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The authors propose an improved near-field scanning system for measuring the mode distribution exiting a multimode fibre (MMF), notably for evaluating conformity to the encircled flux (EF) standard of a measurement source used for MMF loss/attenuation characterisation. This system offers advantages over both charge coupled device (CCD)-based and traditional scanning approaches. EF measurements taken...
An ongoing problem in any network finds craft personnel opening incorrect optical circuits for diagnosis. We demonstrate an instrument that non-intrusively induces a time-varying loss on optical fibers, thereby uniquely identifying specific circuits.
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