Issued Patents All Time
Showing 1–12 of 12 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 12372721 | Depolarizer and optical amplifier excitation apparatus | Hiroto Kawakami, Yoshiaki Kisaka | 2025-07-29 |
| 11822161 | Bias voltage adjustment apparatus and IQ optical modulation system | Hiroto Kawakami, Yoshiaki Kisaka | 2023-11-21 |
| 11711151 | Optical transmission system and compensation method | Asuka Matsushita, Masanori Nakamura, Kengo Horikoshi, Yoshiaki Kisaka | 2023-07-25 |
| 11711198 | Synchronous detection apparatus, synchronous detection method, and program | Hiroto Kawakami, Yoshiaki Kisaka | 2023-07-25 |
| 11397363 | Automatic bias control circuit | Hiroto Kawakami, Yoshiaki Kisaka, Masanori Nakamura | 2022-07-26 |
| 10823989 | Bias control circuit and bias control method | Hiroto Kawakami, Akira Hirano | 2020-11-03 |
| 10313015 | Optical transmitter and bias voltage control method | Hiroto Kawakami, Akira Hirano | 2019-06-04 |
| 8005374 | Optical transmission system, optical transmitter for optical transmission system, and optical receiver for optical transmission system | Kazushige Yonenaga, Mikio Yoneyama, Masahito Tomizawa, Akira Hirano, Tomoyoshi Kataoka +2 more | 2011-08-23 |
| 7995930 | Optical receiver using Mach-Zehnder interferometer | Mikio Yoneyama, Fumiaki Saitou, Shigeru Ono, Yosuke Takeuchi, Kazushige Yonenaga +3 more | 2011-08-09 |
| 7734194 | Optical transmission system, optical transmitter for optical transmission system, and optical receiver for optical transmission system | Kazushige Yonenaga, Mikio Yoneyama, Masahito Tomizawa, Akira Hirano, Tomoyoshi Kataoka +2 more | 2010-06-08 |
| 7536108 | High precision chromatic dispersion measuring method and automatic dispersion compensating optical link system that uses this method | Akira Hirano, Yutaka Miyamoto, Masahito Tomizawa, Hiroshi Takahashi, Yasuyuki Inoue | 2009-05-19 |
| 7116917 | Optical transmitter and optical transmission system | Yutaka Miyamoto, Akira Hirano, Masahito Tomizawa | 2006-10-03 |