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We demonstrate a radiation mode coupler based on a tilted fiber Bragg grating that spatially demultiplexes different modes in a few-mode fiber. The observed radiation patterns match well with those theoretically predicted using the volume current method. The correlations in measured relative modal weights obtained from this device and an accurate interferometric measurement used as a reference, suggest...
We demonstrate a sidetap modal channel monitor based on a tilted Bragg grating, where different modes radiate at different angles. We qualitatively correlate the observed modal power partitioning with more accurate interferometer-based measurements.
We demonstrate an all-fiber method to generate a 28um × 6.5um optical bottle using coherent superpositions of fiber-grating-based Bessel beams. Our method enables precise beam control by tuning the relative modal weight and phase of the two beams.
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