Issued Patents All Time
Showing 1–25 of 33 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 10230462 | Optical transmission characteristic measurement device and method | Shoichiro Oda, Toru Katagiri, Masatake Miyabe, Yasuhiko Aoki | 2019-03-12 |
| 10020878 | Optical signal-to-noise ratio monitor and method for measuring optical signal to-noise ratio | Shoichiro Oda, Yasuhiko Aoki, Hiroki Oi, Yoichi Akasaka, Jeng-Yuan Yang | 2018-07-10 |
| 9813183 | Optical transmission device and optical transmission system | Kentaro Nakamura, Yoshito Kachita, Yusaku Yamamoto | 2017-11-07 |
| 9698902 | Optical transmission system and optical transmission device | Kentaro Nakamura, Yasushi Sugaya | 2017-07-04 |
| 9673929 | Optical transmission apparatus and optical transmission system | Makoto Yamashita, Masahiro Yuki | 2017-06-06 |
| 9515733 | Mitigation of spectral offset in an optical filter | Youichi Akasaka, Jeng-Yuan Yang, Motoyoshi Sekiya, Hiroki Ooi, Takuji Maeda | 2016-12-06 |
| 9515727 | In-band optical signal-to-noise ratio monitor | Jeng-Yuan Yang, Youichi Akasaka, Motoyoshi Sekiya, Takuji Maeda, Hiroki Ooi | 2016-12-06 |
| 9391421 | Optical amplification apparatus, optical transmission apparatus, and optical transmission system | Yoshito Kachita | 2016-07-12 |
| 9270369 | Correction table for interferometric optical signal-to-noise ratio monitor | Jeng-Yuan Yang, Youichi Akasaka, Motoyoshi Sekiya, Takuji Maeda, Hiroki Ooi +1 more | 2016-02-23 |
| 9112605 | Dual-polarization interferometric optical signal-to-noise ratio monitor | Jeng-Yuan Yang, Youichi Akasaka, Motoyoshi Sekiya, Takuji Maeda, Hiroki Ooi | 2015-08-18 |
| 9077475 | Optical packet switching system and method for controlling the peak power | Tatsuhiko Saito, Koji Bato | 2015-07-07 |
| 8615167 | WDM optical transmission system and control method thereof | Yasushi Sugaya, Takehiro Fujita | 2013-12-24 |
| 7650072 | Method of upgrading optical node, and an optical node apparatus | Miki Onaka, Yasushi Sugaya, Takahumi Terahara, Takehiro Fujita, Hiroaki Tomofuji +1 more | 2010-01-19 |
| 7619813 | Wavelength division multiplexing device, an optical leakage prevention method, and a wavelength division multiplexing communication system | Taizo Maeda, Takehiro Fujita | 2009-11-17 |
| 7542677 | Dispersion compensation method in optical communication system having optical add drop multiplexing capability | Motoyoshi Sekiya, Kazuo Yamane, Ryosuke Goto, Takehito Okeno | 2009-06-02 |
| 7522839 | Method of upgrading optical node, and an optical node apparatus | Miki Onaka, Yasushi Sugaya, Takahumi Terahara, Takehiro Fujita, Hiroaki Tomofuji +1 more | 2009-04-21 |
| 7376361 | Optical transmission system and dispersion compensator | Akira Miyauchi, Kazuo Yamane, Yumiko Kawasaki | 2008-05-20 |
| 7274878 | Dispersion compensation method in optical communication system having optical add drop multiplexing capability | Motoyoshi Sekiya, Kazuo Yamane, Ryosuke Goto, Takehito Okeno | 2007-09-25 |
| 7263296 | Optical transmission system using in-line amplifiers | Akira Miyauchi, Kazuo Yamane, Yumiko Kawasaki | 2007-08-28 |
| 7116913 | Optical transmission system and dispersion compensator | Akira Miyauchi, Kazuo Yamane, Yumiko Kawasaki | 2006-10-03 |
| 7116918 | Optical transmission system using in-line amplifiers | Akira Miyauchi, Kazuo Yamane, Yumiko Kawasaki | 2006-10-03 |
| 7079771 | Wavelength multiplexing transmission apparatus and wavelength demultiplexing reception apparatus | Kazuo Yamane, Takashi Tsuda, Yumiko Kawasaki | 2006-07-18 |
| 7068876 | Method and system for optical transmission adopting dispersion compensation | Takashi Tsuda, Kazuo Yamane, Yumiko Kawasaki | 2006-06-27 |
| 7006769 | Method for optical fiber communication, and device and system for use in carrying out the method | Yumiko Kawasaki, Kazuo Yamane, Takashi Tsuda | 2006-02-28 |
| 6823141 | Optical transmission system and dispersion compensator | Akira Miyauchi, Kazuo Yamane, Yumiko Kawasaki | 2004-11-23 |