Dense wavelength-division mulitplexed (DWDM) optical switching unit comprised of optical and electronic hardware and control software for use in switching and routing of optical wavelengths in fiber optic transission networks

Optical add/drop multiplexers and optical switches for use in wavelength division multiplexed optical communication systems, computer hardware used in connection with such optical add/drop multiplexers and switches, and computer software used to control and monitor optical add/drop multiplexers and switches, and instructional manuals sold therewith as a unit