9 OPTICAL TELECOMMUNICATION MACHINES AND APPARATUS, NAMELY, SEMICONDUCTOR LASER DEVICES, SEMICONDUCTOR LASER MODULES; SEMICONDUCTOR DEVICES AND MODULES FOR TELECOMMUNICATIONS COMPRISED OF ONE OR MORE OF THE FOLLOWING COMPONENTS; FIBER-OPTIC AMPLIFIERS, ARRAYED WAVEGUIDE GRATINGS, SEMICONDUCTOR LASERS AND INSTRUMENTS; SEMICONDUCTOR DEVICES, SPLITTERS, COUPLERS, PUMP LASERS, LASERS, SOURCE LASERS, DETECTORS, MODULATORS, FIBER BRAGG GRATINGS, FIBER COUPLERS, FILTERS, ATTENUATORS, ISOLATORS, CIRCULATORS-GAIN EQUALIZERS; AMPLIFIERS; MULTIPLEXERS; DEMULTIPLEXERS; ADD-DROP MODULES, SWITCHES, HYBRID MODULES, SIGNAL LASERS, TUNABLE LASERS