Issued Patents All Time
Showing 26–50 of 62 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6701033 | Optical switch element and wavelength router | — | 2004-03-02 |
| 6665467 | Optical wavelength filter | — | 2003-12-16 |
| 6657771 | Optical switch having optical deflector | — | 2003-12-02 |
| 6591036 | Optical multiplexing/demultiplexing device | — | 2003-07-08 |
| 6574392 | Wavelength router | — | 2003-06-03 |
| 6553164 | Y-branch waveguide | Hideki Ono | 2003-04-22 |
| 6553162 | Optical multiplexer-demultiplexer with mutually intersecting sub-gratings | — | 2003-04-22 |
| 6507690 | Optical device | — | 2003-01-14 |
| 6496614 | Light multiplexing wave division device | — | 2002-12-17 |
| 6496613 | Wavelength router | — | 2002-12-17 |
| 6493481 | Optical switch unit | Takayuki Kakinuma, Haruo Mori | 2002-12-10 |
| 6470112 | Lightwave system | — | 2002-10-22 |
| 6456764 | Optical directional coupler | — | 2002-09-24 |
| 6427037 | Two-stage optical switch circuit network | — | 2002-07-30 |
| 6374018 | Optical switch, method of operating optical switch, and method of designing optical switch | — | 2002-04-16 |
| 6320998 | Optical switch for selectively connecting an optical input terminal with an optical output terminal | Hironori Sasaki | 2001-11-20 |
| 6272270 | Optical wave combining/splitting device | — | 2001-08-07 |
| 6229943 | Optical circuit device and wavelength router | — | 2001-05-08 |
| 6215922 | Lightwave filter and lightwave selective router | — | 2001-04-10 |
| 6154587 | Optical cross connector apparatus | — | 2000-11-28 |
| 6097517 | Wavelength router | — | 2000-08-01 |
| 5973809 | Multiwavelength optical switch with its multiplicity reduced | — | 1999-10-26 |
| 5946129 | Wavelength conversion apparatus with improved efficiency, easy adjustability, and polarization insensitivity | Chang Qing Xu, Keisuke Shinozaki | 1999-08-31 |
| 5786916 | Optical-wavelength interchanger element and optical-wavelength interchanger device | Chang Qing Xu | 1998-07-28 |
| 5734494 | Wavelength conversion device and wavelength conversion method | Chang Qing Xu | 1998-03-31 |