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fiber optic components, namely splitters, combiners, couplers, tap/drop-offs, star couplers, multi/demultiplexers, wavelengh division multi/demultiplexers, frequency division multi/demultiplexers, thermo-optic switches, optical interconnects, interferometers, optical delay lines, optical signal processors, arrayed waveguide gratings, filters, ring resonators, waveguide optical amplifiers, optical printed circuit boards and planer waveguides