UNIAXIS AND MULTIAXIS ADJUSTING AND POSITIONING APPARATUS WITH PIEZOELECTRIC DRIVES, NAMELY PIEZOELECTRIC TILTING PLATFORMS FOR OPTICAL ELEMENTS AND ACTIVE OPTICAL SYSTEMS; DATA PROCESSING DEVICES, NAMELY, COMPUTER HARDWARE; COMPUTER HARDWARE AND COMPUTER OPERATIONS SOFTWARE FOR ADJUSTING AND POSITIONING APPARATUS; ENCAPSULATED AND NON-ENCAPSULATED PIEZOELECTRIC MULTILAYER ACTUATORS; PIEZOELECTRIC ULTRASOUND CONVERTERS, MULTIMODE COMPUTER NETWORK SWITCHES FOR OPTICAL WAVE GUIDES