telecommunications equipment, namely, optical transmission, receiving and networking equipment, namely, switches, transmitters, receivers, multiplexers and demultiplexers, add/drop multiplexers, bragg gratings used to split and recombine light in dense wavelength division multiplexing systems, routers, cross-connects for selectively passing optical signals between multiple optical fibers, amplifiers, and regenerators, and optical network and element management, planning, and interface softwar...