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| Number | Title | Issue Date |
| 6810182 | Optical tunable grid-assisted add/drop filter in codirectional mode of operation A tunealble optical grid-assisted add/drop filter for codirectional operational mode consisting of at least two waveguides composed of two different classes of material of different optical parameters. The thermal refractive index coefficient dn/dT, the electro-opti... | 10/26/2004 |
