Issued Patents 2004
Showing 1–4 of 4 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6829407 | Planar optical circuit and optical transmission system | — | 2004-12-07 |
| 6819859 | Planar lightwave circuit type variable optical attenuator | Chisai Hirose | 2004-11-16 |
| 6782168 | Apparatus for and method of monitoring wavelength multiplexed signal light as well as optical transmission system using the same | Chisai Hirose, Masayuki Nishimura | 2004-08-24 |
| 6701090 | Wavelength division multiplexing signal number monitoring apparatus and method | Eisuke Sasaoka | 2004-03-02 |