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

Abstract

We designed and built a new type of spatial mode multiplexer, based on Multi-Plane Light Conversion (MPLC), with very low intrinsic loss and high mode selectivity. In this first demonstration we show that a typical 3-mode multiplexer achieves a mode selectivity better than -23 dB and a total insertion efficiency of -4.1 dB (optical coating improvements could increase efficiency to -2.4 dB), across the full C-band. Moreover this multiplexer is able to perform any mode conversion, and we demonstrate its performance for the first 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${}_{21\mathrm{b}}$.

References in corpus (2)

• Space Division Multiplexing in Optical Fibres
• Programmable unitary spatial modes manipulation

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