |
| 7792428 | Optical add/drop multiplexer | Yuichi Akiyama, Hiroki Ooi, Jens Rasmussen, Akira Miura, Akihiko Isomura | 2010-09-07 |
| 7751706 | Chromatic dispersion compensating apparatus | Hiroki Ooi, Takashi Iwabuchi, Junichi Kumasako, George Ishikawa, Tomoo Takahara | 2010-07-06 |
| 7720383 | Optical transmission apparatus having OADM function | Yuichi Akiyama, Hiroki Ooi | 2010-05-18 |
| 7711270 | Optical node and optical add/drop multiplexer | Hiroki Ooi, Jens Rasmussen, Akira Miura, Akihiko Isomura, Yuichi Akiyama | 2010-05-04 |
| 7620321 | Optical transmitting apparatus, method of increasing the number of paths of the apparatus, and optical switch module for increasing the number of paths of the apparatus | Akira Miura, Hiroki Ooi, Takeshi Hoshida | 2009-11-17 |
| 7616893 | Wavelength division multiplexing optical repeating transmission method and repeating apparatus | Hiroki Ooi, Takashi Iwabuchi, George Ishikawa | 2009-11-10 |
| 7603007 | Quadrature phase-shift keying modulator and phase shift amount controlling method for the same | Takeshi Hoshida, Kentaro Nakamura, Yuichi Akiyama, Hiroki Ooi, Jens Rasmussen +1 more | 2009-10-13 |
| 7505414 | Network designing device and computer-readable medium | Hisao Nakashima, Takeshi Hoshida, Yuichi Akiyama | 2009-03-17 |
| 7483639 | Method and system for transmitting information in an optical communication system using distributed amplification | Takeshi Hoshida, Hiroshi Onaka | 2009-01-27 |
| 7477446 | Raman amplification system utilizing modulated second-order raman pumping | Rainer Hainberger | 2009-01-13 |