FIBER OPTICS APPARATUS, EQUIPMENT, INSTRUMENTS AND COMPONENTS, NAMELY, OPTICAL FIBER COUPLERS, FUSED TAPERED COUPLERS, FUSED TAPERED Y-JUNCTIONS, [ FUSED POLISHED COUPLERS, FUSED POLISHED POLARIZATION MAINTAINING FIBER COUPLERS, FUSED MONOLITHIC COUPLERS, DIFFUSED CORE SPLICES, FIBER POLARIZING BEAMSPLITTERS AND COMBINERS, ] OPTICAL SENSORS; [ MINIATURE TAPERED LOOPS AND MONOLITHIC MACH-ZEHNDER SUBSTRATES FOR THE MANUFACTURE OF ULTRA-STABLE DENSE WAVELENGTH DIVISION MULTIPLEXORS (WDMS); ELECT...