9 OPTICAL MEASUREMENT SYSTEMS COMPRISING OPTICAL ENERGY SOURCE OPTICAL RECEIVER, AND SPECTRUM ANALYZER; SIGNAL ENCODER/DECODERS, LASERS, OPTICAL FIBER SLEEVES, OPTICAL FIBER ASSEMBLY TRESTLES, OPTICAL FIBER TERMINAL DISTRIBUTION BOXES, OPTICAL TRANSMITTERS AND RECEIVERS, OPTICAL FIBERS, OPTICAL SWITCHES, OPTICAL CONNECTORS, OPTICAL FILTERS, OPTICAL MULTIPLEXERS AND DEMULTIPLEXERS, OPTICAL STAR COUPLERS, OPTICAL ATTENUATORS, AND PARTS FOR ALL THE FOREGOING