Longsheng Li

High accuracy and non-pilot aided sampling frequency offset estimation algorithm in Multi-IFoF fronthaul

We propose a non-pilot aided sampling frequency offset (SFO) estimation algorithm in Multi-IFoF fronthaul with estimation error below 12ppb under SFO range from −100ppm to 100ppm and high robustness at received optical power as low as − 27dBm.

Experimental Study of NRZ, Duobinary, and PAM-4 in O-Band DML-Based 100G-EPON

We investigate the transmission performance of 28-Gb/s nonreturn-to-zero on-off keying (NRZ-OOK), duobinary, and four-level pulse amplitude modulation signals over different fiber lengths without any inline amplification or pre/ post-processing digital signal processing technique by utilizing an O-band 18G-class directly modulated laser (DML). By experiment, it is verified that negligible sensitivity penalty is introduced by DML chirp effect after fiber transmission, which is due to the extremely low dispersion of O-band wavelengths. Meanwhile, the results indicate that NRZ-OOK outperforms the other two formats in receiver sensitivity, and for 20-km transmission, a power budget of 25.5 dB is achieved without pre-amplification. According to the experimental results, O-band DML-based NRZ-OOK transmission is a cost-effective solution for future 100G-EPON.

Experiment Demonstration of Optical Fronthaul Transmission System based on Power Division Multiplexing for Future 5G Scenarios

In this letter, we propose an analog RoF fronthaul scheme based on power division multiplexing for the purpose of enlarging the massive terminal devices access and transmission capacity for future 5G mobile system. By experiment, transmission of 20MHz bandwidth PDM-OFDM signal is verified in BtB and 20-km SSMF cases.