A reconfigurable Photonic Integrated Circuit for mode multiplexing and demultiplexing in a few-mode fiber is proposed and demonstrated. The circuit allows to selectively excite and demultiplex modes LP10 and LP11a with an estimated efficiency in the order of -6 dB and modedependent losses smaller than 1 dB. Mode cross-talk is measured as low as -20 dB. Two-mode SDM fiber transmission and channel routing reconfiguration are demonstrated exploiting exclusively integrated circuits for mode coupling and demultiplexing.