Spatial mode analysis of an elliptical-core, few-mode, optical fiber for MIMO-less space-division-multiplexing

We measure the mode coupling matrix for a 0.5km elliptical-core few-mode fiber supporting six spatial modes (HG<sub>00</sub>, HG<sub>01</sub>, HG<sub>10</sub>, HG<sub>02</sub>, HG<sub>20</sub>, and HG<sub>11</sub>) at 980nm. We demonstrate low crosstalk <;-16dB between any pairs of modes even under severe bending. EC-FMFs are suitable for short-reach MIMO-less transmission.

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