Optical fibers; electric wires and cables; optical amplifiers; optical apparatuses and instruments, namely, blank optical discs, blank recordable optical discs, filters for optical devices, optical cables, optical disk drives, eyeglasses, sunglasses, optical lenses, optical frames, light sources for optical fiber sensing systems, gyroscopes, high precision optical measurement systems and cross-sectional imaging systems; optical fiber endoscopes for non-medical use; and telecommunication devic...