Issued Patents 2003
Showing 1–5 of 5 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6654561 | Method and apparatus for measuring optical signal-to-noise ratio, and pre-emphasis method and optical communication system each utilizing the method | Takafumi Terahara, Takeshi Sakamoto, Hiroaki Tomofuji, Motoyoshi Sekiya, Makoto Murakami +1 more | 2003-11-25 |
| 6583900 | Optical transmission apparatus, optical transmission system, and optical terminal station | Hideyuki Miyata, Kazue Otsuka, Yutaka Kai, Tadao Nakazawa, Terumi Chikama | 2003-06-24 |
| 6570699 | Variable optical attenuator which applies a magnetic field to a Faraday element to rotate the polarization of a light signal | Nobuhiro Fukushima | 2003-05-27 |
| 6545784 | Optical cross connect unit, optical add-drop multiplexer, light source unit, and adding unit | Kazue Okazaki, Hideyuki Miyata, Yutaka Kai, Terumi Chikama | 2003-04-08 |
| 6538782 | Light branching/inserting apparatus and light branching apparatus using wavelength selection filter | Kazue Otsuka, Terumi Chikama | 2003-03-25 |