Fig. 1. Framework of NG-PON2 Fronthaul I network employing EMRC-Rx and Si modulator

Fig. 2. Working principle of the system. (a) Working principle of uplink and downlink signal transmission of PON system employing EMRC-Rx and Si modulator; (b) corresponding spectrum of each part and PD internal beat frequency spectrum

Fig. 3. Experiment setup. (a) Confirmatory experimental device with Si modulator and EMRC-Rx; (b) DSP of the QPSK transmitter, DD-Rx, Lite CO-Rx #1, and Lite CO-Rx #2

Fig. 4. Si MZM chip diagram

Fig. 5. Device characterization setup. (a) Bandwidth (S21) testing link of Si modulator; (b) SFDR testing link of Si modulator

Fig. 6. Device performance characterization results. (a) S21 response of the Si MZM at different reverse bias voltages; (b) test result of SHD and IMD3

Fig. 7. Frequency spectrum captured by oscilloscope after PD

Fig. 8. Measured BERs and constellations for DD-Rx, Lite CO-Rx #1, Lite CO-Rx #2, and EMRC-Rx in the case of BTB

Fig. 9. Measured EVM varing with the frequency interval between the downstream signal and upstream LO for the DD-RX, Lite CO-Rx #1, Lite CO-Rx #2, and EMRC-Rx

Fig. 10. Received sensitivity of the DD-Rx, Lite CO-Rx #1, and EMRC-Rx varing with the fiber optic transmission distance at different BERs, curve coincidence of MRC-Rx and Lite CO-Rx #1 in Fig.10(a). (a) HD-FEC threshold; (b) 1.0×10^-4

Fig. 11. Measured BER of DD-Rx, Lite CO-Rx #1, MRC-Rx, and EMRC-Rx with Si MZM and LN MZM

Fig. 12. System SSBI analysis. (a) Generation principle of SSBI; (b) impact of SSBI in the proposed system