Issued Patents All Time
Showing 26–50 of 86 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 9244328 | Optical modulator and optical modulation control method | Hiroshi Kuwahara | 2016-01-26 |
| 9166841 | Receiving apparatus and receiving method | Fumihiro Hasegawa | 2015-10-20 |
| 9143273 | Multi-level differential decoding device and method for quadrature amplitude modulation communication system | Takashi Sugihara, Tsuyoshi Yoshida | 2015-09-22 |
| 9069224 | Optical modulator and optical modulation control method | Hiroshi Kuwahara | 2015-06-30 |
| 8914715 | Soft decision value generation circuit to reduce calculation amounts and hardware scale | Akira Kurita | 2014-12-16 |
| 8903239 | Optical modulator and optical modulation control method | Hiroshi Kuwahara | 2014-12-02 |
| 8824446 | Wireless communication system, transmission device, and receiving device | Tomoya Yamaoka, Hiroshi Kubo | 2014-09-02 |
| 8811821 | Optical transmitter, optical transmission method, and transmission/reception system | — | 2014-08-19 |
| 7929862 | Optical transmission system and optical transmission method | Katsuhiko Hakomori, Akihiko Ichikawa | 2011-04-19 |
| 7443341 | Method for deriving weight vectors to be used at the time of transmitting signals from a plurality of antennas, and transmitting apparatus and communication system utilizing said method | Seigo Nakao, Yasutaka Ogawa, Takeo Ohgane, Toshihiko Nishimura | 2008-10-28 |
| 7103283 | Transmission characteristic compensation control system | Satoshi Mikami, Kouichi Sawada | 2006-09-05 |
| 6904548 | Transmission characteristic compensation scheme | Masaaki Hashida | 2005-06-07 |
| 6871024 | Dispersion compensating method, dispersion compensating apparatus and optical transmission system | Satoshi Mikami | 2005-03-22 |
| 6449074 | Optical transmission device and optical communication system | Satoru Okano, Kazuo Yamane, Takashi Tsuda, Yumiko Kawasaki | 2002-09-10 |
| 6288836 | Optical amplifier and optical communication system having the optical amplifier | Yumiko Kawasaki, Satoru Okano, Kazuo Yamane, Takashi Tsuda | 2001-09-11 |
| 6124080 | Method of manufacturing an optical device with a groove accurately formed | Satoru Mizuta | 2000-09-26 |
| 6118564 | Optical time division demultiplexing apparatus and demultiplexed signal switching method as well as optical time division multiplex transmission system | Hiroki Ooi, George Ishikawa | 2000-09-12 |
| 6108480 | Optical device with a groove accurately formed | Satoru Mizuta | 2000-08-22 |
| 6055094 | Optical amplifying apparatus | Michikazu Shima | 2000-04-25 |
| 6038063 | Optical amplifier and optical transmission system including the optical amplifier | Takashi Tsuda, Kazuo Yamane, Yumiko Kawasaki, Satoru Okano | 2000-03-14 |
| 5991477 | Optical transmission system, optical multiplexing transmission system, and related peripheral techniques | George Ishikawa, Hiroki Ooi, Motoyoshi Sekiya, Hiroaki Tomofuji | 1999-11-23 |
| 5961683 | Method of manufacturing an optical device with a groove accurately formed | Satoru Mizuta | 1999-10-05 |
| 5926297 | Optical modulating device and optical modulating method | George Ishikawa, Hiroki Ooi | 1999-07-20 |
| 5917637 | Method of and device for driving optical modulator, and optical communications system | George Ishikawa | 1999-06-29 |
| 5917628 | Optical time-division multiplexer capable of supplying stable output signal | Hiroki Ooi, George Ishikawa | 1999-06-29 |