Issued Patents All Time
Showing 1–23 of 23 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 8867927 | Optical transmitting apparatus, optical receiving apparatus, and optical communication system comprising them | Yuichi Akiyama, Takeshi Hoshida, Akira Miura, Yutaka Kai, Hiroki Ooi +5 more | 2014-10-21 |
| 8244138 | Polarization-multiplexing optical transmitter polarization-multiplexing optical receiver, polarization-multiplexing optical transceiving system, and controlling method thereof | Takeshi Hoshida | 2012-08-14 |
| 8131152 | Optical add/drop multiplexer | Yuichi Akiyama, Takafumi Terahara, Hiroki Ooi, Akira Miura, Akihiko Isomura | 2012-03-06 |
| 7970290 | Digital phase estimator, digital phase locked loop and optical coherent receiver | Zhenning Tao, Lei Li | 2011-06-28 |
| 7953328 | Optical DQPSK transmitter phase monitor and control | Zhenning Tao | 2011-05-31 |
| 7933522 | Optical signal transmission system and optical signal transmission method | Akihiko Isomura | 2011-04-26 |
| 7877025 | Phase monitor apparatus, phase control apparatus and methods thereof for optical DQPSK receiver | Zhenning Tao, Akihiko Isomura | 2011-01-25 |
| 7860408 | Interferometer for demodulating differential M-phase shift keying signal | Akihiko Isomura, Takafumi Terahara, Kentaro Nakamura, Takeshi Hoshida, George Ishikawa +7 more | 2010-12-28 |
| 7853148 | Optical add/drop multiplexer | Yuichi Akiyama, Takafumi Terahara, Hiroki Ooi, Akira Miura, Akihiko Isomura | 2010-12-14 |
| 7848659 | Optical transmitting apparatus and optical communication system | Akira Miura, Kentaro Nakamura, Hiroshi Onaka, Yuichi Akiyama, Hiroki Ooi +1 more | 2010-12-07 |
| 7792428 | Optical add/drop multiplexer | Yuichi Akiyama, Takafumi Terahara, Hiroki Ooi, Akira Miura, Akihiko Isomura | 2010-09-07 |
| 7711270 | Optical node and optical add/drop multiplexer | Hiroki Ooi, Takafumi Terahara, Akira Miura, Akihiko Isomura, Yuichi Akiyama | 2010-05-04 |
| 7689074 | Optical reception apparatus compatible with DQPSK polarization multiplexing format | Akihiko Isomura | 2010-03-30 |
| 7684713 | Phase control apparatus and optical DQPSK receiver | Yoshikazu Terayama, Noriaki Mizuguchi, Eiji Ishikawa, Takashi Toyomaki, Kenichi Kaburagi +2 more | 2010-03-23 |
| 7676162 | Phase monitor used in optical receiver | Akihiko Isomura, Zhenning Tao, Noriaki Mizuguchi, Kenichi Kaburagi | 2010-03-09 |
| 7616900 | Optical signal degradation compensator | Akihiko Isomura, George Ishikawa | 2009-11-10 |
| 7613366 | Polarization mode dispersion compensator and polarization mode dispersion compensating method | Akihiko Isomura, George Ishikawa | 2009-11-03 |
| 7603007 | Quadrature phase-shift keying modulator and phase shift amount controlling method for the same | Takafumi Terahara, Takeshi Hoshida, Kentaro Nakamura, Yuichi Akiyama, Hiroki Ooi +1 more | 2009-10-13 |
| 7535616 | Polarization controlling apparatus and polarization operation apparatus | Kazuo Hironishi, Nobuhiro Fukushima | 2009-05-19 |
| 7277608 | Optical transmitter | Akihiko Isomura | 2007-10-02 |
| 7218856 | System for compensating for chromatic dispersion and polarization mode dispersion | Tomoo Takahara, Hiroki Ooi, George Ishikawa | 2007-05-15 |
| 7030973 | Polarization mode dispersion compensator based on degree of polarization | George Ishikawa, Takafumi Terahara, Hiroki Ooi | 2006-04-18 |
| 6865305 | Adaptively controllable polarization mode dispersion compensator | George Ishikawa | 2005-03-08 |