Demonstrated is a super resolution, low loss, 100% repeatable and fast response digital variable fiber-optic attenuator instrument using a digital micromirror device. The attenuator design exploits beam expansion optics and a retroreflective architecture to achieve super-resolution with digital repeatability. The proof-of-concept attenuator at demonstrates a optical attenuation range, optical insertion loss of , a maximum attenuation reset time, an optical polarization dependant loss of less than , and an optical resolution range of . The demonstrated attenuator is appropriate for fiber-optic test and instrumentation applications.
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