Patent ID: 6952506

Claim:
A device for adding and dropping optical signals comprising: an optical signal provided at an end unit of a free space wherein optical signals proceed in the device, for injecting/transmitting optical signals corresponding to multi-wavelengths, and adding/dropping optical signals corresponding to predetermined wavelengths; a bulk dielectric optical thin film provided in the free space, for reflecting or transmitting the optical signals corresponding to the predetermined wavelengths from among the multi-wavelengths injected/added by the optical signal processor, transmitting or reflecting the optical signals corresponding to other wavelengths to add and drop the optical signals corresponding to the predetermined wavelengths; first and second focusing lenses for focusing the optical signals injected/added by the optical signal processor to allow them to proceed to the bulk dielectric optical thin film, focusing the optical signals passed through the bulk dielectric optical thin film to drop/transmit them to the optical signal processor; and first and second collimating lenses respectively provided between the bulk dielectric optical thin film and the first focusing lens, and between the bulk dielectric optical thin film and the second focusing lens, for allowing the optical signals focused at the first and second focusing lenses to proceed in parallel, and be provided to the bulk dielectric optical thin film, and collimating the signals passed through the bulk dielectric optical thin film to allow the signals to proceed to the focusing lenses.