Issued Patents All Time
Showing 76–83 of 83 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6317538 | Optical waveguide device and optical device having long-period grating | Masakazu Shigehara, Masayuki Shigematsu | 2001-11-13 |
| 6246512 | Optical amplifier | — | 2001-06-12 |
| 6243196 | Optical fiber for optical amplifier and fiber optic amplifier | Shinji Endo, Shinji Ishikawa | 2001-06-05 |
| 6144784 | Optical input/output module and light-reflecting device | Masakazu Shigehara, Shinji Ishikawa, Hiroo Kanamori, Masayuki Nishimura | 2000-11-07 |
| 6104526 | Optical amplifier and a method of controlling the optical amplifier | — | 2000-08-15 |
| 5900970 | Optical filter and optical transmission system having the same | — | 1999-05-04 |
| 5835259 | Optical fiber amplifier | Masayuki Shigematsu | 1998-11-10 |
| 5742427 | Optical fiber amplifier | Masayuki Shigematsu | 1998-04-21 |