Issued Patents All Time
Showing 1–17 of 17 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 8725006 | Digital signal-to-signal beat noise reduction for filter-less coherent receiving system | Yue-Kai Huang, Ezra Ip, Dayou Qian, Philip Nan Ji, Yoshiaki Aono | 2014-05-13 |
| 8718474 | Chromatic dispersion compensation using sign operations and lookup tables | Dayou Qian, Junqiang Hu, Ting Wang, Yoshiaki Aono | 2014-05-06 |
| 8391706 | Optical signal division transmission system, optical transmitter, optical receiver, and optical signal division transmission method | Keiichi Yamada | 2013-03-05 |
| 8218977 | Integrated equalizer and Michelson interferometer structure for inter-symbol interference-suppressed colorless DPSK demodulation | Philip Nan Ji, Lei Xu, Ting Wang, Shuji Murakami, Yutaka Yano | 2012-07-10 |
| 8064768 | Intra-channel equalizing optical interleaver | Philip Nan Ji, Lei Xu, Ting Wang, Shuji Murakami, Yutaka Yano | 2011-11-22 |
| 7920559 | Transponder, transmission system, transmission method and transmission program | Naoya Shiota, Daisuke Uehara | 2011-04-05 |
| 6522675 | Wavelength control circuit and wavelength control method of light emitting device | — | 2003-02-18 |
| 6420962 | AUTOMATIC IDENTIFICATION LEVEL CONTROL CIRCUIT, IDENTIFICATION LEVEL CONTROL METHOD, AUTOMATIC IDENTIFICATION PHASE CONTROL CIRCUIT, IDENTIFICATION PHASE CONTROL METHOD, OPTICAL RECEIVER, AND OPTICAL COMMUNICATION SYSTEM | Yoshihiro Matsumoto, Takashi Kuriyama, Yoshinori Honma, Masashi Tachigori, Toshibumi Kawano +3 more | 2002-07-16 |
| 6081359 | Transmitting apparatus and receiving apparatus for wavelength-division-multiplex signal transmission | Tsukasa Takehana | 2000-06-27 |
| 6055093 | Optical amplifying apparatus and linear relay optical amplifier transmitter | Tadayuki Chikuma | 2000-04-25 |
| 5995276 | Wavelength-division-multiplexing optical amplifier device and wavelength-division-multiplexing optical transmission system | Tadayuki Chikuma | 1999-11-30 |
| 5926304 | Optical fiber amp repeater of amplifying an optical signal and superimposing an auxiliary signal | — | 1999-07-20 |
| 5768000 | Wavelength multiplexing optical transmission device | — | 1998-06-16 |
| 5726794 | DC bias controller for optical modulator | — | 1998-03-10 |
| 5367397 | Wavelength-stabilizing method and its associated circuitry for an optical communication system | — | 1994-11-22 |
| 4864649 | Driver circuit for driving a light emitting element by superimposing an analog sub-information signal over a digital main signal | Toru Hamanaka | 1989-09-05 |
| D296691 | Megaphone | — | 1988-07-12 |