Fig. 4

Experimental setup for demonstration of mm-wave ARoF fronthaul with real-time processing of an 800 MHz wide 5G NR signal and a remote-fed LO. CO: central office, RU: remote unit, ARoF: analog radio-over-fiber, SDM: space division multiplexing, ODN: optical distribution network, 5G NR: 5G new radio, FR2: 5G NR frequency range 2, RF: radio frequency, IF: intermediate frequency, BB: baseband, BBU: baseband unit, DSP: digital signal processing, PRBS: pseudo random bit sequence, BERT: bit error rate tester, OFDM: orthogonal frequency division multiplexing, DAC: digital to analog converter, ADC: analog to digital converter, LO: local oscillator, MZM: Mach-Zehnder modulator, EDFA: erbium-doped fiber amplifier, MCF: multi-core fiber, HPF: high-pass filter, PA: power amplifier, MPA: medium power amplifier, LNA: low-noise amplifier