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We designed and built a new type of spatial mode multiplexer, based onMulti-Plane Light Conversion (MPLC), with very low intrinsic loss and high modeselectivity. In this first demonstration we show that a typical 3-modemultiplexer achieves a mode selectivity better than -23 dB and a totalinsertion efficiency of -4.1 dB (optical coating improvements could increaseefficiency to -2.4 dB), across the full C-band. Moreover this multiplexer isable to perform any mode conversion, and we demonstrate its performance for thefirst 6 eigenmodes of a few-mode fiber: LP$_{01}$, LP$_{11\mathrm{a}}$,LP$_{11\mathrm{b}}$, LP$_{02}$, LP$_{21\mathrm{a}}$ and LP$_{21\mathrm{b}}$.

Efficient and mode selective spatial mode multiplexer based on Multi-Plane Light Conversion