Digital coherent receiver for subcarrier multiplexed phase-modulated radio-over-fibre signals
Digital coherent detection of multi-channel subcarrier multiplexed optically phase-modulated radio-over-fibre signals is experimentally demonstrated. Successful detection after transmission over a 40 km-long fibre link of four or five 25 Mbaud BPSK/QPSK subcarrier channels in 5 GHz bandwidth is demonstrated using offline digital signal processing.