Yan Fu

25Gbps two-dimensional trellis coded PAM4 TDM-PON transmission based on 10G optics

We demonstrate an alternative approach to 25Gbps 2D TCM PAM4 for TDM-PON with 10GHz optics, which employs M-algorithm at its decoder. Compared to PAM4, 2D TCM PAM4 brings the power budget up by ∼3dB with low complexity.

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.

Spectral Efficiency Improved 2D-PAM8 Trellis Coded Modulation for Short Reach Optical System

This paper proposes and demonstrates a 31.25xa0Gbps two-dimensional eight level pulse amplitude modulation with trellis coded modulation (2D-PAM8-TCM) transmission in intensity modulation and direct detection based short reach system. In this system, the commercial directly modulated laser and photodiode with trans-impedance amplifier (PIN-TIA) with a combined modulation bandwidth of ∼16 GHz are used as transmitter and receiver, respectively. For 2D-PAM8-TCM signals, except for regular 8-state convolutional encoder, both 16-state and 32-state encoders are provided. Considering the coding gain and the complexity of convolutional encoder, the 16-state one is recommended. Moreover, instead of Viterbi decoder, the M-algorithm is utilized at the receiver side to reduce decoder complexity. It is experimentally demonstrated that 2D-PAM8-TCM scheme can achieve 2.5 b per symbol and ∼0.5 dB sensitivity improvement (bit error rate @

Multi-Dimensional Coded PAM4 Modulation for TDM-PON based on 10G Optical Devices

3.8 times {10^{ - 3}}

High-fidelity and low-latency mobile fronthaul based on segment-wise TDM and MIMO-interleaved arraying

) over a 20 km standard single mode fiber in comparison with conventional PAM4. Thanks to no additional digital signal processing in receiver side except M-algorithm, this scheme is simple and effective, which can be considered as an attractive technique for future short reach system.

SINR-oriented flexible quantization bits for optical-wireless deep converged eCPRI

We demonstrate an alternative approach of 12.5 GBaud 2D coded PAM4 for TDM-PON with 10 GHz DML and 10 GHz PIN-TIA. Compared with PAM4, 2D coded PAM4 shows superiority in power budget with low complexity.