Scientific, optical, measuring, signalling and control apparatus and instruments; optical glass; measuring glasses; optical data media; optical fibre cables; optical fibers [light conducting filaments]; optical active fibers; fiber laser; fiber amplifier [optical amplifier]; planar waveguides; integrated optics (circuits); micro-optical and nanooptical components; optical tapers; fiber couplers [optical couplers]; fiber-optic sensors; optical measuring apparatus and instruments and installati...