[Telecommunications apparatus and instruments, namely, telecommunications switches, dispersion-compensation modules for use in telecommunications networks; optical demultiplexors, optical multiplexors, add-drop multiplexors; optical and/or optoelectronic apparatus and instruments,], namely, fiber-optic light and image conduits and fiber-optic cables, [optical couplers, optical switches, mode filters, polarisers, mode-field converters, pulse compressors, wavelength converters, amplifiers, Rama...