Joint Transmission and Sensing in Few-Mode Fibre

We experimentally demonstrate the coexistence of transmission and sensing using an innovative commercial 15-mode few-mode fibre system. With respect to previous works where the cascade of single-few-single mode fibres has been used, our system features a mode multiplexer and demultiplexer. By transmitting a telecommunication signal over the fibre fundamental mode, the sensing capabilities of the few-mode fibre are demonstrated analysing the power variation of the higher-order modes directly excited by the fundamental mode itself owing to the intermodal crosstalk perturbation.